2269: in (18.3 mm) center-to-center. The 20 A plug has a blade rotated 90° (opposite blade from what would be the "line" blade on a 2-15 or 5-15 plug. This prevents accidental insertion of plugs into outlets that use different voltages), and the 6-20R receptacle has a T-shaped hole to accept both 6-15P and 6-20P plugs (similar to the 5-20R receptacle accepting 5-15P and 5-20P plugs). The 50 A (and 5-50) receptacles look like bigger versions of the 5-15 A. 6-15R and 6-20R receptacles are usually manufactured on the same assembly line as "Industrial" or "Commercial" grade 5-15R and 5-20R receptacles, with all 4 receptacles sharing the same "triple wipe" T contacts behind the varying faceplates. The faceplate bonded onto the receptacle determines the final configuration of the receptacle.
2062:
1967:
codes. In addition to the lack of grounding, these obsolete receptacles could allow a connected device to overheat and create a fire hazard if a device designed for the wrong voltage is connected. These problematic outlets are easily identifiable due to their lack of ground, along with both openings on the receptacle face being a sideways T-shaped opening that appear to be mirrored on the vertical center line of the face. Due to the potential danger of a voltage mismatch, whenever possible these receptacles should be replaced. Depending on local code, replacement with a "repair" approved non-grounded receptacle may be sufficient.
275:(NEMA) was founded by the merger of the Electric Power Club and the Associated Manufacturers of Electrical Supplies and represented manufacturing companies of the electrical segment in a national level. NEMA provided a forum between companies for reaching standardization, but it was not until the 1940s that NEMA started to publish standards on receptacles and plugs, much later than UK, France and Germany. Since NEMA was a forum between manufacturers and not an governmental body, any decision had to be thoroughly discussed and agreed upon by its members, which substantially slowed the standardization process.
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3363:[Harvey Hubbell Inc. V. General Electric Co. et.al. (262 Fed.Rep. 155) District Court of the United States, Southern District of New York, October 20, 1919. Reported in "The Trade Mark Reporter" Vol 10, 1920, Pages 164–175. The court observed that Hubbell's plugs were readily distinguishable from those of other makes by the provision of "nicks" in the pins of Hubbell's plug pins, designed to provide retention when mated with Hubbell's receptacles, so there was no confusion as to their origin. The report of the trial is available from Google Books here:
2979:
2025:
3045:
GFCI receptacles in that they have a "Test" and "Reset" button on the face of the device for localized testing. This saves a homeowner a trip to the breaker panel, should the device trip. Unlike AFCI breakers, AFCI receptacles can be used on any wiring system, regardless of the panel. When installed as the first receptacle on a branch circuit, AFCI receptacles can provide series arc protection for the entire branch circuit. They also provide parallel arc protection for the branch circuit downstream of the AFCI receptacle.
2941:
2038:
3116:. The device can be integral with the power plug, or a separate module within 12 inches of the plug. The protection device is equipped with "Test" and "Reset" buttons on the housing. An LCDI cord has a fine wire mesh around the conductors, and circuitry to detect current leaking from the conductors to the mesh, which would happen if the cord were damaged or frayed. The plugs are normal NEMA 5-15, 5-20, 6-15, 6-20, or 6-30 plugs, depending on the air conditioner design, and are typically molded-on designs.
2504:
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2186: in (12.7 mm) from the hot blade. The 5-20R receptacle has a T-shaped neutral hole, to accept both 5-15P and 5-20P plugs. An acceptable alternative version of the 5-20R receptacle has a rectangular slot that will only accept 5-20P plugs. The 5-30 and 5-50 are physically larger, with 1 in (25.4 mm) between power pins; 5-30 also has an L-shaped neutral blade. These larger sizes are uncommon, as twist-locking plugs are generally used for high-current applications.
169:, for a lightbulb socket adaptor and plug, also a standalone receptacle. The adaptor was screwed into the lightbulb socket, leaving a flat face with two holes to conveniently attach the plug. The same patent had a second design, with a wall attachable receptacle, capable of receiving the same plug, thus being the first socket and plug design patented in the US. Later in 1904, he changed the design to flat blades (a design later incorporated in the NEMA 2 series), filled under the
284:
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2754:
240 V 50 A service, and use a cord to connect to a receptacle at the campsite, usually on a power pedestal with one or more receptacles providing 120 V 30 A (TT30R), 240 V 50 A (14-50R), or 120 V 15/20 A (5-20R) service. Locking receptacles appropriate for the voltage and current are used on the RV end of the cord, along with non-locking plugs on the end connecting to the pedestal.
2105:
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2990:, and have "Test" and "Reset" buttons (and sometimes an indicator light which may be normally on or normally off per the vendor's design). In the US and Canada, GFCI protection is required for receptacles in many potentially wet locations, including outside outlets, bathrooms, and some places in kitchens, basements, and crawl spaces. This is an expedient way to provide that protection at the receptacle itself.
44:
1951: in or 1.6 mm wider than the line blade, so the plug can be inserted only one way. Polarized 1-15P plugs will not fit into unpolarized receptacles, which possess only narrow slots. Polarized 1-15P plugs will fit 5-15R grounded receptacles, which have the same wider slot for the neutral blade. Some devices that do not distinguish between neutral and line, such as internally isolated
52:
1846:(NECA 130-2010) specify that the preferred location of the ground is on top. When the ground blade of a receptacle is on the bottom, the neutral blade is on the upper left and the hot blade is on the upper right. All descriptions below assume this orientation (i.e., clockwise order is ground, neutral, hot for 120 V receptacle versions; and counter-clockwise for plug versions).
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2391:, and other high-power equipment. NEMA 14-30R and -50R connectors have generally replaced NEMA 10 equipment for these applications. NEMA 10s are classified as 125/250 V non-grounding (hot-hot-neutral), and were designed to be used in a manner that indirectly grounds the appliance frame to the neutral, which was common before the requirement of a separate
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3144:(IG) device, where the grounding pin of the receptacle is connected to ground independently of the frame of the receptacle and wiring outlet box. This is also a requirement of the National Electrical Code (NFPA 70), Article 406. While neither UL nor the CSA require the face of the receptacle to be a specific color, most IG receptacles are orange.
2024:
2236:, the name of a common manufacturer. (The name "Hubbell" can be confusing as several different connectors share this name depending on the company, industry, and use.) In the motion picture and TV production industries, an extension cord that uses this type of connector (usually with 12 AWG or 10 AWG wire) is called a "stinger". Generally,
3028:
fails to do so and therefore cannot make contact with the live electrical contacts. However, the device can still be defeated by inserting two objects simultaneously. Despite its weaknesses, the tamper-resistant receptacle is superior to protective plastic outlet caps which must be individually installed on each receptacle (and are a
2447:. The 14-30 is limited to 30 amperes (24 amperes continuous) and used mainly for some electric clothes dryers and some electric cooking stoves. The NEMA 14 connectors are essentially the replacements for the older NEMA 10 connectors described above, but with the addition of a dedicated grounding connection.
2997:. Installing a single receptacle is often cheaper or more convenient than providing this GFCI protection at the circuit breaker. In addition, a tripped GFCI receptacle may be more easily noticed and reset, as compared to a tripped GFCI located in a remote circuit breaker panel far from the point of usage.
2399:
to break, disconnect, or develop high resistance, the appliance frame could become energized to dangerous voltages. Modern practice is to require a separate safety grounding conductor whose only purpose is to divert unsafe voltages, and which does not carry significant current during normal operation.
3091:
For added protection, WR receptacles should be shielded by "Extra-Duty While In-Use" or "Weather-Resistant" covers. These covers are ruggedly constructed to keep out moisture (either dripping or condensing), dust, debris, and insects, while providing easy access to receptacles to allow their use with
3044:
AFCI protection is mandated by the 2014 Code in residential family rooms, dining rooms, living rooms, kitchens, parlors, libraries, dens, bedrooms, laundry rooms, sunrooms, recreation rooms, closets, hallways or similar rooms. It is also required in dormitory units. AFCI receptacles look similar to
2969:
Over time, electrical codes in the US and Canada began to require additional safety features in the basic NEMA 5-15R and 5-20R configurations to address specific electric shock hazard concerns. The safety features listed below are not mutually exclusive; for example, tamper-resistant GFCI receptacles
2577:
NEMA 23 series devices are specified for three-pole plus neutral, five-wire grounding devices for 3-phase 347/600Y supplies. According to NEMA, NEMA 23 straight-blade devices are "reserved for future configurations", so no designs for this series exist and no devices have been manufactured. There are
2568:
NEMA 22 series devices are specified for three-pole plus neutral, five-wire grounding devices for 3-phase 277/480Y supplies. According to NEMA, NEMA 22 straight-blade devices are "reserved for future configurations", so no designs for this series exist and no devices have been manufactured. There are
2559:
NEMA 21 series devices are specified for three-pole plus neutral, five-wire grounding devices for 3-phase 120/208Y supplies. According to NEMA, NEMA 21 straight-blade devices are "reserved for future configurations", so no designs for this series exist and no devices have been manufactured. There are
2402:
Relying on the neutral conductor was a legal grounding method for electric ranges and clothes dryers, under the
National Electrical Code from the 1947 to the 1993 editions (banned in 1996 edition). Since North American dryers and ranges have certain components (timers, lights, fans, etc.) that run on
343:
The blades of a NEMA connector are identified within the dimensional standard as follows: 'G' identifies the grounding conductor, 'W' identifies the (grounded) neutral conductor, and 'X', 'Y', and 'Z' are the "hot" line conductors. Single-phase connectors have only a single terminal identified as 'X'
2398:
As commonly used, 10-30 and 10-50 plugs required the frame of the appliance to be indirectly grounded via a strap connecting to the neutral blade. Safe operation relied on the neutral conductor in turn being connected to system ground at the circuit breaker or fuse box. If the neutral conductor were
2258:
All NEMA 6 devices are three-wire grounding devices (hot-hot-ground) used for 208 and 240 V circuits and rated for 250 V maximum, with the 6-15, 6-20 and 6-30 being grounding versions of the 2-15, 2-20 and 2-30, respectively. The 6-15 resembles the 5-15, but with collinear horizontal pins,
1966:
There are some obsolete 1-15R or 1-20R (120 V, 15 or 20 A) receptacles which are mechanically able to accept 1-15P (120 V), 1-20P (120 V), 2-15P (240 V), or 2-20P (240 V) plugs. These receptacles are typically found in older residential buildings and are not allowed to be installed under current NEC
3178:
Most duplex receptacles have metal tabs connecting the top and bottom receptacles. These tabs can be broken off to allow the top and bottom receptacles to be wired onto separate circuits. This may allow for one switched receptacle for a lamp, or for two separate supply circuits when heavy loads are
3136:
A receptacle with a green dot is a so-called "hospital grade" device; The primary reason to use a hospital-grade receptacle at a patient bed location is to ensure that a receptacle with a greater contact tension is provided to minimize possibilities that an attachment plug supplying medical or life
3040:
The
National Electrical Code has been updated for 2014 to address the use of Outlet Branch Circuit (OBC) Arc Fault Circuit Interrupter (AFCI) receptacles as an alternative to traditional circuit breakers when used for modifications, extensions, replacement receptacles, or in new construction. AFCI
2685:
One apparent disadvantage of twist-lock connectors is that in the event that the cable is accidentally pulled too hard, rather than the plug falling out of the receptacle, exposed conductors may come out of the plug, causing dangerous shorts or shock hazards if the circuit is live. This is resolved
2656:
The appearance of this plug is sometimes confused with a NEMA 10 connector, rated for 240 V, but the NEMA TT-30 is a 120 V device. The hot and neutral blades are angled at 45° from vertical and 90° to each other, unlike NEMA 10 devices (where the angles are 30° and 60° respectively), also
2208:
In 46 of the 50 United States and all of Canada, tamper-resistant receptacles are required in new residential construction as of
November 2013. These prevent contact by objects like keys or paper clips inserted into the socket. This is accomplished by an interlocking mechanism that requires hot and
3311:(applied 1881, awarded 1881) Two examples of screw system appear, including the kerosene-can lid, but their overall formations are incompatible with today's Edison sockets. No explicit claims for the screw system. Beware patents.google.com's preview mode lacks several pages, must download full PDF.
2766:
L6-20 connectors provide a maximum of 20 amperes and are commonly found in power distribution units (PDUs) used in the information technology sector. Most often, these connectors can be found in server rooms and data centers where the connectors are used to power equipment such as servers, backup
2681:
Locking connectors come in a variety of standardized configurations that follow the same general naming scheme except that the designations include an "L" for "locking". Locking connectors are designed so that different voltages and current ratings can not be accidentally intermated. Many specific
2442:
These sockets and plugs are four prong (see receptacle chart above) grounding devices (hot–hot–neutral–ground) available in ratings from 15 to 60 A. The voltage rating is 250 V. Of the straight-blade NEMA 14 devices, only 14-50 and 14-30 are in common use and either may be used for home
262:
It is worth noting that in addition to
Hubbell's system, circulated a large variety of different plugs and receptacles, some of them compatible with Hubbell's, some not. In 1919, Hubbell unsuccessfully tried to prevent other manufacturers from making receptacles and plugs to the dimensions used by
3027:
This safety measure reduces shock hazards to a child that attempts to insert a single conductive object into the receptacle. Inserting a normal, two-blade electrical plug applies simultaneous pressure on both sides of the receptacle to open an internal, spring-loaded shutter, but a foreign object
1826:
NEMA non-locking connectors all use blades of various flat and folded shapes (except for the round pins used on grounding connectors). The plugs can be detached from the receptacles by pulling back on the plug body. These connector families have been designed so that connectors of differing types
2913:
NEMA L21 are four-pole and ground connectors rated for 120/208 V. Intended for wye three-phase circuits with both neutral and ground. The pin in the middle is ground, and the blade with a right angle on the tab is neutral. These connectors are common in live event power distribution. Many
1908:
1-15R receptacles have been prohibited in new construction in the United States and Canada since 1962, but remain in many older buildings, and this obsolete design is still available for repair use only. Since
January 1, 1974, all new power outlets are required to have a ground connection, using
2340:
NEMA 7 devices are three wire/prong (hot-neutral-ground) connectors rated at 277 V. The 15 A 7-15 plug has the crowsfoot current carrying pins of the Type I plug, but with a U-shaped earth pin. The 7-20 version has an enlarged line/hot pin. 7-30 is a larger diameter connector, with an
2816:
NEMA L11 series devices are three-pole, three-wire, non-grounding devices for three-phase 250-volt devices. Designs exist for 15-ampere (L11-15), 20-ampere (L11-20), and 30-ampere (L11-30) devices, and L11-20 and L11-30 devices were commercially available from at least one manufacturer (Bryant
2677:
to refer to NEMA locking connectors manufactured by any company. Locking connectors use curved blades. Once pushed into the receptacle, the plug is twisted and its now-rotated blades latch into the receptacle. To unlatch the plug, the rotation is reversed. The locking coupling makes for a more
1970:
The
Japanese plug and socket with narrow insulating faces appear and work physically identical to NEMA 1-15, and such non-grounded receptacles are still common in Japan (though grounded 5-15R and 5-20R receptacles are slowly becoming more common). The Japanese system incorporates stricter
294:
There are two basic classifications of NEMA connectors: straight-blade and locking. The metal conductive blades are often informally called "prongs" (as in "3-prong plug"). Numbers prefixed by 'L' are curved-blade, twist-locking connectors. Twist-locking types are used for heavy industrial and
340:" of hazardous equipment, by physically preventing insertion of locked plugs into a power receptacle. Since at least 1949, numerous receptacle devices have also been invented to use these holes to hold the prongs inside the receptacle slots, using a corresponding latch or locking mechanism.
3000:
Like most current interrupting devices, a GFCI receptacle can optionally be wired to feed additional "downstream" outlets; correctly installing one GFCI receptacle in a circuit can protect all the plugs, lights, switches, and wiring which receive power from it. This allows for cost-effective
2753:
NEMA L5 connectors are a series of two-pole and ground locking connectors rated for 125 V. L5-30R receptacles are common at marinas that provide power to docked boats. They are also found on some RVs for connecting to shore power. RVs in the US are equipped for 120 V 30 A or
2657:
the plug is slightly smaller than a NEMA 10 and larger than ordinary 5-15P plugs. The ground pin is round, like those on straight-blade NEMA grounding devices. Referring to the picture, the orientation is the same as the NEMA 5 plug and receptacle, with the neutral blade on the lower right.
309:
As an example, the 5-15R is the common 125 V two-pole, three-wire receptacle rated for 15 A. The L5-15R, while sharing the same electrical rating, is a locking design that is not physically compatible with the straight-blade 5-15 design. The 5-30R has the same two-pole, three-wire
3124:
The color of a device neither identifies its voltage class nor power system. Because the colors are not specified by NEMA standards, the purpose of color-coding a receptacle may be set by the building owner, who may select brown, ivory, white, almond, grey, or black receptacles in the 5-15
2896:
NEMA L20 series devices are three-pole, four-wire, non-grounding devices for three-phase 347/600-volt devices. Designs exist for 20-ampere (L12-20), and 30-ampere (L20-30) devices, and L20-20 and L20-30 devices were commercially available from at least one manufacturer (Bryant
Electric).
2887:
NEMA L19 series devices are three-pole, four-wire, non-grounding devices for three-phase 277/480-volt devices. Designs exist for 20-ampere (L19-20), and 30-ampere (L19-30) devices, and L19-20 and L19-30 devices were commercially available from at least one manufacturer (Bryant
Electric).
2204:
The 5-15R and 5-20R are by far the most common electrical receptacle in North
America in buildings built since the mid-twentieth century. It is usually installed in a duplex configuration; two receptacles may share a common circuit or may each be wired separately, sometimes to a switch.
3067:
on the power supply line, which can damage sensitive electronics such as TVs, computers, and smart appliances. They are available for 120 V, 15/20 A applications, in different form factors such as surge protective receptacles in single, duplex, four-in-one, and six receptacle
2762:
NEMA L6 connectors are rated for a maximum of 250 volts. They are intended for two-pole, three wire, line-line-earth (or hot-hot-ground) circuits with a nominal supply voltage of 208 or 240 volts, depending on phase configuration. The L6 connector does not provide a neutral connection.
2825:
NEMA L12 series devices are three-pole, three-wire, non-grounding devices for three-phase 480-volt devices. Designs exist for 20-ampere (L12-20), and 30-ampere (L12-30) devices, and L12-20 and L12-30 devices were commercially available from at least one manufacturer (Bryant
Electric).
3041:
receptacles reduce the dangers associated with potentially-hazardous arcing conditions (parallel arcs and series arcs), by interrupting power to arcing devices (e.g. a damaged appliance cord) that might otherwise not draw enough current to trip the primary circuit protection device.
55:
Common North American 125-volt receptacles. All accept a 1-15P plug; the two on the left also accept grounded 5-15P plugs; the second from the left also accepts 5-20P plugs. The NEMA 5-15R device on the far left is most common; the two rightmost designs are typically seen in older
150:
standard for electric connection. In the early 1900s, table and floor lamps became more popular, and sockets were mounted on walls for secondary connections. One big disadvantage of screw connectors was that the cord inevitably got twisted after being connected to the receptacle.
105:
NEMA 1-15P (two-pole, no ground) and NEMA 5-15P (two-pole with ground pin) plugs are used on common domestic electrical equipment, and NEMA 5-15R is the standard 15-ampere electric receptacle (outlet) found in the United States, and under relevant national standards, in Canada
2283:
The higher-current receptacles are rare, with twist-locking plugs such as L6-30 and direct wiring being more common. Generally, 6-series non-locking plugs are used for such appliances as large room air conditioners and commercial kitchen equipment; the occasional home
1909:
grounded receptacles (typically 5-15R or 5-20R) that accept both grounded and non-grounded plugs. Replacement of obsolete NEMA 1 receptacles requires either rewiring with an additional ground conductor for a NEMA 5 receptacle, or a NEMA 5 receptacle complete with a
263:
Hubbell. The report of the court proceedings includes a comprehensive review of the development of the art in the US prior to 1919, based on evidence presented to the Court. Separable plugs had been available for more than a decade prior to Hubbell's 1904 design.
3137:
support equipment may be disconnected because the attachment plug slipped out of the receptacle. Also such devices are tested to survive harder use while limiting electrical leakage, compared to wiring devices intended for residential or commercial purposes.
3204:
maintain Federal Specification W-C-596 and its associated specification sheets. This specification references WD-6 and UL 498, and provides additional durability and electrical safety performance criteria for connectors intended for military use.
313:
Although there are several non-grounding device types in the NEMA standards, only three of them are in widespread use today. These are the two-pole 1-15, still in use in millions of buildings built before the 1960s, and the three-pole 10-30 and 10-50.
2807:
NEMA L10 series devices are two-pole plus neutral, three-wire, non-grounding devices for 125/250 volts single-phase. These are deprecated due to the lack of grounding but L10-20 and L10-30 devices are specified by NEMA and are commercially available.
2834:
NEMA L13 series devices are three-pole, three-wire, non-grounding devices for three-phase 600-volt devices. Designs exist for 30-ampere (L13-30) devices and L13-30 devices were commercially available from at least one manufacturer (Bryant Electric).
2433:
NEMA 13 series devices are three wire, three-pole, non-grounding devices for 3-phase, 600-volt equipment. According to NEMA, this is "reserved for future configurations", so no designs for this series exist and no devices have been manufactured.
2424:
NEMA 12 series devices are three wire, three-pole, non-grounding devices for 3-phase, 480-volt equipment. According to NEMA, this is "reserved for future configurations", so no designs for this series exist and no devices have been manufactured.
3364:
2077:
All NEMA 2 devices are two-wire non-grounding devices (hot-hot) rated for 250 V maximum. Although standards exist for 2-15, 2-20 and 2-30, this series is obsolete, and only Hubbell still manufactures 2-20 devices (for repair purposes).
3191:
maintains UL Standard 498, which specifies construction performance (e.g. durability, electrical safety, and fire-resistance) for NEMA connectors. These additional requirements allow connectors to be manufactured to be compliant with the
2095:
This series of devices is specified for 600-volt, two-wire, non-grounding devices. Identically to the NEMA 3 series, this is "reserved for future configurations" and no designs for this series exist and no devices have been manufactured.
3527:
2550:
NEMA 20 series devices are specified for 347/600Y three-pole, four-wire, non-grounding devices. According to NEMA, this is "reserved for future configurations", so no designs for this series exist and no devices have been manufactured.
2843:
NEMA L14 are three-pole and ground connectors rated for 125/250 V. Intended for three-pole, four-wire hot-hot-neutral-ground circuits with a nominal supply voltages of 240 or 208 V hot-to-hot and 120 V hot-to-neutral.
2368:
2196:
has stated: "Never remove the ground pin (the third prong) to make a three-prong plug fit a two-prong outlet". In addition to the dangers of breaking a ground connection, removing the ground pin to make it fit a 1-15R receptacle or
2931:
NEMA L23 are four-pole and ground connectors rated for 347/600 V. Intended for wye three-phase circuits with both neutral and ground. The pin in the middle is ground, and the blade with a right angle on the tab is neutral.
2922:
NEMA L22 are four-pole and ground connectors rated for 277/480 V. Intended for wye three-phase circuits with both neutral and ground. The pin in the middle is ground, and the blade with a right angle on the tab is neutral.
2358:
NEMA 9 devices are specified for three wire, two-pole, grounding devices for 600 volts. According to NEMA, this is "reserved for future configurations", so no designs for this series exist and no devices have been manufactured.
2349:
NEMA 8 devices are specified for three wire, two-pole, grounding devices for 480 volts. According to NEMA, this is "reserved for future configurations", so no designs for this series exist and no devices have been manufactured.
2541:
NEMA 15 are three-pole and ground connectors (phase A, phase B, phase C, ground) rated for 208 V. Intended for delta three-phase circuits with ground and no neutral. The straight blades all carry one of the three phases.
3088:. Mandated by the 2008 National Electrical Code in outdoor damp or wet locations, WR receptacles are required in patio, deck, and pool areas. They are available in a variety of variations, including GFCI and tamper-resistant.
2914:
event production companies use power distributors with camlock connectors for feeder cable, and 12 or more L21-30 connectors which can each be broken out to three individual 120 V circuits via the use of a stringer box.
302:
power. A connector with ground terminal is described as having more wires than poles, e.g. two-pole, three-wire; or four-pole, five-wire; etc. A non-grounding device may be two-pole, two-wire; three-pole, three-wire; etc.
2086:
This series of devices is specified for 277-volt, two-wire, non-grounding devices. According to NEMA, this is "reserved for future configurations", so no designs for this series exist and no devices have been manufactured.
2477:
to utility power via a 14-50 device. Newer applications include electric vehicle charging. The 6-50 is a smaller size receptacle lacking a neutral fourth prong, exclusively providing 240 V, also used for electric vehicle
2030:
Newer NEMA 1-15 plugs with wider protective faces (middle right) have a safety advantage; plugs for electric toys (right) as well as very early plugs (left) have noticeably wide faces to discourage touching the electrical
2774:
L6-30 connectors provide a maximum of 30 amperes and tend to be used in heavy-industry sectors. For example, welders and other manufacturing machinery where industrial equipment or large power tools are commonplace.
2415:
NEMA 11 series devices are three wire, three-pole, non-grounding devices for 3-phase 250-volt designs and equipment parts are specified by NEMA for 20-ampere (11-20), 30-ampere (11-30), and 50-ampere (11-50) devices.
98:(V). Different combinations of contact blade widths, shapes, orientations, and dimensions create non-interchangeable connectors that are unique for each combination of voltage, electric current carrying capacity, and
2132:
All NEMA 5 devices are three-wire grounding devices (hot–neutral–ground) rated for 125 V maximum, with the 5-15, 5-20 and 5-30 being grounded versions of the 1-15, 1-20 and 1-30, respectively. The addition is a
2061:
3365:
https://books.google.co.uk/books?id=XOgsAAAAYAAJ&printsec=frontcover&dq=the+trademark+reporter+volume+10&hl=en&sa=X&ved=0ahUKEwjHgZr29YvXAhUCSRoKHWQaDOAQ6AEIJjAA#v=onepage&q&f=false
2660:
Adapters are available with the TT-30P plug on one side and a 5-15R or 5-20R receptacle on the other side. When a power feed cord is detachable from an RV, an L5-30P is usually used on the RV end of the cord.
204:
221:
2944:
A North American NEMA-5 receptacle halfway through a corrective re-installation. The fluorescent green spacers, which firmly attach the receptacle to the metallic sub-structure, are made necessary by using
3179:
anticipated. Two branch circuits may optionally share a common neutral wire terminating on duplex receptacles, a condition sometimes referred to as "split-wiring", "split-receptacle", or "half-split".
332:
The small hole near the end of the power (non-ground) blades of some NEMA plugs is used for convenience in manufacturing; if present, it must be of specified diameter and position. Small specialized
4181:
2783:
NEMA L7 are two-pole and ground connectors rated for 277 V. Typically, these connectors are found in commercial or industrial lighting circuits, especially where metal halide lamps are common.
3523:
2403:
120 V, this means that the neutral wire indirectly used for grounding would also carry current, even under non-fault conditions. Although this is contrary to modern grounding practice, such "
1982:
NEMA standards exist for 1-15P, 1-20P and 1-30P plugs, and the 1-15R receptacle. There are no 1-20R and 1-30R receptacles, because 1-20P and 1-30P can mate with a corresponding NEMA 5 receptacle.
238:
2317:
2458:. The 14-30 has a rating of 30 A, and an L-shaped neutral blade. The 14-50 has a rating of 50 A, and a straight neutral blade sized so that it does not mate with 14-30 connectors.
3005:
between wet and dry locations. A GFCI receptacle may be installed indoors where it is sheltered from dampness and corrosion, while still protecting an outdoors receptacle wired downstream.
2515:
2037:
3020:
tamper-resistant receptacles that address electric shock hazards to children must now be installed in almost all areas of new or renovated dwellings. According to statistics cited by the
317:
Other types of NEMA connectors that do not follow this nomenclature include: the ML series (so-called "Midget Locking" connectors named for their diminutive size), TT (for connecting
2292:
unloaders, and is used with a 6-gauge flexible power cord up to 200 ft (61 m) long. The 6-50 receptacle charges electric vehicles at the same 32- or 40-ampere maximum from
184:
in 1912. The new design had parallel blades, a more compact design and was easier to manufacture. This design was improved once again in 1915, introducing a polarized plug under the
138:
In the early days of electrification, residential use was almost exclusively for illumination, with rooms normally having just a single spot in the center. Along with his lightbulb,
2682:
types exist; only a few are listed below. Other types include special purpose connectors for boats, 400 Hz circuits such as used for aircraft, and direct-current applications.
2745:
These devices would have been for 277- and 600-volt two-pole, two-wire non-grounding devices similar to the straight-blade NEMA 3 and 4 families, but were never specified by NEMA.
1963:
to allow connecting to ground, often via the cover screw used to attach the outlet faceplate. These adapters are illegal in some jurisdictions, in particular throughout Canada.
1858:
blades and slots, is used in most of North America and on the east coast of South America on lamps; consumer electronics such as clocks, radios, and battery chargers; and other
3959:
306:
The numerals following the hyphen is the current rating of the device in amperes. This number is followed by the letter 'R' to indicate a receptacle or 'P' to indicate a plug.
291:
NEMA connectors are named following an alphanumeric code consisting of: prefix "L" (locking types), numerals, a hyphen, numerals, suffix "R" or "P" for "receptacle" or "plug".
2280:
power supply, respectively. The NEMA 6-20R or 6-30R found in many hotel and motel rooms is typically supplied with either split-phase or two phases of three-phase 208 V.
1916:
Ungrounded NEMA 1 plugs are still popularly used by manufacturers of small appliances and electronic devices because of the design's low cost and compact size, and they are
2108:
NEMA 5-15P plug and NEMA 5-15R receptacle (different scales, blade spacing is 0.5 inches (12.7 mm) for both.) Each receptacle also accepts an ungrounded plug, whether
2729:
NEMA L1 series devices are single-pole plus neutral, two-wire, non-grounding devices for 125 volts single phase. Designs and devices for 15-ampere devices (L1-15) exist.
3236:
4355:
4320:
2012:
1927:
In older plug designs both blades were the same width, so the plug could be inserted into the receptacle either way around. Many plugs manufactured since 1948 are
3573:
2249:
IEC system of plugs and sockets-outlets for household and similar purposes – Part 2: Plugs and socket-outlets 15 A 125 V a.c. and 20 A 125 V a.c.
272:
79:
2993:
These safety devices work by comparing the currents flowing in the live and neutral conductors, and disconnect the circuit if their difference exceeds 4 to 6
1839:
2737:
NEMA L2 series devices are two-pole, two-wire, non-grounding devices for 250 volts single-phase. Designs and devices for 20-ampere devices (L2-20) exist.
4059:
2193:
2244:
3461:
2272:
NEMA 6 devices, while specified as 250 V, may be used for either 208 or 240 V circuits, generally depending on whether the building has a
2503:
1972:
2000:
298:
The numerals preceding the hyphen encode the number of poles (current-carrying terminals) and wires connected to it, the voltage, and single- or
3881:
4295:
4239:
3100:
Damaged power cords of portable air conditioners have caused many electrical fires, and about 350 deaths per year. To combat this, the 2017
2128:
5-20R T-slot receptacle mounted with the hole for the ground pin at the top. The neutral connection is the wider T-shaped slot on the right.
1920:
with modern grounded NEMA 5 receptacles. Standards permit ungrounded plugs where the appliance does not require grounding due to low risk of
1865:
All NEMA 1 devices are two-wire non-grounding devices (hot-neutral) rated for 125 V maximum. 1-15P plugs have two parallel flat blades,
133:
2296:, on a short cord, as the more versatile 14-50 with its fourth prong neutral not used currently for any electric vehicle charging purposes.
3021:
3002:
2678:
reliable connection in commercial and industrial settings, where vibration or incidental impact could disconnect a non-locking connector.
2049:
3794:
3623:
3008:
GFCIs are also recommended for power tool outlets and any locations where children might insert conductive objects into the receptacles.
3225:
2305:
2153: in (3.2 mm) longer than the power blades (so the device is grounded before the power is connected) and located from them by
3966:
4266:
3748:
3715:
3479:
2653:
in the United States and Canada, and all but the largest RVs manufactured since the 1970s use this plug to connect to power feeds.
2209:
neutral blades inserted simultaneously to release the small doors blocking the slots. The grounding slot is not blocked by a door.
4207:
3497:
3109:
3990:
347:
Criticism has been aimed at the design leaving a gap with exposed prongs. This safety flaw has been exploited by a January 2020
4398:
3201:
146:
in the early 1880s, for which he received a patent in 1881. The Edison screw was very successful, and quickly became the first
4281:
3080:
Weather-resistant (WR) receptacles are made with ultraviolet-resistant insulating materials having excellent cold-temperature
2982:
Tamper-resistant GFCI duplex receptacle type 5-20RA, which can take 5-15 and 5-20 grounding plugs and 1-15 non-grounding plugs
2669:
Twist-locking connectors were first invented by Harvey Hubbell III in 1938 and "Twist-Lock" remains a registered trademark of
4152:
3691:
3601:
1988:
3855:
3072:. These devices provide point-of-use protection and are the last line of defense in a whole-house surge protection network.
2601: with: "24" is hot-linked elsewhere in this article but is not fully described anywhere in the article. You can help by
2176:
Compared to the 5-15P plug, the 5-20P plug has the neutral blade rotated 90° and shifted so its inner edge is approximately
3321:
Schroeder, Fred E. H. (1986-01-01). "More "Small Things Forgotten": Domestic Electrical Plugs and Receptacles, 1881-1931".
4403:
4117:
3932:
3128:
However, although colors are not standardized by NEMA, some industries utilize colors for certain applications, following
3105:
3843:
3242:
2768:
1976:
3895:
2694:
ML-series "Midget Locking" connectors are for 15 A applications where a larger locking connector would not fit.
2578:
however NEMA L23 series locking devices for 20- and 30-ampere devices specified and available for these applications.
2569:
however NEMA L22 series locking devices for 20- and 30-ampere devices specified and available for these applications.
2560:
however NEMA L21 series locking devices for 20- and 30-ampere devices specified and available for these applications.
1959:
adapters allow a "3-prong" grounded 5-15P plug to be mated to a non-grounded 1-15R receptacle. The adapters include a
2847:
These connectors are common on household backup generators, and on racks of power amplifiers in large audio systems.
1971:
dimensional requirements for the plug housing, different marking requirements, and mandatory testing and approval by
4091:
2978:
3214:
2455:
2451:
2450:
All NEMA 14 devices offer two hots, a neutral, and a ground, allowing for both 120 and 240 V when supplied by
2277:
2273:
64:
38:
4025:
2799:
NEMA L9 are two-pole and ground connectors rated for 600 V. Intended for three-wire hot-hot-ground circuits.
2791:
NEMA L8 are two-pole and ground connectors rated for 480 V. Intended for three-wire hot-hot-ground circuits.
2189:
The neutral blade on 5-15P plugs is not always wider than the line blade, since the ground pin enforces polarity.
3188:
3017:
3656:
3197:
3193:
3101:
2285:
1835:
1831:
2940:
2879:
NEMA L18 are four-pole no ground connectors rated for 120/208 V. Intended for wye three-phase circuits.
124:
The dimensional standard for electrical connectors is ANSI/NEMA WD-6 and is available from the NEMA website.
4408:
3918:
3084:
to withstand longterm exposure to weathering and abuse. Metallic components are required to be resistant to
2987:
1910:
4066:
3155:
2491:
2674:
322:
2871:
NEMA L17 are three-pole and ground connectors rated for 600 V. Intended for three-phase circuits.
2863:
NEMA L16 are three-pole and ground connectors rated for 480 V. Intended for three-phase circuits.
2855:
NEMA L15 are three-pole and ground connectors rated for 250 V. Intended for three-phase circuits.
3162:
requires that "essential" receptacles in hospitals, connected to emergency power systems, must be red.
353:
2670:
2642:
2470:
2392:
362:
99:
4383:
2621:
NEMA 24 Series devices are specified for two pole, three-wire grounding devices for 347V A/C power.
4256:
3262:
CSA Standard C22.2 No. 42-10: General use receptacles, attachment plugs, and similar wiring devices
3024:, the code change adds only $ 40 to the cost of building an average, 75-receptacle home in the US.
2375:
NEMA 10-30 has a neutral pin (at top of photo), but does not have a dedicated safety grounding pin.
2237:
2109:
348:
68:
4371:
4335:
4299:
3740:
Set Lighting Technician's Handbook: Film Lighting Equipment, Practice, and Electrical Distribution
3401:
3547:
3346:
3338:
3589:
3284:
2124:
2043:
A NEMA 1 cord from 1932, with wide protective face to prevent touching the electrical contacts.
295:
commercial equipment, where increased protection against accidental disconnection is required.
4349:
4314:
4262:
4235:
3744:
3711:
3687:
3632:
3129:
3081:
1917:
357:, where conductive materials, usually coins or paper clips were dropped into the gap, causing
71:
4377:
215:, fig. 1, illustrating a lightbulb socket adaptor and an attachable flat blade socket for it.
3330:
3187:
The dimensions and configurations for NEMA connectors are given in ANSI/NEMA standard WD-6.
3148:
3064:
2905:
2526:
2479:
2444:
2293:
2067:
Japanese socket having the narrowest socket face with grounding post, for an air conditioner
1859:
366:
83:
3936:
3141:
3054:
2383:
type that had formerly been popular in the United States for use with high-power electric
1921:
325:
to external power sources), SS series ("ship-to-shore" connectors for connecting boats to
318:
1830:
NEMA wall receptacles can be found installed in any orientation. Neither NEMA nor the US
121:
Other plug and receptacle types are for special purposes or for heavy-duty applications.
3104:(NEC) requires each portable air conditioner sold in the United States to have either a
2720:
SS2-50 connectors are three-pole with ground (hot-neutral-hot) rated for 125/250 V.
2713:
SS-series "Ship-to-shore" connectors are for 50 A marine shore-power applications.
2704:
ML-3 connectors are for three-pole no ground (hot-neutral-hot) rated for 125/250 V.
2240:
use these extension cords to deliver power to lights rated at 2,000 watts or less.
4232:
C22.1-15—Canadian Electrical Code, Part I: Safety Standard for Electrical Installations
3947:
3425:
3016:
Starting with the 2008 National Electrical Code and the 2009 Canadian Electrical Code,
2638:
2404:
2213:
2198:
2104:
1928:
358:
337:
160:
30:"Twist-lock connector" redirects here. For the device used in intermodal shipping, see
2590:
2116:
190:. The flat blade plug which in subsequent years evolved to become NEMA 1-15 was born.
4392:
3997:
3350:
3140:
Per UL Standard ANSI/UL 498, a receptacle (any color) with an orange triangle, is an
3060:
2633:
NEMA TT-30 plug and receptacle. (The center hole on the receptacle is not a contact.)
2388:
2384:
2341:
L-shaped neutral, while the 7-50 has an enlarged neutral pin, compared with the hot.
2243:
Internationally, the NEMA 5-15P plug and NEMA 5-15R receptacle are the basis for the
1913:
for two-wire non-grounded configurations (when a ground conductor is not available).
139:
75:
3820:
3524:"NFPA :: Research :: Charles S. Morgan Library :: FAQ/Facts and lore"
283:
3154:
A red receptacle may indicate a special-service outlet such as one connected to an
1956:
143:
43:
3032:
hazard when removed), and to sliding covers that children easily learn to defeat.
3859:
3738:
3705:
344:
or two terminals, 'X' and 'Y'. Three-phase connectors will use 'X', 'Y' and 'Z'.
17:
3929:
3069:
2474:
2380:
1855:
326:
299:
232:, fig. 1 and 3. First patent showing the parallel blades which became NEMA 1-15.
51:
3286:
ANSI/NEMA WD 6-2016: Wiring Devices – Dimensional Specifications
3448:
3113:
2466:
2372:
1952:
245:
228:
186:
180:
3307:
211:
171:
165:
4140:
4124:
4032:
3230:
3166:
3165:
At least one manufacturer makes a yellow receptacle, which identifies it as
3085:
3059:
Surge protective devices are designed to reduce the random energy surges of
2522:
1960:
31:
3770:
3560:
JIS C 8303-1993, Plugs and Receptacles for Domestic and Similar General Use
178:
In 1910, Hubbel worked on improving his popular flat blade design, filled
4095:
3264:. Mississauga, Ontario: Canadian Standards Association. 2010. p. 1.
1434:
1425:
1416:
1407:
1398:
1389:
1380:
1371:
1362:
1353:
1327:
1318:
1309:
1300:
1291:
1282:
1273:
1264:
1255:
1246:
1220:
1211:
1202:
1193:
1184:
1175:
1166:
1157:
1148:
1139:
1078:
1069:
1060:
1051:
1042:
1033:
1024:
1015:
986:
977:
968:
959:
950:
941:
27:
Power plugs and receptacles used in North America and some other regions
4234:(23rd ed.). Canadian Standards Association. 2015. Rule 24–106(6).
3342:
3219:
3029:
2686:
in most cases by the connector having a robust integral strain relief.
2650:
2629:
2462:
2367:
2018:
AC adapter with integrated plug pins matching an unpolarized NEMA 1-15P
877:
868:
859:
850:
841:
832:
823:
814:
788:
779:
770:
761:
752:
743:
734:
725:
699:
690:
681:
672:
663:
654:
645:
636:
572:
563:
554:
545:
536:
502:
488:
474:
465:
333:
91:
3239:, which includes some non-NEMA plugs and sockets used in North America
3237:
Industrial and multiphase power plugs and sockets § North America
2216:
for film and theater, this connector is sometimes informally known as
3991:"Tamper Resistant Receptacles: The New Standard of Electrical Safety"
3376:
3233:, an international standard for power "inlet" connectors on equipment
2994:
87:
3662:
3462:"What Is The 'Outlet Challenge'? How It Can Electrocute Or Burn You"
3334:
2965: in (13 mm), or by slightly-misplaced device box housings.
3402:"Museum of Plugs and Sockets: history of British plugs and sockets"
2407:" installations remain common in older homes in the United States.
329:) and the FSL series (used in military and aircraft applications).
287:
NEMA receptacles, with their common US uses listed (in purple text)
3856:"TeslaMotors.com: Go Electric – Ready, Set, Charge"
3289:. National Electrical Manufacturer's Association. 2016. p. 17
3001:
retrofits on older installations where branch circuits were often
2977:
2939:
2904:
2628:
2366:
2123:
2115:
249:
fig. 4 and 5, showing a concept for polarized receptacle and plug.
2717:
SS1-50 connectors are two-pole with ground, rated for 125 V.
310:
configuration and 125 V rating, but is rated for 30 A.
3882:"Home EV charging: How to know which plug type is right for you"
2701:
ML-2 connectors are two-pole with ground, rated for 125 V.
2324:
2289:
2288:
also uses 6-50. Single-phase 6-50 is commonly used on farms for
378:
95:
2525:(9.6 kW sustained) on a 240 V circuit to recharge an
3449:
e.g., US Patent 2,664,734, H.McEneaney, issued January 5, 1954
2698:
ML-1 connectors are two-pole, no ground, rated for 125 V.
2585:
3480:"Dangerous TikTok Challenge Sparks Warning From Firefighters"
3498:"Authorities warn about dangerous TikTok 'outlet' challenge"
2649:. The TT-30R receptacle is commonly available in nearly all
2143:-inch (4.8 mm) diameter round or U-shaped ground pin,
1862:
small appliances that do not require grounding (earthing).
2055:
Japanese socket with grounding post, for a washing machine
1875:
inch (6.4 mm) wide, 0.06 inches (1.5 mm) thick,
4336:"Connector, Electrical, Power, General Specification for"
3603:
Pull the Plug on Cord-Related Hazards this Holiday Season
2323:
NEMA 6-50 with dustproof flexible shroud, used on a farm
78:
and other countries that use the standards set by the US
4031:. US Consumer Product Safety Commission. Archived from
3948:
Hubbell Twist-Lock Wiring Devices and Safety Enclosures
3096:
Leak-current detection and interruption (LCDI) cordsets
2602:
2201:, may result in the live–neutral polarity being lost.
4208:"Application Guide for Isolated Ground Wiring Devices"
4118:"Hospital Grade Devices: Tamper Resistant Receptacles"
4065:. National Fire Protection Association. Archived from
3092:
power tools, trimmers, sprinkler systems, and pumps.
1955:, are still produced with unpolarized narrow blades.
3625:
Tamper-Resistant Receptacles — A Successful Adoption
2986:
These versions of the 5-15R or 5-20R receptacle are
2974:
Ground fault circuit interrupter (GFCI) receptacles
3960:"Industrial grade 15A midget type locking devices"
2395:was incorporated in the National Electrical Code.
1994:A non-polarized 1-15P plug has 2 identical blades.
175:Both these patents were granted in November 1904.
47:Ungrounded (left) and grounded (right) power plugs
3125:configuration to blend with the decor of a room.
4261:. Newtown, CT: Taunton Press. pp. 170–171.
3821:"NEMA 6 50 vs 14 50 (Which Plug is Superior?) |"
3426:"Museum of Plugs and Sockets: DIN VDE 9400–9403"
2311:NEMA 6-15 (Green "U"-shaped contact is ground.)
1854:This "2-prong" design, with two flat parallel
3707:Technical Film and TV for Nontechnical People
3684:Technical Film and Tv for Nontechnical People
2645:standard (hot-neutral-ground), also known as
2006:One blade is wider on a polarized 1-15P plug.
273:National Electrical Manufacturers Association
80:National Electrical Manufacturers Association
8:
3068:configurations, as well as surge-protective
2509:NEMA 14-30 clothes dryer receptacle and plug
336:are available to fit these holes, allowing "
4354:: CS1 maint: numeric names: authors list (
4319:: CS1 maint: numeric names: authors list (
3844:Receptacle Roundup IV: NEMA 10-30 and 14-30
2461:NEMA 14-50 devices are frequently found in
1840:National Electrical Contractors Association
4153:"2017-NEC-Significant-Code-Changes-Part-2"
4123:. Pass and Seymour Legrand. Archived from
4054:
4052:
2473:. Also, it was formerly common to connect
2194:Electrical Safety Foundation International
2173: in (11.9 mm) center-to-center.
1895:inch (15.9–18.3 mm) long, and spaced
1844:National Electrical Installation Standards
1433:
1424:
1415:
1406:
1397:
1388:
1379:
1370:
1361:
1352:
1326:
1317:
1308:
1299:
1290:
1281:
1272:
1263:
1254:
1245:
1219:
1210:
1201:
1192:
1183:
1174:
1165:
1156:
1147:
1138:
1077:
1068:
1059:
1050:
1041:
1032:
1023:
1014:
985:
976:
967:
958:
949:
940:
876:
867:
858:
849:
840:
831:
822:
813:
787:
778:
769:
760:
751:
742:
733:
724:
698:
689:
680:
671:
662:
653:
644:
635:
571:
562:
553:
544:
535:
501:
487:
473:
464:
4141:http://www.passandseymour.com/pdf/F10.pdf
4060:"Tamper-Resistant Electrical Receptacles"
2955: in (16 mm) drywall instead of
2454:, or 120 and 208 V if the supply is
2245:International Electrotechnical Commission
1838:specify a preferred orientation, but the
3996:. Hubbell Wiring Systems. Archived from
3147:A blue receptacle may indicate built-in
3112:(GFCI) protective device built into its
2103:
1450:
371:
282:
50:
42:
4020:
4018:
3253:
2487:
2301:
2163: in (6.4 mm) edge-to-edge or
1984:
1924:, such as on double-insulated devices.
373:NEMA Receptacle chart (non-twist lock)
200:
4347:
4312:
3562:, Japanese Standards Association, 1993
2641:) connector is a 120 V 30 A
4094:. Child Safety Outlet. Archived from
3896:"NEMA Straight Blade Reference Chart"
3279:
3277:
3275:
3273:
3271:
3222:, British three-pin plugs and sockets
134:History of AC power plugs and sockets
7:
3106:leakage current detector interrupter
2120:Typical 5-15R residential receptacle
3858:. Tesla Motors, Inc. Archived from
3743:(3rd ed.). Focal. p. 20.
3226:CEE 7 standard AC plugs and sockets
1827:cannot be accidentally intermated.
82:. NEMA wiring devices are made in
4296:"Attachment Plugs and Receptacles"
25:
3686:, Skyhorse Publishing Inc., 2002
3548:Electrical Safety | Novascotia.ca
3590:NEMA Locking Configuration Chart
3110:ground-fault circuit interrupter
2589:
2514:
2502:
2497:NEMA 14-30 and 14-50 receptacles
2490:
2316:
2304:
2060:
2048:
2036:
2023:
2011:
1999:
1987:
1911:ground fault circuit interrupter
237:
220:
203:
4384:Introduction to NEMA connectors
3771:"IEC 60906-2:2011 IEC Webstore"
3530:from the original on 2009-10-14
3202:General Services Administration
2521:A NEMA 14-50 supplying 12
1547:
361:, which once led to a building
3156:emergency standby power source
2637:The NEMA TT-30 (TT stands for
1941: in or 7.9 mm wide,
1:
3076:Weather-resistant receptacles
2379:NEMA 10 connectors are a now
4182:"Hospital Grade Power Cords"
4092:"Frequently Asked Questions"
3460:Lee, Bruce Y. (2020-02-23).
3243:Mains electricity by country
3049:Surge protective receptacles
3012:Tamper-resistant receptacles
2673:, although the term is used
1804:
1799:
1791:
1786:
1778:
1773:
1751:
1746:
1738:
1733:
1725:
1720:
1672:
1661:
1581:
258:Other American manufacturers
4186:International Configuration
2465:, since they are used for "
1905:inch (12.7 mm) apart.
1634:
1629:
1621:
1610:
1605:
1570:
1565:
1543:
1534:
1462:120/208/240 V service
155:Harvey Hubbell's inventions
4425:
3935:February 14, 2010, at the
3215:AC power plugs and sockets
3052:
2936:Additional safety features
2909:L21-30 plug and receptacle
2222:Parallel Blade with Ground
154:
131:
39:AC power plugs and sockets
36:
29:
3930:Hubbell Corporate History
3919:Hubbell Corporate History
3710:. Allworth. p. 133.
3574:"Hubbell catalog, NEMA 2"
3189:Underwriters Laboratories
1496:
1493:
1490:
1487:
1484:
1481:
1478:
1475:
1470:
1467:
1464:
1461:
1458:
1444:
1441:
1337:
1334:
1230:
1227:
1114:
1111:
1108:
1105:
1102:
1091:
1088:
1085:
999:
996:
993:
936:
925:
922:
919:
904:
901:
890:
887:
884:
801:
798:
795:
712:
709:
706:
623:
620:
617:
614:
611:
588:
585:
582:
579:
518:
515:
512:
509:
408:
405:
402:
399:
396:
393:
390:
384:
377:
195:Some of Hubbel's patents:
4282:Electrical installations
3198:Defense Logistics Agency
3194:National Electrical Code
3160:Canadian Electrical Code
3102:National Electrical Code
2988:residual-current devices
2665:Twist-locking connectors
2469:" connections of larger
2247:'s IEC 60906-2 standard
2110:polarized or unpolarized
1836:Canadian Electrical Code
1832:National Electrical Code
1600:240 V (split-phase)
94:ratings from 125 to 600
4255:Cauldwell, Rex (2002).
3704:Campbell, Drew (2002).
3430:www.plugsocketmuseum.nl
3406:www.plugsocketmuseum.nl
1931:; the neutral blade is
1677:
1666:
1653:120/240 V (split-
1556:
1552:
1538:
1471:240/415 V service
1468:347/600 V service
1465:277/480 V service
65:power plugs and sockets
4399:Mains power connectors
4334:W-C-596 (2014-05-25).
3737:Box, Harry C. (2003).
3323:Technology and Culture
2983:
2966:
2910:
2634:
2376:
2129:
2121:
2113:
1822:Non-locking connectors
1657:120/208 V (wye)
288:
86:ratings from 15 to 60
57:
48:
4294:UL 498 (2010-05-18).
3825:electriccarpledge.com
3308:U.S. patent 0,251,554
2981:
2943:
2908:
2632:
2471:recreational vehicles
2370:
2127:
2119:
2107:
323:recreational vehicles
286:
246:U.S. patent 1,180,648
229:U.S. patent 1,064,833
187:U.S. patent 1,180,648
181:U.S. patent 1,064,833
54:
46:
4404:Mechanical standards
2671:Hubbell Incorporated
2643:recreational vehicle
2238:lighting technicians
1767:hot–hot–hot–neutral
4380:at generatorjoe.net
4130:on 21 February 2007
3658:Child outlet safety
3167:corrosion-resistant
1459:Pole configuration
1455:
374:
349:Internet phenomenon
212:U.S. patent 774,250
172:U.S. patent 774,251
166:U.S. patent 774,250
4072:on 7 December 2008
4026:"GFCIs Fact Sheet"
3972:on 22 October 2020
3900:www.stayonline.com
3801:. Lincoln Electric
3665:on 22 January 2009
3638:on 2 December 2013
3130:de facto standards
3061:voltage transients
2984:
2967:
2911:
2635:
2377:
2130:
2122:
2114:
1715:240 V (delta)
1451:
372:
289:
58:
49:
4241:978-1-77139-718-6
3183:Related standards
3149:surge suppressors
3082:impact resistance
2619:
2618:
2452:split-phase power
2445:electric vehicles
2294:charging stations
1918:upward compatible
1819:
1818:
1449:
1448:
72:mains electricity
18:Duplex receptacle
16:(Redirected from
4416:
4360:
4359:
4353:
4345:
4343:
4342:
4331:
4325:
4324:
4318:
4310:
4308:
4307:
4298:. Archived from
4291:
4285:
4279:
4273:
4272:
4252:
4246:
4245:
4228:
4222:
4221:
4219:
4218:
4203:
4197:
4196:
4194:
4192:
4178:
4172:
4171:
4169:
4167:
4157:
4149:
4143:
4139:
4137:
4135:
4129:
4122:
4114:
4108:
4107:
4105:
4103:
4088:
4082:
4081:
4079:
4077:
4071:
4064:
4056:
4047:
4046:
4044:
4043:
4037:
4030:
4022:
4013:
4012:
4010:
4008:
4002:
3995:
3987:
3981:
3980:
3978:
3977:
3971:
3965:. Archived from
3964:
3956:
3950:
3945:
3939:
3927:
3921:
3916:
3910:
3909:
3907:
3906:
3892:
3886:
3885:
3884:. June 24, 2021.
3878:
3872:
3871:
3869:
3867:
3852:
3846:
3841:
3835:
3834:
3832:
3831:
3817:
3811:
3810:
3808:
3806:
3791:
3785:
3784:
3782:
3781:
3767:
3761:
3760:
3758:
3757:
3734:
3728:
3727:
3725:
3724:
3701:
3695:
3680:
3674:
3673:
3672:
3670:
3661:, archived from
3653:
3647:
3646:
3645:
3643:
3637:
3631:, archived from
3630:
3620:
3614:
3613:
3612:
3610:
3598:
3592:
3587:
3581:
3580:
3578:
3570:
3564:
3563:
3556:
3550:
3545:
3539:
3538:
3536:
3535:
3520:
3514:
3513:
3511:
3509:
3494:
3488:
3487:
3476:
3470:
3469:
3457:
3451:
3446:
3440:
3439:
3437:
3436:
3422:
3416:
3415:
3413:
3412:
3398:
3392:
3391:
3389:
3388:
3373:
3367:
3361:
3355:
3354:
3318:
3312:
3310:
3304:
3298:
3297:
3295:
3294:
3281:
3266:
3265:
3258:
3065:electrical noise
3036:AFCI receptacles
2964:
2963:
2959:
2954:
2953:
2949:
2614:
2611:
2593:
2586:
2518:
2506:
2494:
2480:charging station
2320:
2308:
2268:
2267:
2263:
2185:
2184:
2180:
2172:
2171:
2167:
2162:
2161:
2157:
2152:
2151:
2147:
2142:
2141:
2137:
2064:
2052:
2040:
2027:
2015:
2003:
1991:
1950:
1949:
1945:
1940:
1939:
1935:
1904:
1903:
1899:
1894:
1893:
1889:
1884:
1883:
1879:
1874:
1873:
1869:
1860:double-insulated
1717:208 V (wye)
1650:hot–hot–neutral
1602:208 V (wye)
1456:
1437:
1428:
1419:
1410:
1401:
1392:
1383:
1374:
1365:
1356:
1330:
1321:
1312:
1303:
1294:
1285:
1276:
1267:
1258:
1249:
1223:
1214:
1205:
1196:
1187:
1178:
1169:
1160:
1151:
1142:
1081:
1072:
1063:
1054:
1045:
1036:
1027:
1018:
989:
980:
971:
962:
953:
944:
880:
871:
862:
853:
844:
835:
826:
817:
791:
782:
773:
764:
755:
746:
737:
728:
702:
693:
684:
675:
666:
657:
648:
639:
575:
566:
557:
548:
539:
505:
491:
477:
468:
375:
367:Westford Academy
354:Outlet challenge
248:
241:
231:
224:
214:
207:
189:
183:
174:
168:
108:CSA C22.2 No. 42
21:
4424:
4423:
4419:
4418:
4417:
4415:
4414:
4413:
4389:
4388:
4374:at mahonkin.com
4368:
4363:
4346:
4340:
4338:
4333:
4332:
4328:
4311:
4305:
4303:
4293:
4292:
4288:
4280:
4276:
4269:
4254:
4253:
4249:
4242:
4230:
4229:
4225:
4216:
4214:
4205:
4204:
4200:
4190:
4188:
4180:
4179:
4175:
4165:
4163:
4155:
4151:
4150:
4146:
4133:
4131:
4127:
4120:
4116:
4115:
4111:
4101:
4099:
4098:on 25 July 2011
4090:
4089:
4085:
4075:
4073:
4069:
4062:
4058:
4057:
4050:
4041:
4039:
4035:
4028:
4024:
4023:
4016:
4006:
4004:
4003:on 12 July 2011
4000:
3993:
3989:
3988:
3984:
3975:
3973:
3969:
3962:
3958:
3957:
3953:
3946:
3942:
3937:Wayback Machine
3928:
3924:
3917:
3913:
3904:
3902:
3894:
3893:
3889:
3880:
3879:
3875:
3865:
3863:
3862:on 20 June 2013
3854:
3853:
3849:
3842:
3838:
3829:
3827:
3819:
3818:
3814:
3804:
3802:
3793:
3792:
3788:
3779:
3777:
3775:webstore.iec.ch
3769:
3768:
3764:
3755:
3753:
3751:
3736:
3735:
3731:
3722:
3720:
3718:
3703:
3702:
3698:
3681:
3677:
3668:
3666:
3655:
3654:
3650:
3641:
3639:
3635:
3628:
3622:
3621:
3617:
3608:
3606:
3600:
3599:
3595:
3588:
3584:
3576:
3572:
3571:
3567:
3558:
3557:
3553:
3546:
3542:
3533:
3531:
3522:
3521:
3517:
3507:
3505:
3496:
3495:
3491:
3478:
3477:
3473:
3459:
3458:
3454:
3447:
3443:
3434:
3432:
3424:
3423:
3419:
3410:
3408:
3400:
3399:
3395:
3386:
3384:
3375:
3374:
3370:
3362:
3358:
3335:10.2307/3105384
3320:
3319:
3315:
3306:
3305:
3301:
3292:
3290:
3283:
3282:
3269:
3260:
3259:
3255:
3251:
3211:
3185:
3176:
3174:Break-away tabs
3142:isolated ground
3122:
3098:
3078:
3057:
3055:Surge protector
3051:
3038:
3014:
2976:
2970:are available.
2961:
2957:
2956:
2951:
2947:
2946:
2938:
2929:
2920:
2903:
2894:
2885:
2877:
2869:
2861:
2853:
2841:
2832:
2823:
2814:
2805:
2797:
2789:
2781:
2760:
2751:
2743:
2735:
2727:
2711:
2692:
2667:
2627:
2615:
2609:
2606:
2599:needs expansion
2584:
2575:
2566:
2557:
2548:
2539:
2534:
2533:
2532:
2529:
2519:
2510:
2507:
2498:
2495:
2440:
2431:
2422:
2413:
2365:
2356:
2347:
2338:
2333:
2332:
2331:
2328:
2321:
2312:
2309:
2265:
2261:
2260:
2256:
2182:
2178:
2177:
2169:
2165:
2164:
2159:
2155:
2154:
2149:
2145:
2144:
2139:
2135:
2134:
2102:
2093:
2084:
2075:
2068:
2065:
2056:
2053:
2044:
2041:
2032:
2028:
2019:
2016:
2007:
2004:
1995:
1992:
1947:
1943:
1942:
1937:
1933:
1932:
1922:leakage current
1901:
1897:
1896:
1891:
1887:
1886:
1881:
1877:
1876:
1871:
1867:
1866:
1852:
1824:
1716:
1656:
1601:
1454:
1438:
1429:
1420:
1411:
1402:
1393:
1384:
1375:
1366:
1357:
1331:
1322:
1313:
1304:
1295:
1286:
1277:
1268:
1259:
1250:
1224:
1215:
1206:
1197:
1188:
1179:
1170:
1161:
1152:
1143:
1082:
1073:
1064:
1055:
1046:
1037:
1028:
1019:
990:
981:
972:
963:
954:
945:
881:
872:
863:
854:
845:
836:
827:
818:
792:
783:
774:
765:
756:
747:
738:
729:
703:
694:
685:
676:
667:
658:
649:
640:
576:
567:
558:
549:
540:
506:
492:
478:
469:
359:electric sparks
319:travel trailers
281:
269:
260:
255:
254:
253:
250:
244:
242:
233:
227:
225:
216:
210:
208:
197:
196:
185:
179:
170:
164:
157:
136:
130:
61:NEMA connectors
41:
35:
28:
23:
22:
15:
12:
11:
5:
4422:
4420:
4412:
4411:
4409:NEMA standards
4406:
4401:
4391:
4390:
4387:
4386:
4381:
4375:
4367:
4366:External links
4364:
4362:
4361:
4326:
4286:
4274:
4267:
4258:Wiring a house
4247:
4240:
4223:
4198:
4173:
4160:cdn.ez-pdh.com
4144:
4109:
4083:
4048:
4014:
3982:
3951:
3940:
3922:
3911:
3887:
3873:
3847:
3836:
3812:
3786:
3762:
3749:
3729:
3716:
3696:
3682:Drew Campbell
3675:
3648:
3615:
3593:
3582:
3565:
3551:
3540:
3515:
3489:
3471:
3452:
3441:
3417:
3393:
3368:
3356:
3329:(3): 525–543.
3313:
3299:
3267:
3252:
3250:
3247:
3246:
3245:
3240:
3234:
3228:
3223:
3217:
3210:
3207:
3184:
3181:
3175:
3172:
3171:
3170:
3163:
3152:
3145:
3138:
3121:
3118:
3097:
3094:
3077:
3074:
3050:
3047:
3037:
3034:
3013:
3010:
2975:
2972:
2937:
2934:
2928:
2925:
2919:
2916:
2902:
2899:
2893:
2890:
2884:
2881:
2876:
2873:
2868:
2865:
2860:
2857:
2852:
2849:
2840:
2837:
2831:
2828:
2822:
2819:
2813:
2810:
2804:
2801:
2796:
2793:
2788:
2785:
2780:
2777:
2759:
2756:
2750:
2747:
2742:
2741:NEMA L3 and L4
2739:
2734:
2731:
2726:
2723:
2722:
2721:
2718:
2710:
2707:
2706:
2705:
2702:
2699:
2691:
2688:
2666:
2663:
2639:Travel Trailer
2626:
2623:
2617:
2616:
2596:
2594:
2583:
2580:
2574:
2571:
2565:
2562:
2556:
2553:
2547:
2544:
2538:
2535:
2531:
2530:
2520:
2513:
2511:
2508:
2501:
2499:
2496:
2489:
2486:
2485:
2484:
2439:
2436:
2430:
2427:
2421:
2418:
2412:
2409:
2389:kitchen ranges
2385:clothes dryers
2364:
2361:
2355:
2352:
2346:
2343:
2337:
2334:
2330:
2329:
2322:
2315:
2313:
2310:
2303:
2300:
2299:
2298:
2255:
2252:
2214:stage lighting
2199:extension cord
2101:
2098:
2092:
2089:
2083:
2080:
2074:
2071:
2070:
2069:
2066:
2059:
2057:
2054:
2047:
2045:
2042:
2035:
2033:
2029:
2022:
2020:
2017:
2010:
2008:
2005:
1998:
1996:
1993:
1986:
1851:
1848:
1823:
1820:
1817:
1816:
1813:
1810:
1809:240/415 V
1807:
1802:
1797:
1796:347/600 V
1794:
1789:
1784:
1783:277/480 V
1781:
1776:
1771:
1770:120/208 V
1768:
1764:
1763:
1760:
1757:
1754:
1749:
1744:
1741:
1736:
1731:
1728:
1723:
1718:
1713:
1709:
1708:
1705:
1702:
1701:240/415 V
1699:
1696:
1693:
1692:347/600 V
1690:
1687:
1684:
1683:277/480 V
1681:
1670:
1659:
1651:
1647:
1646:
1643:
1640:
1637:
1632:
1627:
1624:
1619:
1616:
1613:
1608:
1603:
1598:
1594:
1593:
1590:
1587:
1584:
1579:
1576:
1573:
1568:
1563:
1560:
1541:
1532:
1529:
1525:
1524:
1521:
1518:
1515:
1512:
1509:
1506:
1503:
1499:
1498:
1495:
1492:
1489:
1486:
1483:
1480:
1477:
1473:
1472:
1469:
1466:
1463:
1460:
1452:
1447:
1446:
1443:
1440:
1431:
1422:
1413:
1404:
1395:
1386:
1377:
1368:
1359:
1350:
1347:
1340:
1339:
1336:
1333:
1324:
1315:
1306:
1297:
1288:
1279:
1270:
1261:
1252:
1243:
1240:
1233:
1232:
1229:
1226:
1217:
1208:
1199:
1190:
1181:
1172:
1163:
1154:
1145:
1136:
1133:
1129:
1128:
1125:
1122:
1119:
1116:
1113:
1110:
1107:
1104:
1101:
1098:
1094:
1093:
1090:
1087:
1084:
1075:
1066:
1057:
1048:
1039:
1030:
1021:
1012:
1009:
1002:
1001:
998:
995:
992:
983:
974:
965:
956:
947:
938:
935:
932:
928:
927:
924:
921:
918:
915:
912:
909:
906:
903:
900:
897:
893:
892:
889:
886:
883:
874:
865:
856:
847:
838:
829:
820:
811:
808:
804:
803:
800:
797:
794:
785:
776:
767:
758:
749:
740:
731:
722:
719:
715:
714:
711:
708:
705:
696:
687:
678:
669:
660:
651:
642:
633:
630:
626:
625:
622:
619:
616:
613:
610:
607:
604:
601:
598:
595:
591:
590:
587:
584:
581:
578:
569:
560:
551:
542:
533:
528:
525:
521:
520:
517:
514:
511:
508:
499:
494:
485:
480:
471:
462:
459:
455:
454:
451:
448:
445:
442:
439:
436:
433:
430:
427:
424:
421:
418:
415:
411:
410:
407:
404:
401:
398:
395:
392:
389:
383:
280:
277:
268:
265:
259:
256:
252:
251:
243:
236:
234:
226:
219:
217:
209:
202:
199:
198:
194:
193:
192:
161:Harvey Hubbell
156:
153:
142:developed the
132:Main article:
129:
126:
112:NMX-J-163-ANCE
37:Main article:
26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
4421:
4410:
4407:
4405:
4402:
4400:
4397:
4396:
4394:
4385:
4382:
4379:
4376:
4373:
4370:
4369:
4365:
4357:
4351:
4337:
4330:
4327:
4322:
4316:
4302:on 2014-07-04
4301:
4297:
4290:
4287:
4283:
4278:
4275:
4270:
4268:9781561585274
4264:
4260:
4259:
4251:
4248:
4243:
4237:
4233:
4227:
4224:
4213:
4209:
4202:
4199:
4187:
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4161:
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4142:
4126:
4119:
4113:
4110:
4097:
4093:
4087:
4084:
4068:
4061:
4055:
4053:
4049:
4038:on 2010-12-15
4034:
4027:
4021:
4019:
4015:
3999:
3992:
3986:
3983:
3968:
3961:
3955:
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3816:
3813:
3800:
3796:
3790:
3787:
3776:
3772:
3766:
3763:
3752:
3750:0-240-80495-3
3746:
3742:
3741:
3733:
3730:
3719:
3717:1-58115-229-9
3713:
3709:
3708:
3700:
3697:
3693:
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3685:
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3552:
3549:
3544:
3541:
3529:
3525:
3519:
3516:
3503:
3499:
3493:
3490:
3486:. 2020-01-21.
3485:
3481:
3475:
3472:
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3456:
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3208:
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3168:
3164:
3161:
3157:
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3143:
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3133:
3131:
3126:
3119:
3117:
3115:
3111:
3107:
3103:
3095:
3093:
3089:
3087:
3083:
3075:
3073:
3071:
3066:
3062:
3056:
3048:
3046:
3042:
3035:
3033:
3031:
3025:
3023:
3019:
3011:
3009:
3006:
3004:
3003:daisy-chained
2998:
2996:
2991:
2989:
2980:
2973:
2971:
2942:
2935:
2933:
2926:
2924:
2917:
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2800:
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2658:
2654:
2652:
2648:
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2640:
2631:
2624:
2622:
2613:
2604:
2600:
2597:This section
2595:
2592:
2588:
2587:
2581:
2579:
2572:
2570:
2563:
2561:
2554:
2552:
2545:
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2505:
2500:
2493:
2488:
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2481:
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2468:
2464:
2459:
2457:
2453:
2448:
2446:
2437:
2435:
2428:
2426:
2419:
2417:
2410:
2408:
2406:
2405:grandfathered
2400:
2396:
2394:
2393:safety ground
2390:
2386:
2382:
2374:
2369:
2362:
2360:
2353:
2351:
2344:
2342:
2335:
2326:
2319:
2314:
2307:
2302:
2297:
2295:
2291:
2287:
2281:
2279:
2275:
2270:
2253:
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2250:
2246:
2241:
2239:
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2231:
2227:
2223:
2219:
2215:
2210:
2206:
2202:
2200:
2195:
2190:
2187:
2174:
2126:
2118:
2111:
2106:
2099:
2097:
2090:
2088:
2081:
2079:
2072:
2063:
2058:
2051:
2046:
2039:
2034:
2026:
2021:
2014:
2009:
2002:
1997:
1990:
1985:
1983:
1980:
1978:
1974:
1968:
1964:
1962:
1958:
1954:
1930:
1925:
1923:
1919:
1914:
1912:
1906:
1863:
1861:
1857:
1849:
1847:
1845:
1841:
1837:
1833:
1828:
1821:
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1729:
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1697:
1694:
1691:
1688:
1685:
1682:
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1679:
1674:
1671:
1669:
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1658:
1652:
1649:
1648:
1644:
1641:
1638:
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1633:
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1620:
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1614:
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1609:
1607:
1604:
1599:
1596:
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1522:
1519:
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1507:
1504:
1501:
1500:
1474:
1457:
1436:
1432:
1427:
1423:
1418:
1414:
1409:
1405:
1400:
1396:
1391:
1387:
1382:
1378:
1373:
1369:
1364:
1360:
1355:
1351:
1348:
1346:
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1341:
1329:
1325:
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1311:
1307:
1302:
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1293:
1289:
1284:
1280:
1275:
1271:
1266:
1262:
1257:
1253:
1248:
1244:
1241:
1239:
1235:
1234:
1222:
1218:
1213:
1209:
1204:
1200:
1195:
1191:
1186:
1182:
1177:
1173:
1168:
1164:
1159:
1155:
1150:
1146:
1141:
1137:
1134:
1131:
1130:
1126:
1123:
1120:
1117:
1099:
1096:
1095:
1080:
1076:
1071:
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1062:
1058:
1053:
1049:
1044:
1040:
1035:
1031:
1026:
1022:
1017:
1013:
1010:
1008:
1004:
1003:
988:
984:
979:
975:
970:
966:
961:
957:
952:
948:
943:
939:
933:
930:
929:
916:
913:
910:
907:
898:
895:
894:
879:
875:
870:
866:
861:
857:
852:
848:
843:
839:
834:
830:
825:
821:
816:
812:
809:
806:
805:
790:
786:
781:
777:
772:
768:
763:
759:
754:
750:
745:
741:
736:
732:
727:
723:
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717:
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701:
697:
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688:
683:
679:
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670:
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661:
656:
652:
647:
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638:
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631:
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627:
608:
605:
602:
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596:
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592:
574:
570:
565:
561:
556:
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467:
463:
460:
457:
456:
452:
449:
446:
443:
440:
437:
434:
431:
428:
425:
422:
419:
416:
413:
412:
388:
382:
381:
376:
370:
368:
364:
360:
356:
355:
351:known as the
350:
345:
341:
339:
335:
330:
328:
324:
320:
315:
311:
307:
304:
301:
296:
292:
285:
278:
276:
274:
271:In 1926, the
266:
264:
257:
247:
240:
235:
230:
223:
218:
213:
206:
201:
191:
188:
182:
176:
173:
167:
162:
152:
149:
145:
141:
140:Thomas Edison
135:
127:
125:
122:
119:
117:
114:) and Japan (
113:
109:
103:
101:
97:
93:
89:
85:
81:
77:
76:North America
73:
70:
66:
62:
53:
45:
40:
33:
19:
4339:. Retrieved
4329:
4304:. Retrieved
4300:the original
4289:
4277:
4257:
4250:
4231:
4226:
4215:. Retrieved
4212:www.nema.org
4211:
4201:
4189:. Retrieved
4185:
4176:
4164:. Retrieved
4159:
4147:
4132:. Retrieved
4125:the original
4112:
4100:. Retrieved
4096:the original
4086:
4074:. Retrieved
4067:the original
4040:. Retrieved
4033:the original
4005:. Retrieved
3998:the original
3985:
3974:. Retrieved
3967:the original
3954:
3943:
3925:
3914:
3903:. Retrieved
3899:
3890:
3876:
3864:. Retrieved
3860:the original
3850:
3839:
3828:. Retrieved
3824:
3815:
3803:. Retrieved
3798:
3789:
3778:. Retrieved
3774:
3765:
3754:. Retrieved
3739:
3732:
3721:. Retrieved
3706:
3699:
3683:
3678:
3667:, retrieved
3663:the original
3657:
3651:
3640:, retrieved
3633:the original
3624:
3618:
3607:, retrieved
3602:
3596:
3585:
3568:
3559:
3554:
3543:
3532:. Retrieved
3518:
3506:. Retrieved
3504:. 2020-01-25
3501:
3492:
3483:
3474:
3465:
3455:
3444:
3433:. Retrieved
3429:
3420:
3409:. Retrieved
3405:
3396:
3385:. Retrieved
3383:. 2020-03-06
3380:
3371:
3359:
3326:
3322:
3316:
3302:
3291:. Retrieved
3285:
3261:
3256:
3186:
3177:
3159:
3127:
3123:
3108:(LCDI) or a
3099:
3090:
3079:
3070:power strips
3058:
3043:
3039:
3026:
3015:
3007:
2999:
2995:milliamperes
2992:
2985:
2968:
2930:
2921:
2912:
2895:
2886:
2878:
2870:
2862:
2854:
2846:
2842:
2833:
2824:
2815:
2806:
2798:
2790:
2782:
2773:
2767:systems and
2765:
2761:
2752:
2744:
2736:
2728:
2712:
2693:
2684:
2680:
2668:
2659:
2655:
2646:
2636:
2620:
2610:October 2023
2607:
2603:adding to it
2598:
2576:
2567:
2558:
2549:
2540:
2475:mobile homes
2460:
2449:
2443:charging of
2441:
2432:
2423:
2414:
2401:
2397:
2378:
2357:
2348:
2339:
2282:
2271:
2257:
2248:
2242:
2233:
2229:
2225:
2221:
2217:
2211:
2207:
2203:
2191:
2188:
2175:
2131:
2094:
2085:
2076:
1981:
1969:
1965:
1957:Cheater plug
1926:
1915:
1907:
1864:
1856:non-coplanar
1853:
1843:
1829:
1825:
1712:hot–hot–hot
1676:
1665:
1654:
1551:
1528:hot–neutral
1453:NEMA classes
1344:
1237:
1006:
530:
496:
482:
386:
379:
352:
346:
342:
331:
316:
312:
308:
305:
297:
293:
290:
279:Nomenclature
270:
261:
177:
158:
147:
144:Edison screw
137:
123:
120:
115:
111:
110:), Mexico (
107:
104:
60:
59:
4284:Winnipeg.ca
3805:29 February
3642:19 November
2817:Electric).
2675:generically
2467:shore power
2456:three-phase
2278:split-phase
2274:three-phase
1953:AC adapters
1345:120/ 208 V
1132:125/ 250 V
1097:150/ 300 V
931:125/ 250 V
409:90 A (72)
406:70 A (56)
403:60 A (48)
400:50 A (40)
397:30 A (24)
327:shore power
300:three-phase
163:filled the
4393:Categories
4378:NEMA Chart
4372:NEMA Chart
4341:2014-07-06
4306:2014-07-06
4217:2016-03-26
4166:18 October
4134:18 October
4102:18 October
4076:18 October
4042:2010-05-04
4007:18 October
3976:2019-05-11
3905:2024-04-29
3830:2023-06-21
3780:2016-04-13
3756:2010-02-16
3723:2010-02-16
3692:1581159986
3669:21 January
3534:2010-02-17
3508:5 November
3484:NBC Boston
3435:2022-09-30
3411:2022-09-30
3387:2022-09-30
3293:2021-08-15
3249:References
3120:Color code
3114:power cord
3053:See also:
2625:NEMA TT-30
2482:purposes.
2381:deprecated
2373:deprecated
2286:arc welder
1756:415 V
1743:600 V
1730:480 V
1639:415 V
1626:600 V
1615:480 V
1586:240 V
1575:347 V
1562:277 V
1531:120 V
1127:288-4-72P
1124:288-4-72S
1121:288-4-56P
1118:288-4-56S
917:144-3-40P
914:144-3-40S
911:144-3-24P
908:144-3-24S
609:144-2-16P
606:144-2-16S
603:144-2-12P
600:144-2-12S
394:20 A (16)
391:15 A (12)
363:evacuation
321:and other
128:Precedents
116:JIS C 8303
90:(A), with
56:buildings.
3694:Chapter 9
3377:"History"
3351:112928824
3231:IEC 60320
3086:corrosion
2031:contacts.
1961:spade lug
1929:polarized
1497:Grounded
1491:Grounded
1485:Grounded
1479:Grounded
159:In 1903,
100:grounding
67:used for
32:Twistlock
4350:cite web
4315:cite web
4162:. EZ-pdh
3933:Archived
3528:Archived
3502:ABC News
3209:See also
2927:NEMA L23
2918:NEMA L22
2901:NEMA L21
2892:NEMA L20
2883:NEMA L19
2875:NEMA L18
2867:NEMA L17
2859:NEMA L16
2851:NEMA L15
2839:NEMA L14
2830:NEMA L13
2821:NEMA L12
2812:NEMA L11
2803:NEMA L10
2651:RV parks
2463:RV parks
2371:The now-
2327:unloader
2226:U-ground
1834:nor the
1597:hot–hot
1494:Voltage
1488:Voltage
1482:Voltage
1476:Voltage
334:padlocks
148:de facto
102:system.
4191:May 28,
3795:"AC225"
3343:3105384
3220:BS 1363
3030:choking
2960:⁄
2950:⁄
2795:NEMA L9
2787:NEMA L8
2779:NEMA L7
2771:units.
2758:NEMA L6
2749:NEMA L5
2733:NEMA L2
2725:NEMA L1
2582:NEMA 24
2573:NEMA 23
2564:NEMA 22
2555:NEMA 21
2546:NEMA 20
2537:NEMA 15
2438:NEMA 14
2429:NEMA 13
2420:NEMA 12
2411:NEMA 11
2363:NEMA 10
2264:⁄
2259:spaced
2234:Hubbell
2181:⁄
2168:⁄
2158:⁄
2148:⁄
2138:⁄
1946:⁄
1936:⁄
1900:⁄
1890:⁄
1880:⁄
1870:⁄
1439:18-60P
1430:18-60R
1421:18-50P
1412:18-50R
1403:18-30P
1394:18-30R
1385:18-20P
1376:18-20R
1367:18-15P
1358:18-15R
1332:15-60P
1323:15-60R
1314:15-50P
1305:15-50R
1296:15-30P
1287:15-30R
1278:15-20P
1269:15-20R
1260:15-15P
1251:15-15R
1225:14-60P
1216:14-60R
1207:14-50P
1198:14-50R
1189:14-30P
1180:14-30R
1171:14-20P
1162:14-20R
1153:14-15P
1144:14-15R
1083:11-50P
1074:11-50R
1065:11-30P
1056:11-30R
1047:11-20P
1038:11-20R
1029:11-15P
1020:11-15R
991:10-50P
982:10-50R
973:10-30P
964:10-30R
955:10-20P
946:10-20R
450:Socket
444:Socket
438:Socket
432:Socket
426:Socket
420:Socket
414:Socket
338:lockout
92:voltage
88:amperes
84:current
4265:
4238:
4206:NEMA.
3866:7 June
3747:
3714:
3690:
3609:20 May
3466:Forbes
3349:
3341:
3196:. The
3158:. The
3018:listed
2354:NEMA 9
2345:NEMA 8
2336:NEMA 7
2254:NEMA 6
2230:Edison
2100:NEMA 5
2091:NEMA 4
2082:NEMA 3
2073:NEMA 2
1850:NEMA 1
1655:phase)
1238:250 V
1007:250 V
896:150 V
882:7-50P
873:7-50R
864:7-30P
855:7-30R
846:7-20P
837:7-20R
828:7-15P
819:7-15R
807:277 V
793:6-50P
784:6-50R
775:6-30P
766:6-30R
757:6-20P
748:6-20R
739:6-15P
730:6-15R
718:250 V
704:5-50P
695:5-50R
686:5-30P
677:5-30R
668:5-20P
659:5-20R
650:5-15P
641:5-15R
629:125 V
594:150 V
577:2-30P
568:2-30R
559:2-20P
550:2-20R
541:2-15P
524:250 V
507:1-30P
493:1-20P
479:1-15P
470:1-15R
458:125 V
4156:(PDF)
4128:(PDF)
4121:(PDF)
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4001:(PDF)
3994:(PDF)
3970:(PDF)
3963:(PDF)
3799:AC225
3636:(PDF)
3629:(PDF)
3577:(PDF)
3347:S2CID
3339:JSTOR
2647:RV 30
531:6-15R
497:5-30R
483:5-20R
453:Plug
447:Plug
441:Plug
435:Plug
429:Plug
423:Plug
417:Plug
96:volts
4356:link
4321:link
4263:ISBN
4236:ISBN
4193:2024
4168:2020
4136:2009
4104:2009
4078:2009
4009:2009
3868:2013
3807:2024
3745:ISBN
3712:ISBN
3688:ISBN
3671:2009
3644:2013
3611:2017
3510:2020
3381:NEMA
3200:and
3063:and
3022:NFPA
2325:silo
2290:silo
2192:The
1973:METI
1523:yes
1343:3ΦY
267:NEMA
63:are
3331:doi
2769:UPS
2605:.
2276:or
2232:or
2224:),
2218:PBG
2212:In
1977:JIS
1975:or
1842:'s
1815:26
1678:SS2
1667:ML3
1592:25
1557:ML2
1553:SS1
1539:ML1
1517:yes
1511:yes
1505:yes
1349:18
1242:15
1236:3Φ
1135:14
1100:12
1011:11
1005:3Φ
934:10
387:MA
385:NE
365:in
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2266:32
2262:23
2228:,
2170:32
2166:15
2140:16
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1948:16
1938:16
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1888:23
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1800:20
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1520:no
1514:no
1508:no
1502:no
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