NEMA connector - Knowledge

2258: 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. 2051: 2307: 211: 1956:

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.

228: 194: 264:(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. 2968: 2014: 2930: 3352:[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: 2027: 2493: 2505: 1990: 2002: 3034:

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.

273: 3105:. 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. 2114: 2895: 2175: 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. 158:, 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 2580: 2094: 2295: 2106: 2039: 33: 41: 1978: 2743:

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.

2481: 2979:, 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. 1424: 1415: 1406: 1397: 1388: 1379: 1370: 1361: 1352: 1343: 1317: 1308: 1299: 1290: 1281: 1272: 1263: 1254: 1245: 1236: 1210: 1201: 1192: 1183: 1174: 1165: 1156: 1147: 1138: 1129: 1068: 1059: 1050: 1041: 1032: 1023: 1014: 1005: 976: 967: 958: 949: 940: 931: 867: 858: 849: 840: 831: 822: 813: 804: 778: 769: 760: 751: 742: 733: 724: 715: 689: 680: 671: 662: 653: 644: 635: 626: 562: 553: 544: 535: 526: 492: 478: 464: 455: 2619: 1940: 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 1835:(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). 2380:, 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 3133:(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. 2225:, 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, 3017:

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

2013: 2436:. 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. 2986:. 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. 2388:

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.

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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

3033:

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

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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

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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

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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

2548:

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

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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

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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'

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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

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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,

1955:

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

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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

3125:

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

3029:

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

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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

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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

2197:

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

3300:(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. 2755:

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

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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

2431:

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

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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

3016:

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

1815:

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

2902:

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

1897:

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

2329:

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

2805:

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

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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

1959:

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

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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

329:" 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. 2989:

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

2742:

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

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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.

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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

3113:

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

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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).

2876:

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).

2193:

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.

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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

2751:

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.

2814:

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).

3030:

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.

44:

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

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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.

2357: 94:

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

2272:

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

1898:

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

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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.

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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.

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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.

302:

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.

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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.

2823:

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).

2422:

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.

2413:

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.

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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).

3180:

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

2084:

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.

3516: 2539:

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.

2832:

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.

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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

2920:

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.

2911:

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.

2347:

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.

2338:

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.

2530:

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.

3077:. 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. 2903:

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.

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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.

2075:

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.

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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

2019:

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

2763:

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.

2404:

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.

87:(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 2121:

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

3354:

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

2649:

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.

2933:

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

3168:

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".

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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

4170: 2772:

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.

3512: 2392:

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 "

1971:

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.

193: 2050: 3094: 210: 2447:. 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. 2994:

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.

3009:

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

306:

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

2281:

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

173:

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

127:

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,

2671:

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.

2734:

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.

227: 1952:

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.

1847:

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

3948: 2504: 295:

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.

280:

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".

2269:

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.

2026: 1905:

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

2097:

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

2306: 2718:

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.

3225: 1916:

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

3562: 2238:

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.

2982:

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

2726:

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.

4048: 2001: 342: 3450: 2261:

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

4344: 4309: 287:

The numerals preceding the hyphen encode the number of poles (current-carrying terminals) and wires connected to it, the voltage, and single- or

3870: 4284: 3089:

Damaged power cords of portable air conditioners have caused many electrical fires, and about 350 deaths per year. To combat this, the 2017

2117:

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.

1909:

with modern grounded NEMA 5 receptacles. Standards permit ungrounded plugs where the appliance does not require grounding due to low risk of

1854:

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,

261: 68: 2285:, on a short cord, as the more versatile 14-50 with its fourth prong neutral not used currently for any electric vehicle charging purposes. 2667:

reliable connection in commercial and industrial settings, where vibration or incidental impact could disconnect a non-locking connector.

3783: 3612: 2997:

GFCIs are also recommended for power tool outlets and any locations where children might insert conductive objects into the receptacles.

1828: 2182: 2142: in (3.2 mm) longer than the power blades (so the device is grounded before the power is connected) and located from them by 3955: 2233: 3468: 2642:

in the United States and Canada, and all but the largest RVs manufactured since the 1970s use this plug to connect to power feeds.

2492: 2198:

neutral blades inserted simultaneously to release the small doors blocking the slots. The grounding slot is not blocked by a door.

1989: 4196: 3486: 1961: 3979: 2038: 336:

Criticism has been aimed at the design leaving a gap with exposed prongs. This safety flaw has been exploited by a January 2020

135:

in the early 1880s, for which he received a patent in 1881. The Edison screw was very successful, and quickly became the first

4270: 3069:

Weather-resistant (WR) receptacles are made with ultraviolet-resistant insulating materials having excellent cold-temperature

2971:

Tamper-resistant GFCI duplex receptacle type 5-20RA, which can take 5-15 and 5-20 grounding plugs and 1-15 non-grounding plugs

2658:

Twist-locking connectors were first invented by Harvey Hubbell III in 1938 and "Twist-Lock" remains a registered trademark of

2294: 4228: 4141: 3590: 122: 3844: 3061:. These devices provide point-of-use protection and are the last line of defense in a whole-house surge protection network. 2590: with: "24" is hot-linked elsewhere in this article but is not fully described anywhere in the article. You can help by 2165:

Compared to the 5-15P plug, the 5-20P plug has the neutral blade rotated 90° and shifted so its inner edge is approximately

3310:

Schroeder, Fred E. H. (1986-01-01). "More "Small Things Forgotten": Domestic Electrical Plugs and Receptacles, 1881-1931".

3010: 2991: 4106: 3921: 3117:

However, although colors are not standardized by NEMA, some industries utilize colors for certain applications, following

3832: 3214: 3884: 2683:

ML-series "Midget Locking" connectors are for 15 A applications where a larger locking connector would not fit.

2567:

however NEMA L23 series locking devices for 20- and 30-ampere devices specified and available for these applications.

2558:

however NEMA L22 series locking devices for 20- and 30-ampere devices specified and available for these applications.

2549:

however NEMA L21 series locking devices for 20- and 30-ampere devices specified and available for these applications.

1948:

adapters allow a "3-prong" grounded 5-15P plug to be mated to a non-grounded 1-15R receptacle. The adapters include a

4255: 3737: 3704: 2836:

These connectors are common on household backup generators, and on racks of power amplifiers in large audio systems.

1960:

dimensional requirements for the plug housing, different marking requirements, and mandatory testing and approval by

4080: 1977: 3098: 2439:

All NEMA 14 devices offer two hots, a neutral, and a ground, allowing for both 120 and 240 V when supplied by

4014: 2788:

NEMA L9 are two-pole and ground connectors rated for 600 V. Intended for three-wire hot-hot-ground circuits.

2780:

NEMA L8 are two-pole and ground connectors rated for 480 V. Intended for three-wire hot-hot-ground circuits.

2178:

The neutral blade on 5-15P plugs is not always wider than the line blade, since the ground pin enforces polarity.

4387: 3190: 3680: 3645: 1899: 4392: 2868:

NEMA L18 are four-pole no ground connectors rated for 120/208 V. Intended for wye three-phase circuits.

113:

The dimensional standard for electrical connectors is ANSI/NEMA WD-6 and is available from the NEMA website.

3907: 3073:

to withstand longterm exposure to weathering and abuse. Metallic components are required to be resistant to

3231: 2757: 1965: 4055: 3203: 2860:

NEMA L17 are three-pole and ground connectors rated for 600 V. Intended for three-phase circuits.

2852:

NEMA L16 are three-pole and ground connectors rated for 480 V. Intended for three-phase circuits.

2844:

NEMA L15 are three-pole and ground connectors rated for 250 V. Intended for three-phase circuits.

2444: 2440: 2266: 2262: 53: 27: 3151:

requires that "essential" receptacles in hospitals, connected to emergency power systems, must be red.

3177: 3006: 2591: 4372: 2610:

NEMA 24 Series devices are specified for two pole, three-wire grounding devices for 347V A/C power.

4245: 3251:

CSA Standard C22.2 No. 42-10: General use receptacles, attachment plugs, and similar wiring devices

3186: 3182: 3090: 3013:, the code change adds only $ 40 to the cost of building an average, 75-receptacle home in the US. 2364:

NEMA 10-30 has a neutral pin (at top of photo), but does not have a dedicated safety grounding pin.

2274: 1824: 1820: 4360: 4324: 4288: 3729:

Set Lighting Technician's Handbook: Film Lighting Equipment, Practice, and Electrical Distribution

3390: 4397: 3536: 2976: 2480: 3578: 3273: 3144: 2967: 2032:

A NEMA 1 cord from 1932, with wide protective face to prevent touching the electrical contacts.

284:

commercial equipment, where increased protection against accidental disconnection is required.

3621: 346:, where conductive materials, usually coins or paper clips were dropped into the gap, causing 4366: 2663: 311: 204:, fig. 1, illustrating a lightbulb socket adaptor and an attachable flat blade socket for it. 3176:

The dimensions and configurations for NEMA connectors are given in ANSI/NEMA standard WD-6.

2056:

Japanese socket having the narrowest socket face with grounding post, for an air conditioner

2659: 2631: 2459: 2381: 351: 88: 2929: 2372:

type that had formerly been popular in the United States for use with high-power electric

314:

to external power sources), SS series ("ship-to-shore" connectors for connecting boats to

8: 2226: 2098: 1819:

NEMA wall receptacles can be found installed in any orientation. Neither NEMA nor the US

337: 110:

Other plug and receptacle types are for special purposes or for heavy-duty applications.

57: 3093:(NEC) requires each portable air conditioner sold in the United States to have either a 2709:

SS2-50 connectors are three-pole with ground (hot-neutral-hot) rated for 125/250 V.

2702:

SS-series "Ship-to-shore" connectors are for 50 A marine shore-power applications.

2693:

ML-3 connectors are for three-pole no ground (hot-neutral-hot) rated for 125/250 V.

2229:

use these extension cords to deliver power to lights rated at 2,000 watts or less.

4221:

C22.1-15—Canadian Electrical Code, Part I: Safety Standard for Electrical Installations

3936: 3414: 3335: 3327: 3005:

Starting with the 2008 National Electrical Code and the 2009 Canadian Electrical Code,

19:"Twist-lock connector" redirects here. For the device used in intermodal shipping, see 179:. The flat blade plug which in subsequent years evolved to become NEMA 1-15 was born. 4338: 4303: 4251: 4224: 3986: 3733: 3700: 3676: 3339: 3129:

Per UL Standard ANSI/UL 498, a receptacle (any color) with an orange triangle, is an

3118: 3070: 2622:

NEMA TT-30 plug and receptacle. (The center hole on the receptacle is not a contact.)

2330:

L-shaped neutral, while the 7-50 has an enlarged neutral pin, compared with the hot.

2232:

Internationally, the NEMA 5-15P plug and NEMA 5-15R receptacle are the basis for the

1906: 1902:

for two-wire non-grounded configurations (when a ground conductor is not available).

60: 3809: 3513:"NFPA :: Research :: Charles S. Morgan Library :: FAQ/Facts and lore" 3319: 3143:

A red receptacle may indicate a special-service outlet such as one connected to an

3137: 3053: 2515: 2468: 2433: 2282: 1848: 355: 72: 3021:

hazard when removed), and to sliding covers that children easily learn to defeat.

3925: 3848: 3727: 3694: 3130: 3043: 1910: 333:

or two terminals, 'X' and 'Y'. Three-phase connectors will use 'X', 'Y' and 'Z'.

307: 3918: 221:, fig. 1 and 3. First patent showing the parallel blades which became NEMA 1-15. 3275:

ANSI/NEMA WD 6-2016: Wiring Devices – Dimensional Specifications

2627: 2393: 2202: 2187: 2113: 1917: 347: 326: 149: 3437: 234: 217: 175: 169: 4381: 3296: 3049: 2894: 2377: 2373: 200: 160: 154: 128: 64: 4129: 4113: 4021: 3154:

At least one manufacturer makes a yellow receptacle, which identifies it as

3048:

Surge protective devices are designed to reduce the random energy surges of

3759: 3549:

JIS C 8303-1993, Plugs and Receptacles for Domestic and Similar General Use

1945: 132: 3084: 167:

In 1910, Hubbel worked on improving his popular flat blade design, filled

4084: 3058: 2463: 2369: 2093: 1844: 315: 288: 3253:. Mississauga, Ontario: Canadian Standards Association. 2010. p. 1. 2579: 2105: 16:

Power plugs and receptacles used in North America and some other regions

4223:(23rd ed.). Canadian Standards Association. 2015. Rule 24–106(6). 3331: 3102: 2675:

in most cases by the connector having a robust integral strain relief.

2455: 2361: 2007:

AC adapter with integrated plug pins matching an unpolarized NEMA 1-15P

1941: 272: 3228:, which includes some non-NEMA plugs and sockets used in North America 3226:

Industrial and multiphase power plugs and sockets § North America

2962: 2205:

for film and theater, this connector is sometimes informally known as

32: 3980:"Tamper Resistant Receptacles: The New Standard of Electrical Safety" 3365: 3222:, an international standard for power "inlet" connectors on equipment 3219: 3155: 3074: 2511: 1949: 20: 3651: 3451:"What Is The 'Outlet Challenge'? How It Can Electrocute Or Burn You" 3323: 2954: in (13 mm), or by slightly-misplaced device box housings. 40: 3391:"Museum of Plugs and Sockets: history of British plugs and sockets" 2396:" installations remain common in older homes in the United States. 318:) and the FSL series (used in military and aircraft applications). 276:

NEMA receptacles, with their common US uses listed (in purple text)

3845:"TeslaMotors.com: Go Electric – Ready, Set, Charge" 3278:. National Electrical Manufacturer's Association. 2016. p. 17 2990:

retrofits on older installations where branch circuits were often

238:

fig. 4 and 5, showing a concept for polarized receptacle and plug.

3208: 3018: 2706:

SS1-50 connectors are two-pole with ground, rated for 125 V.

2639: 2451: 322: 299:

configuration and 125 V rating, but is rated for 30 A.

80: 3871:"Home EV charging: How to know which plug type is right for you" 2690:

ML-2 connectors are two-pole with ground, rated for 125 V.

2277:

also uses 6-50. Single-phase 6-50 is commonly used on farms for

2983: 2514:(9.6 kW sustained) on a 240 V circuit to recharge an 76: 3438:

e.g., US Patent 2,664,734, H.McEneaney, issued January 5, 1954

2687:

ML-1 connectors are two-pole, no ground, rated for 125 V.

1423: 1414: 1405: 1396: 1387: 1378: 1369: 1360: 1351: 1342: 1316: 1307: 1298: 1289: 1280: 1271: 1262: 1253: 1244: 1235: 1209: 1200: 1191: 1182: 1173: 1164: 1155: 1146: 1137: 1128: 1067: 1058: 1049: 1040: 1031: 1022: 1013: 1004: 975: 966: 957: 948: 939: 930: 3469:"Dangerous TikTok Challenge Sparks Warning From Firefighters" 2618: 2356: 866: 857: 848: 839: 830: 821: 812: 803: 777: 768: 759: 750: 741: 732: 723: 714: 688: 679: 670: 661: 652: 643: 634: 625: 561: 552: 543: 534: 525: 491: 477: 463: 454: 3487:"Authorities warn about dangerous TikTok 'outlet' challenge" 2638:. The TT-30R receptacle is commonly available in nearly all 2313: 2278: 2132:-inch (4.8 mm) diameter round or U-shaped ground pin, 1851:

small appliances that do not require grounding (earthing).

367: 84: 2044:

Japanese socket with grounding post, for a washing machine

1864:

inch (6.4 mm) wide, 0.06 inches (1.5 mm) thick,

4325:"Connector, Electrical, Power, General Specification for" 3592:

Pull the Plug on Cord-Related Hazards this Holiday Season

2312:

NEMA 6-50 with dustproof flexible shroud, used on a farm

67:

and other countries that use the standards set by the US

4020:. US Consumer Product Safety Commission. Archived from 3937:

Hubbell Twist-Lock Wiring Devices and Safety Enclosures

3085:

Leak-current detection and interruption (LCDI) cordsets

2190:, may result in the live–neutral polarity being lost. 4197:"Application Guide for Isolated Ground Wiring Devices" 4107:"Hospital Grade Devices: Tamper Resistant Receptacles" 4054:. National Fire Protection Association. Archived from 3081:

power tools, trimmers, sprinkler systems, and pumps.

1944:, are still produced with unpolarized narrow blades. 3614:

Tamper-Resistant Receptacles — A Successful Adoption

2975:

These versions of the 5-15R or 5-20R receptacle are

2963:

Ground fault circuit interrupter (GFCI) receptacles

3949:"Industrial grade 15A midget type locking devices" 3243: 2384:was incorporated in the National Electrical Code. 1983:A non-polarized 1-15P plug has 2 identical blades. 164:Both these patents were granted in November 1904. 36:Ungrounded (left) and grounded (right) power plugs 3114:configuration to blend with the decor of a room. 4379: 4250:. Newtown, CT: Taunton Press. pp. 170–171. 3810:"NEMA 6 50 vs 14 50 (Which Plug is Superior?) |" 3415:"Museum of Plugs and Sockets: DIN VDE 9400–9403" 3064: 3037: 3000: 2300:NEMA 6-15 (Green "U"-shaped contact is ground.) 246: 3289: 1843:This "2-prong" design, with two flat parallel 143: 3696:Technical Film and TV for Nontechnical People 3673:Technical Film and Tv for Nontechnical People 2924: 2634:standard (hot-neutral-ground), also known as 1995:One blade is wider on a polarized 1-15P plug. 262:National Electrical Manufacturers Association 69:National Electrical Manufacturers Association 3057:configurations, as well as surge-protective 2498:NEMA 14-30 clothes dryer receptacle and plug 325:are available to fit these holes, allowing " 4343:: CS1 maint: numeric names: authors list ( 4308:: CS1 maint: numeric names: authors list ( 3833:Receptacle Roundup IV: NEMA 10-30 and 14-30 2653: 2450:NEMA 14-50 devices are frequently found in 1829:National Electrical Contractors Association 4142:"2017-NEC-Significant-Code-Changes-Part-2" 4112:. Pass and Seymour Legrand. Archived from 4043: 4041: 2462:. Also, it was formerly common to connect 2183:Electrical Safety Foundation International 2162: in (11.9 mm) center-to-center. 1884:inch (15.9–18.3 mm) long, and spaced 1833:National Electrical Installation Standards 1422: 1413: 1404: 1395: 1386: 1377: 1368: 1359: 1350: 1341: 1315: 1306: 1297: 1288: 1279: 1270: 1261: 1252: 1243: 1234: 1208: 1199: 1190: 1181: 1172: 1163: 1154: 1145: 1136: 1127: 1066: 1057: 1048: 1039: 1030: 1021: 1012: 1003: 974: 965: 956: 947: 938: 929: 865: 856: 847: 838: 829: 820: 811: 802: 776: 767: 758: 749: 740: 731: 722: 713: 687: 678: 669: 660: 651: 642: 633: 624: 560: 551: 542: 533: 524: 490: 476: 462: 453: 4243: 4130:http://www.passandseymour.com/pdf/F10.pdf 4049:"Tamper-Resistant Electrical Receptacles" 3930: 3309: 2944: in (16 mm) drywall instead of 2443:, or 120 and 208 V if the supply is 2234:International Electrotechnical Commission 1827:specify a preferred orientation, but the 1810: 3985:. Hubbell Wiring Systems. Archived from 3692: 3136:A blue receptacle may indicate built-in 3101:(GFCI) protective device built into its 2966: 2928: 2893: 2617: 2355: 2112: 2104: 2092: 271: 39: 31: 4322: 4038: 4009: 4007: 3901: 3776: 3346: 2152: in (6.4 mm) edge-to-edge or 1913:, such as on double-insulated devices. 362:NEMA Receptacle chart (non-twist lock) 4380: 4282: 4134: 3551:, Japanese Standards Association, 1993 2630:) connector is a 120 V 30 A 4083:. Child Safety Outlet. Archived from 3885:"NEMA Straight Blade Reference Chart" 3268: 3266: 3264: 3262: 3260: 3211:, British three-pin plugs and sockets 123:History of AC power plugs and sockets 4004: 3719: 3686: 3171: 3095:leakage current detector interrupter 2574: 2109:Typical 5-15R residential receptacle 3847:. Tesla Motors, Inc. Archived from 3732:(3rd ed.). Focal. p. 20. 3725: 3541: 3448: 3215:CEE 7 standard AC plugs and sockets 3024: 1816:cannot be accidentally intermated. 71:. NEMA wiring devices are made in 13: 4285:"Attachment Plugs and Receptacles" 3863: 3257: 3162: 14: 4409: 4354: 3675:, Skyhorse Publishing Inc., 2002 3537:Electrical Safety | Novascotia.ca 2729: 4194: 3579:NEMA Locking Configuration Chart 3099:ground-fault circuit interrupter 2578: 2503: 2491: 2486:NEMA 14-30 and 14-50 receptacles 2479: 2305: 2293: 2049: 2037: 2025: 2012: 2000: 1988: 1976: 1900:ground fault circuit interrupter 226: 209: 192: 4373:Introduction to NEMA connectors 4316: 4276: 4264: 4237: 4213: 4188: 4163: 4099: 4073: 3972: 3941: 3912: 3877: 3837: 3826: 3802: 3760:"IEC 60906-2:2011 IEC Webstore" 3752: 3665: 3638: 3605: 3583: 3572: 3555: 3530: 3519:from the original on 2009-10-14 3505: 3479: 3461: 3442: 3191:General Services Administration 2510:A NEMA 14-50 supplying 12 1536: 350:, which once led to a building 267: 3431: 3407: 3383: 3358: 3303: 3145:emergency standby power source 2626:The NEMA TT-30 (TT stands for 1930: in or 7.9 mm wide, 1: 3237: 3108: 3065:Weather-resistant receptacles 2613: 2368:NEMA 10 connectors are a now 116: 4171:"Hospital Grade Power Cords" 4081:"Frequently Asked Questions" 3449:Lee, Bruce Y. (2020-02-23). 3232:Mains electricity by country 3038:Surge protective receptacles 3001:Tamper-resistant receptacles 2662:, although the term is used 1793: 1788: 1780: 1775: 1767: 1762: 1740: 1735: 1727: 1722: 1714: 1709: 1661: 1650: 1570: 247:Other American manufacturers 7: 4175:International Configuration 3197: 2915: 2906: 2889: 2880: 2871: 2863: 2855: 2847: 2839: 2827: 2818: 2809: 2800: 2791: 2454:, since they are used for " 1894:inch (12.7 mm) apart. 1623: 1618: 1610: 1599: 1594: 1559: 1554: 1532: 1523: 1451:120/208/240 V service 144:Harvey Hubbell's inventions 10: 4414: 3924:February 14, 2010, at the 3204:AC power plugs and sockets 3041: 2925:Additional safety features 2898:L21-30 plug and receptacle 2783: 2775: 2767: 2746: 2737: 2721: 2713: 2570: 2561: 2552: 2543: 2534: 2525: 2426: 2417: 2408: 2399: 2351: 2211:Parallel Blade with Ground 120: 28:AC power plugs and sockets 25: 18: 3919:Hubbell Corporate History 3908:Hubbell Corporate History 3699:. Allworth. p. 133. 3563:"Hubbell catalog, NEMA 2" 3178:Underwriters Laboratories 2342: 2333: 2324: 2242: 2088: 2079: 2070: 2061: 1838: 1485: 1482: 1479: 1476: 1473: 1470: 1467: 1464: 1459: 1456: 1453: 1450: 1447: 1433: 1430: 1326: 1323: 1219: 1216: 1103: 1100: 1097: 1094: 1091: 1080: 1077: 1074: 988: 985: 982: 925: 914: 911: 908: 893: 890: 879: 876: 873: 790: 787: 784: 701: 698: 695: 612: 609: 606: 603: 600: 577: 574: 571: 568: 507: 504: 501: 498: 397: 394: 391: 388: 385: 382: 379: 373: 366: 184:Some of Hubbel's patents: 4271:Electrical installations 3187:Defense Logistics Agency 3183:National Electrical Code 3149:Canadian Electrical Code 3091:National Electrical Code 2977:residual-current devices 2654:Twist-locking connectors 2458:" connections of larger 2236:'s IEC 60906-2 standard 2099:polarized or unpolarized 1825:Canadian Electrical Code 1821:National Electrical Code 1589:240 V (split-phase) 83:ratings from 125 to 600 4244:Cauldwell, Rex (2002). 3693:Campbell, Drew (2002). 3419:www.plugsocketmuseum.nl 3395:www.plugsocketmuseum.nl 1920:; the neutral blade is 1666: 1655: 1642:120/240 V (split- 1545: 1541: 1527: 1460:240/415 V service 1457:347/600 V service 1454:277/480 V service 255: 54:power plugs and sockets 4388:Mains power connectors 4323:W-C-596 (2014-05-25). 3726:Box, Harry C. (2003). 3312:Technology and Culture 2972: 2955: 2899: 2623: 2365: 2118: 2110: 2102: 1811:Non-locking connectors 1646:120/208 V (wye) 277: 75:ratings from 15 to 60 46: 37: 4283:UL 498 (2010-05-18). 3814:electriccarpledge.com 3297:U.S. patent 0,251,554 2970: 2932: 2897: 2697: 2678: 2621: 2460:recreational vehicles 2359: 2116: 2108: 2096: 312:recreational vehicles 275: 235:U.S. patent 1,180,648 218:U.S. patent 1,064,833 176:U.S. patent 1,180,648 170:U.S. patent 1,064,833 43: 35: 4393:Mechanical standards 2660:Hubbell Incorporated 2632:recreational vehicle 2227:lighting technicians 1756:hot–hot–hot–neutral 4369:at generatorjoe.net 4119:on 21 February 2007 3647:Child outlet safety 3156:corrosion-resistant 1448:Pole configuration 1444: 363: 338:Internet phenomenon 201:U.S. patent 774,250 161:U.S. patent 774,251 155:U.S. patent 774,250 4061:on 7 December 2008 4015:"GFCIs Fact Sheet" 3961:on 22 October 2020 3889:www.stayonline.com 3790:. Lincoln Electric 3654:on 22 January 2009 3627:on 2 December 2013 3119:de facto standards 3050:voltage transients 2973: 2956: 2900: 2624: 2366: 2119: 2111: 2103: 1704:240 V (delta) 1440: 361: 278: 47: 38: 4230:978-1-77139-718-6 3172:Related standards 3138:surge suppressors 3071:impact resistance 2608: 2607: 2441:split-phase power 2434:electric vehicles 2283:charging stations 1907:upward compatible 1808: 1807: 1438: 1437: 61:mains electricity 4405: 4349: 4348: 4342: 4334: 4332: 4331: 4320: 4314: 4313: 4307: 4299: 4297: 4296: 4287:. Archived from 4280: 4274: 4268: 4262: 4261: 4241: 4235: 4234: 4217: 4211: 4210: 4208: 4207: 4192: 4186: 4185: 4183: 4181: 4167: 4161: 4160: 4158: 4156: 4146: 4138: 4132: 4128: 4126: 4124: 4118: 4111: 4103: 4097: 4096: 4094: 4092: 4077: 4071: 4070: 4068: 4066: 4060: 4053: 4045: 4036: 4035: 4033: 4032: 4026: 4019: 4011: 4002: 4001: 3999: 3997: 3991: 3984: 3976: 3970: 3969: 3967: 3966: 3960: 3954:. Archived from 3953: 3945: 3939: 3934: 3928: 3916: 3910: 3905: 3899: 3898: 3896: 3895: 3881: 3875: 3874: 3873:. June 24, 2021. 3867: 3861: 3860: 3858: 3856: 3841: 3835: 3830: 3824: 3823: 3821: 3820: 3806: 3800: 3799: 3797: 3795: 3780: 3774: 3773: 3771: 3770: 3756: 3750: 3749: 3747: 3746: 3723: 3717: 3716: 3714: 3713: 3690: 3684: 3669: 3663: 3662: 3661: 3659: 3650:, archived from 3642: 3636: 3635: 3634: 3632: 3626: 3620:, archived from 3619: 3609: 3603: 3602: 3601: 3599: 3587: 3581: 3576: 3570: 3569: 3567: 3559: 3553: 3552: 3545: 3539: 3534: 3528: 3527: 3525: 3524: 3509: 3503: 3502: 3500: 3498: 3483: 3477: 3476: 3465: 3459: 3458: 3446: 3440: 3435: 3429: 3428: 3426: 3425: 3411: 3405: 3404: 3402: 3401: 3387: 3381: 3380: 3378: 3377: 3362: 3356: 3350: 3344: 3343: 3307: 3301: 3299: 3293: 3287: 3286: 3284: 3283: 3270: 3255: 3254: 3247: 3054:electrical noise 3025:AFCI receptacles 2953: 2952: 2948: 2943: 2942: 2938: 2603: 2600: 2582: 2575: 2507: 2495: 2483: 2469:charging station 2309: 2297: 2257: 2256: 2252: 2174: 2173: 2169: 2161: 2160: 2156: 2151: 2150: 2146: 2141: 2140: 2136: 2131: 2130: 2126: 2053: 2041: 2029: 2016: 2004: 1992: 1980: 1939: 1938: 1934: 1929: 1928: 1924: 1893: 1892: 1888: 1883: 1882: 1878: 1873: 1872: 1868: 1863: 1862: 1858: 1849:double-insulated 1706:208 V (wye) 1639:hot–hot–neutral 1591:208 V (wye) 1445: 1439: 1426: 1417: 1408: 1399: 1390: 1381: 1372: 1363: 1354: 1345: 1319: 1310: 1301: 1292: 1283: 1274: 1265: 1256: 1247: 1238: 1212: 1203: 1194: 1185: 1176: 1167: 1158: 1149: 1140: 1131: 1070: 1061: 1052: 1043: 1034: 1025: 1016: 1007: 978: 969: 960: 951: 942: 933: 869: 860: 851: 842: 833: 824: 815: 806: 780: 771: 762: 753: 744: 735: 726: 717: 691: 682: 673: 664: 655: 646: 637: 628: 564: 555: 546: 537: 528: 494: 480: 466: 457: 364: 360: 356:Westford Academy 343:Outlet challenge 237: 230: 220: 213: 203: 196: 178: 172: 163: 157: 97:CSA C22.2 No. 42 4413: 4412: 4408: 4407: 4406: 4404: 4403: 4402: 4378: 4377: 4363:at mahonkin.com 4357: 4352: 4336: 4335: 4329: 4327: 4321: 4317: 4301: 4300: 4294: 4292: 4281: 4277: 4269: 4265: 4258: 4242: 4238: 4231: 4219: 4218: 4214: 4205: 4203: 4193: 4189: 4179: 4177: 4169: 4168: 4164: 4154: 4152: 4144: 4140: 4139: 4135: 4122: 4120: 4116: 4109: 4105: 4104: 4100: 4090: 4088: 4087:on 25 July 2011 4079: 4078: 4074: 4064: 4062: 4058: 4051: 4047: 4046: 4039: 4030: 4028: 4024: 4017: 4013: 4012: 4005: 3995: 3993: 3992:on 12 July 2011 3989: 3982: 3978: 3977: 3973: 3964: 3962: 3958: 3951: 3947: 3946: 3942: 3935: 3931: 3926:Wayback Machine 3917: 3913: 3906: 3902: 3893: 3891: 3883: 3882: 3878: 3869: 3868: 3864: 3854: 3852: 3851:on 20 June 2013 3843: 3842: 3838: 3831: 3827: 3818: 3816: 3808: 3807: 3803: 3793: 3791: 3782: 3781: 3777: 3768: 3766: 3764:webstore.iec.ch 3758: 3757: 3753: 3744: 3742: 3740: 3724: 3720: 3711: 3709: 3707: 3691: 3687: 3670: 3666: 3657: 3655: 3644: 3643: 3639: 3630: 3628: 3624: 3617: 3611: 3610: 3606: 3597: 3595: 3589: 3588: 3584: 3577: 3573: 3565: 3561: 3560: 3556: 3547: 3546: 3542: 3535: 3531: 3522: 3520: 3511: 3510: 3506: 3496: 3494: 3485: 3484: 3480: 3467: 3466: 3462: 3447: 3443: 3436: 3432: 3423: 3421: 3413: 3412: 3408: 3399: 3397: 3389: 3388: 3384: 3375: 3373: 3364: 3363: 3359: 3351: 3347: 3324:10.2307/3105384 3308: 3304: 3295: 3294: 3290: 3281: 3279: 3272: 3271: 3258: 3249: 3248: 3244: 3240: 3200: 3174: 3165: 3163:Break-away tabs 3131:isolated ground 3111: 3087: 3067: 3046: 3044:Surge protector 3040: 3027: 3003: 2965: 2959:are available. 2950: 2946: 2945: 2940: 2936: 2935: 2927: 2918: 2909: 2892: 2883: 2874: 2866: 2858: 2850: 2842: 2830: 2821: 2812: 2803: 2794: 2786: 2778: 2770: 2749: 2740: 2732: 2724: 2716: 2700: 2681: 2656: 2616: 2604: 2598: 2595: 2588:needs expansion 2573: 2564: 2555: 2546: 2537: 2528: 2523: 2522: 2521: 2518: 2508: 2499: 2496: 2487: 2484: 2429: 2420: 2411: 2402: 2354: 2345: 2336: 2327: 2322: 2321: 2320: 2317: 2310: 2301: 2298: 2254: 2250: 2249: 2245: 2171: 2167: 2166: 2158: 2154: 2153: 2148: 2144: 2143: 2138: 2134: 2133: 2128: 2124: 2123: 2091: 2082: 2073: 2064: 2057: 2054: 2045: 2042: 2033: 2030: 2021: 2017: 2008: 2005: 1996: 1993: 1984: 1981: 1936: 1932: 1931: 1926: 1922: 1921: 1911:leakage current 1890: 1886: 1885: 1880: 1876: 1875: 1870: 1866: 1865: 1860: 1856: 1855: 1841: 1813: 1705: 1645: 1590: 1443: 1427: 1418: 1409: 1400: 1391: 1382: 1373: 1364: 1355: 1346: 1320: 1311: 1302: 1293: 1284: 1275: 1266: 1257: 1248: 1239: 1213: 1204: 1195: 1186: 1177: 1168: 1159: 1150: 1141: 1132: 1071: 1062: 1053: 1044: 1035: 1026: 1017: 1008: 979: 970: 961: 952: 943: 934: 870: 861: 852: 843: 834: 825: 816: 807: 781: 772: 763: 754: 745: 736: 727: 718: 692: 683: 674: 665: 656: 647: 638: 629: 565: 556: 547: 538: 529: 495: 481: 467: 458: 348:electric sparks 308:travel trailers 270: 258: 249: 244: 243: 242: 239: 233: 231: 222: 216: 214: 205: 199: 197: 186: 185: 174: 168: 159: 153: 146: 125: 119: 50:NEMA connectors 30: 24: 17: 12: 11: 5: 4411: 4401: 4400: 4398:NEMA standards 4395: 4390: 4376: 4375: 4370: 4364: 4356: 4355:External links 4353: 4351: 4350: 4315: 4275: 4263: 4256: 4247:Wiring a house 4236: 4229: 4212: 4187: 4162: 4149:cdn.ez-pdh.com 4133: 4098: 4072: 4037: 4003: 3971: 3940: 3929: 3911: 3900: 3876: 3862: 3836: 3825: 3801: 3775: 3751: 3738: 3718: 3705: 3685: 3671:Drew Campbell 3664: 3637: 3604: 3582: 3571: 3554: 3540: 3529: 3504: 3478: 3460: 3441: 3430: 3406: 3382: 3357: 3345: 3318:(3): 525–543. 3302: 3288: 3256: 3241: 3239: 3236: 3235: 3234: 3229: 3223: 3217: 3212: 3206: 3199: 3196: 3173: 3170: 3164: 3161: 3160: 3159: 3152: 3141: 3134: 3127: 3110: 3107: 3086: 3083: 3066: 3063: 3039: 3036: 3026: 3023: 3002: 2999: 2964: 2961: 2926: 2923: 2917: 2914: 2908: 2905: 2891: 2888: 2882: 2879: 2873: 2870: 2865: 2862: 2857: 2854: 2849: 2846: 2841: 2838: 2829: 2826: 2820: 2817: 2811: 2808: 2802: 2799: 2793: 2790: 2785: 2782: 2777: 2774: 2769: 2766: 2748: 2745: 2739: 2736: 2731: 2730:NEMA L3 and L4 2728: 2723: 2720: 2715: 2712: 2711: 2710: 2707: 2699: 2696: 2695: 2694: 2691: 2688: 2680: 2677: 2655: 2652: 2628:Travel Trailer 2615: 2612: 2606: 2605: 2585: 2583: 2572: 2569: 2563: 2560: 2554: 2551: 2545: 2542: 2536: 2533: 2527: 2524: 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2993: 2992:daisy-chained 2987: 2985: 2980: 2978: 2969: 2960: 2931: 2922: 2913: 2904: 2896: 2887: 2878: 2869: 2861: 2853: 2845: 2837: 2834: 2825: 2816: 2807: 2798: 2789: 2781: 2773: 2765: 2761: 2759: 2753: 2744: 2735: 2727: 2719: 2708: 2705: 2704: 2703: 2692: 2689: 2686: 2685: 2684: 2676: 2672: 2668: 2665: 2661: 2651: 2647: 2643: 2641: 2637: 2633: 2629: 2620: 2611: 2602: 2593: 2589: 2586:This section 2584: 2581: 2577: 2576: 2568: 2559: 2550: 2541: 2532: 2517: 2513: 2506: 2501: 2494: 2489: 2482: 2477: 2476: 2472: 2470: 2465: 2461: 2457: 2453: 2448: 2446: 2442: 2437: 2435: 2424: 2415: 2406: 2397: 2395: 2394:grandfathered 2389: 2385: 2383: 2382:safety ground 2379: 2375: 2371: 2363: 2358: 2349: 2340: 2331: 2315: 2308: 2303: 2296: 2291: 2290: 2286: 2284: 2280: 2276: 2270: 2268: 2264: 2259: 2240: 2239: 2235: 2230: 2228: 2224: 2220: 2216: 2212: 2208: 2204: 2199: 2195: 2191: 2189: 2184: 2179: 2176: 2163: 2115: 2107: 2100: 2095: 2086: 2077: 2068: 2052: 2047: 2040: 2035: 2028: 2023: 2015: 2010: 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