Industrial and multiphase power plugs and sockets

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Pin and sleeve connectors

Industrial and multiphase plugs and sockets provide a connection to the electrical mains rated at higher voltages and currents than household plugs and sockets. They are generally used in polyphase systems, with high currents, or when protection from environmental hazards is required. Industrial outlets may have weatherproof covers, waterproofing sleeves, or may be interlocked with a switch to prevent accidental disconnection of an energized plug. Some types of connectors are approved for hazardous areas such as coal mines or petrochemical plants, where flammable gas may be present.

Almost all three-phase power plugs have an earth (ground) connection, but may not have a neutral because three-phase loads such as motors do not need the neutral. Such plugs have only four prongs (earth, and the three phases). An example of a socket with neutral is the L21-30 (30 A) and the L21-20 (20 A) both of which have five pins (earth, neutral, and X, Y, Z phases).

While some forms of power plugs and sockets are set by international standards, countries may have their own different standards and regulations. For example, the colour-coding of wires may not be the same as for small mains plugs.

Concepts and terminology[edit]

Generally the plug is the movable connector attached to an electrically operated device's mains cable, and the socket is fixed on equipment or a building structure and connected to an energised electrical circuit. The plug has protruding pins or, in US terminology, blades (referred to as male) that fit into matching slots or holes (called female) in the sockets. A plug is defined in IEC 60050 as an accessory having pins designed to engage with the contacts of a socket-outlet, also incorporating means for the electrical connection and mechanical retention of flexible cables or cords, a plug does not contain components which modify the electrical output from the electrical input (except where a switch and/or fuse is provided as a means of disconnecting the output from input). In this article, the term 'plug' is used in the sense defined by IEC 60050. Sockets are designed to prevent exposure of bare energised contacts.

To reduce the risk of users accidentally touching energized conductors and thereby experiencing electric shock, plug and socket systems often incorporate safety features in addition to the recessed slots or holes of the energized socket. These may include plugs with insulated sleeves, recessed sockets, sockets with blocking shutters, and sockets designed to accept only compatible plugs inserted in the correct orientation.

The term plug is in general and technical use in all forms of English, common alternatives being power plug,[1] electric plug,[2] and (in the UK) plug top.[3] The normal technical term (in both British and International English) for an AC power socket is socket-outlet,[4] but in non-technical common use a number of other terms are used. In British English the general term is socket, but there are numerous common alternatives, including power point,[5] plug socket,[6] wall socket,[7] and wall plug.[8] In American English receptacle and outlet are common, sometimes with qualifiers such as wall outlet, electrical outlet and electrical receptacle, all of these sometimes to be found in the same document.[9]

Electrical sockets for industrial, commercial and domestic purposes generally provide two or more current carrying (live[10][11]) connections to the supply conductors. These connections are classified as poles. A pole will be either a neutral[12]connection or a line[13]

Neutral is usually very near to earth potential, usually being earthed either at the distribution board or at the substation. Line (also known as phase or hot, and commonly, but technically incorrectly, as live) carries the full supply voltage relative to the neutral (and to earth).

Single phase sockets are classified as two pole (2P) and provide a single line contact and a neutral contact. In addition, a protective earth[14] (Ground in American terminology) contact is usually, but not always, present, in which case the socket is classified as two pole and earth(2P+E).

Three phase sockets provide three line contacts, they may also include either or both of a neutral and protective earth contact. The designations of the three contacts may vary. The IEC standards use the Line designations L1, L2 and L3.[15] NEMA standards use the Phase designations X, Y and Z.[16]

Sockets intended for use with the American Split Phase distribution system may have two phase contacts and neutral In this case the phase designators X and Y are used.[17] They may also include a protective earth contact.


32 A 400 V 3P+N+E
16 A P+N+E 230 V plug
Mated 16 A plug and wall-mounted socket

Europe-wide IEC 60309 system[edit]

Main article: IEC 60309

In Europe, the most common range of heavy commercial and industrial plugs are made to IEC 60309 (formerly IEC 309) and various standards based on it (including BS 4343 and BS EN 60309-2). These are often referred to in the UK as CEE industrial, CEEform or simply CEE plugs, or as "Commando connectors" (after the MK Commando brand name for these connectors).

Plugs are available in P+N+E (unbalanced single phase with neutral), 2P+E (balanced single phase), 3P+E (3 phase without neutral), and 3P+N+E (three phase with neutral). Current ratings available are 16 A, 32 A, 63 A, 125 A and 200 A.

Voltage and other characteristics are represented by a colour code (in three-phase plugs the stated voltage is the phase-phase voltage, not the phase-neutral voltage). The different voltages have the earth pin of a larger diameter than the others, and located in different places depending on the voltage rating, making it impossible to mate, for instance, a blue plug with a yellow socket. Since the different current ratings have different overall sizes, it is also not possible to mate different pin configurations or current ratings. For example, a 16 A 3P+E 400 V plug will not mate with a 16 A 3P+N+E 400 V socket and a 16 A P+N+E 230 V plug will not mate with a 32 A P+N+E 230 V socket.

Characteristic[a][c] Colour Earth pin
50–250 V DC White 3h, 90°
>250 V DC White 8h, 240°
277 V 60 Hz only[d] White 5h, 150°
380 V 50 Hz only[e][f] White 3h, 90°
440 V 60 Hz only[e][f] White 3h, 90°
100–130 V[g] Yellow 4h, 120°
200–250 V[d] Blue 6h, 180°
120–250 V[e] Blue 9h, 270°
380–480 V[e] Red 6h, 180°
380–480 V[h] Red 11h, 330°
380–415 V[d] Red 9h, 270°
480–500 V[e] Black 7h, 210°
500–680 V[e] Black 5h, 150°
100–300 Hz[i][f] Green 10h, 300°
300–500 Hz[j][f] Green 2h, 60°
Any of the above[b] Grey 12h, 0°
None of the above[k] Grey 1h, 30°
  1. ^ All AC systems are either 50 or 60 Hz unless otherwise stated.
  2. ^ a b Single and 3 phase (3P+E only) supplied from an isolating transformer (except for yellow plug supplies).
  3. ^ All three phase plugs and socket are available in 3P+E or 3P+N+E (but see [b]).
  4. ^ a b c Single phase
  5. ^ a b c d e f Three phase line voltage (phase-phase).
  6. ^ a b c d Only available in 16 and 32 A sizes.
  7. ^ Single phase voltage or three phase line voltage (phase-phase) including supplies from an isolating transformer.
  8. ^ Three phase line voltage (phase-phase) at 60 Hz only.
  9. ^ Greater than 50 volts three phase line voltage (phase-phase). Not available in single phase version.
  10. ^ Greater than 50 volts single phase or three phase line voltage (phase-phase).
  11. ^ Most frequently used for low voltage supplies that do not fall into any of the specified ranges.

Yellow 2P+E, blue P+N+E, yellow 3P+E, red 3P+E, and red 3P+N+E are by far the most common arrangements. Blue P+N+E sockets (generally 16 A, although 32 A is becoming more common) are used as standard by British and Danish campsites and yacht marinas to provide 240 V domestic mains power to frame-tents, trailer-tents, caravans, and boats; they are also used elsewhere in Europe for the same purpose, though in some countries the local domestic plug is also widely used. Static caravans generally use the similar 32 A version because of the requirement to power electrical cooking and heating appliances. The blue P+N+E 16 A version carrying 240 V is also used in shopping malls and their peripherals to power 'temporary' stalls not incorporated within a lock-up shop, there is also use in domestic gardens within Britain to power garden equipment, barbecues, and temporary lighting. The yellow 2P+E 16 A version carrying 115 V is used extensively on the London Underground railway system to power temporary usage of heavy-duty fans; it is also frequently used by tradesmen within the UK, built into a portable transformer box that is powered from a standard 13 A 240 V mains supply, to run heavy-duty power-tools designed to operate at 115 V.

A small number of marinas provide 230 V single-phase power through a red three-phase connector (breaking the relevant standards in the process). This goes some way to ensuring that only boats that have paid the required fee (and thus obtained an appropriately made-up adaptor cable) are able to use the electricity.

Entertainment industry[edit]

Throughout Europe, a common use of industrial power connectors is in the entertainment and broadcast industries.

In this industry the above-mentioned IEC 60309 connectors are referred to as Ceeform connectors. 230 V single-phase (blue) and 400 V three-phase (red) connectors between 16 A and 125 A ratings are used.

Where more current carrying capacity is required, such as between generator sets and distribution boards, VEAM Powerlocks or Camlocks may be used. These connectors are single pole so five are required to accommodate all three phases, neutral and ground. Powerlocks have a rating of 400 A or 660 A at 1 kV. Camlocks E1016 Series are rated at 600 V 315 A.

Powerlocks are identified with the European harmonized colour code, they are also annotated as follows:

  •   Brown, L1
  •   Black, L2
  •   Grey, L3
  •   Blue, N
  •   Green, Earth

Camlocks are also available in these colours.

Where it is necessary to run separate feeds through multicable, the Socapex 19-pin connector is often encountered on theatre and studio lighting rigs.

UK: Lewden plugs[edit]

Lewden plugs and sockets are metal bodied waterproof plugs and sockets made by Lewden. The pin arrangements of the smaller single phase varieties are the same as BS 1363 and BS 546 plugs and sockets. These plugs and sockets will mate with normal plugs and sockets of the same pin arrangement but they are only waterproof when a Lewden plug is used in a Lewden socket and the screw ring is properly tightened (sockets have a metal cover that screws on to waterproof them when not in use).

UK: BS 196[edit]

In 1930, the BS 196 standard for industrial plugs and sockets was introduced. The plugs are available in 5 A, 15 A and 30 A variants, with various configurations of keyways and pins to cater for different voltages. BS 196 plugs have now been superseded by BS 4343 (CEE type) connectors in most modern applications.[18]

Sweden, Germany and Netherlands: Perilex plugs[edit]

Main article: Perilex

Perilex plugs and sockets are 5-pin 3-phase connectors. The system provides 400 V 3P+N+PE and exists in 16 A and 25 A versions. In Sweden, the 16 A is generally used for stoves and to some extent for other heating devices in kitchens.

Sweden: Semko 17 plugs[edit]

Semko 17 were 3/4-pin 3-phase connectors, with (4-pin) or without (3-pin) a neutral connector. Earth were provided via the shield. The connectors were available in different sizes, 16 A with rounded corners; 25 A and 63 A were rectangular. These connectors were used mainly in industrial and agricultural installations. Manufacturing and selling of Semko-17 connectors with metal shells was prohibited in 1989. A few years later manufacturing and selling of all Semko-17 connectors were prohibited.[19] Existing connectors may be used but not by any employee (prohibited by "Arbetsmiljöverket"). The reason for the prohibition is that Semko-17 had several safety issues. The ground connection can become oxidized and when the shells are made of metal any ground fault goes right through the hands of a person connecting/disconnecting a male and a female cable connector (unless the person wears insulating gloves). Incorrect use of the ground connector as a neutral was not uncommon. Perhaps the worst issue is that in some connectors the ground screw could rust so severely that the ground wire comes loose and in the worst case make contact with a live (phase) wire nearby.

Switzerland: SEV 1011[edit]

SEV 1011:2009, overview of the hierarchical Swiss System for household and similar purposes

The Swiss standard SN SEV 1011:2009 Plugs and socket-outlets for household and similar purposes.[20] defines a hierarchical system of plugs and sockets including both single and three phase connectors. Sockets will accept plugs with the same or fewer number of pins and the same or lower ratings.[21] Single phase Swiss plugs and sockets are described in AC power plugs and sockets

The type 15 plug and socket has 3 round pins of 4 mm diameter, plus 2 flat pins (for L2 and L3). It is designed for three phase applications and is rated at 10 A, 250 V/400 V. The socket will also accept types 11 and 12 plugs, and the Europlug.

The type 25 plug and socket has 3 rectangular pins, 4 mm x 5 mm, plus 2 flat pins (for L2 and L3). It is designed for three phase applications and is rated at 16 A, 250 V/400 V. The socket will accept types 11, 12, 21, and 23 single phase plugs, the Europlug, and types 15 and 23 three phase plugs.

Croatia, Serbia, BiH, Slovenia, Montenegro, Macedonia[edit]

380 V Yugoslavian 5-pin 3-phase wall socket
380 V Yugoslavian 5-pin 3-phase plug

This type of three phase plug and sockets are mainly used in households in ex. Yugoslavian countries, they are 5-pin 3-phase connectors, rated at 16 A, 380 V. Industrial 3-phase connectors are same as European IEC 60309.

North America[edit]

Pin and sleeve[edit]

Pin and sleeve plug

Pin and Sleeve circular connectors are not compatible with the newer IEC 60309 type. Current ratings are 30, 60, 100, 200, and 400 A. All are rated for voltages up to 250 V DC or 600 V AC. Contact arrangements are from 2 to 4 pins. There are two styles depending on the treatment of the ground. Style 1 grounds only on the shell. Style 2 uses one of the contacts as well as the shell, internally connected together. They are not strongly typed for specific circuits and voltages as the IEC 309 are. One insert rotation option is available to prevent mating of similar connectors with different voltages.

The contacts in the plug are simple cylinders (sleeves), while the pin contacts in the receptacle have the spring arrangement to hold contact pressure, the reverse of the IEC 60309 type connectors. All contacts are the same diameter. Originally metal construction was used, but now they are also made with plastic shells. Since only keying in the connector shell is used, and since the keys can be damaged in industrial use, it is possible to mis-match worn connectors.

NEMA connectors[edit]

Main article: NEMA connector

NEMA devices are not exclusively industrial devices, and some types are found in nearly all buildings in the United States. "Industrial-grade" connectors are constructed to meet or exceed the requirements of more stringent industry testing standards, and are more heavily built to withstand damage than residential and light commercial connectors of the same type.[22] Industrial devices may also be constructed to be dust or water-tight. NEMA wiring devices are made in current ratings from 15–60 A, and voltage ratings from 125–600 V.

There are two basic configurations of NEMA plug and socket: straight-blade and locking. Numbers prefixed by L are twist-lock, others are straight blade. Locking type connectors are found mostly in industrial applications and are not common in residential and light commercial use.

NEMA 10-20, 10-30 and 10-50[edit]

NEMA 10-30

NEMA 10 devices are a curious throwback to an earlier time. They are classified as 125/250 V non-grounding, yet they are usually used in a manner that effectively grounds the appliance, albeit not in a manner consistent with most modern practice. They provide a neutral pin and two phase pins (X & Y) which are used for the two phases of a split-phase source.

As commonly used, 10-30 and 10-50 plugs have the frame of the appliance grounded through the neutral pin. This was a legal grounding method under the National Electrical Code for electric ranges and electric clothes dryers from the 1947 to the 1996 edition. Since North American dryers and ranges have certain parts (timers, lights, fans, etc.) that run on 120 V, this means that the wire used for grounding is also carrying current. Although this is contrary to modern grounding practice, such installations remain extremely common in the United States and are relatively safe, because the larger conductors used are less likely to be broken than the smaller conductors used in ordinary appliance cords.

Persons moving their older appliances to newer NEMA 14-equipped buildings (or vice versa) should have the cords replaced by a qualified electrician, as the grounding details may be quite confusing to the uninitiated.

NEMA 10-20 devices are very rare nowadays. There is also a similar obsolete design, lacking a NEMA configuration number, rated 125 V 15 A or 250 V 10 A which is nearly identical to the AS/NZS 3112 standard used in Australia/New Zealand. These are also extremely rare.

NEMA 14[edit]

NEMA 14-30 and 14-50 receptacles

The NEMA 14 devices are 4-wire grounding devices available in ratings of 15–60 A. Of the straight-blade NEMA 14 devices, only the 14-30 and 14-50 are common. The voltage rating is a design maximum of 125/250 V. They are essentially the replacements for the connectors above with the addition of a separate grounding connection.

All NEMA 14 devices provide a ground pin, a neutral pin and two phase pins (X & Y) which are used for the two phases of a split-phase source. They differ in rating and shape of the neutral pin. The 14-30 has a rating of 30 A and an L-shaped neutral pin. The 14-50 has a rating of 50 A and a straight neutral pin sized so that it will not fit in the slot of a 14-30.

NEMA 14-30 devices are most commonly found serving electrically-heated clothes dryers, while 14-50 devices most commonly serve kitchen ranges. In the United States, these are generally found in buildings constructed after the 1996 National Electrical Code, although they are also found in considerably earlier mobile homes. In Canada, the use of NEMA 10 devices was discontinued much earlier (if it was ever permitted at all), so NEMA 14 devices are more common there.

Twist-locking connectors[edit]

30 A 208Y/120 V L21-30 receptacle
L21-30 plug

Twist-locking connectors were first invented by Harvey Hubbell III in 1938 and Twist-Lock remains a registered trademark of Hubbell Incorporated to this day,[23] although the term tends to be used generically to refer to NEMA twist-locking connectors manufactured by any company. Twist-locking connectors all use curved blades that have shapes that conform to portions of the circumference of a circle. Once pushed into the receptacle, the plug is twisted and its now-rotated prongs latch into the receptacle. To unlatch the plug, the rotation is reversed. The locking coupling makes for a very reliable connection in commercial and industrial settings.

Like non-locking connectors, these come in a variety of standardized configurations and follow the same general naming scheme except that they all begin with an L for locking. The connector families are designed so that 120 V connectors, 208/240 V connectors, and various other, higher-voltage connectors can not be accidentally intermated.[24]

Stage pin connectors[edit]

A stage pin connector. Note the GR denoting the longer ground pin, which is not quite in the center to prevent the plug being inserted upside down

A stage pin connector (SPC), or grounded stage pin (GSP), is a connector used primarily in the theatre industry for stage lighting applications in the United States. Stage pin connectors are generally used for conducting dimmed power from a dimmer to stage lighting instruments, although occasionally they can power other equipment.

The primary advantage of the stage pin connector over the NEMA 5-15 connector (commonly known as an Edison connector in the theatre industry) is its increased durability and resistance to damage due to its more robust construction and the ability to compensate for wear with a pin splitter. Having a distinct connector designated for dimmable power also helps prevent confusion of dimmed and non-dimmed circuits which could lead to equipment damage. Even the smallest stage pin connectors are rated for 20 A, which translates to 2.4 kW at 120 V, compared to the 15 A and 1.8 kW of the NEMA 5-15. In applications where cables are on the floor, the low profile of the connector allows for connections that are only slightly higher than the cables they connect.

California 50 A Connector[edit]

In North America for moderate current requirements the 50 A California style connector is commonly used. It features a twist-lock design with a metal sleeve full protecting the blades on the male connector and a center ground spike on the female connector to aid in centering.[25] California connectors are commonly used at outdoor events, shows and conventions and at construction sites.

For example, a three phase plug which requires a neutral connection cannot be inserted into a socket outlet which does not provide for such a connection. However, a plug which does not require a neutral connection can be inserted into a socket outlet which provides such a connection, although the neutral connection would not be utilised in that situation.

For stage lighting use, a common plug is the 32-A 5-pin connector with a neutral pin. Motor loads that don't need the neutral use a four-pin connector. Larger requirements may use powerlock or camlock connectors. In the IT industry, the IEC 60309 system is sometimes used.

In standard AS/NZS 3112, single phase plugs of lower current rating may be inserted into single phase socket outlets of higher current rating but not vice versa.

Compatibility is grouped like this, such that larger sockets in one group can take the same plug or any smaller plugs from that group only:[26]

  • Single phase flat pin plugs & sockets (250 V rating) - 10 A, 15 A, 20 A
  • Single phase size 1 (round pin) plugs & sockets (250 V rating) - 20 A
  • Single phase size 2 (round pin) plugs & sockets (250 V rating) - 32 A
  • Multiphase size 1 unique (500 V rating) - 16 A (no neutral pin)
  • Multiphase size 1 (500 V rating) - 10 A, 20 A (all available with or without neutral)
  • Multiphase size 2 (500 V rating) - 32 A, 40 A, 50 A (all available with or without neutral)

There are also metal clad plugs and sockets that go up to 63 A ratings, at a significantly higher cost.[27]

Within each size group, certain "lugs" on the outside of the plugs of higher current rating prevent a plug rated for a higher current being installed into a socket outlet rated for a lower current. However, a plug rated for a lower current can be installed into a socket outlet of the same size group rated for a higher current. For example, a 32-A 4-pin plug without neutral can plug into a 50-A 5-pin socket with neutral available. However a 10-A 5-pin plug cannot fit a 32-A 5-pin socket, as the plugs are different diameters.

See also[edit]


  1. ^ Scott, C.; Wolfe, P.; Hayes, B. (2004). Snort For Dummies. Wiley. p. 227. ISBN 9780764576898. Retrieved 7 February 2016. 
  2. ^ Fullick, P. (2001). Physics for AQA.: Coordinated award. Pearson Education. ISBN 9780435584207. Retrieved 7 February 2016. 
  3. ^ Linsley, T. (2008). Advanced Electrical Installation Work. Taylor & Francis. ISBN 9781136444487. Retrieved 7 February 2016. 
  4. ^ "IEC/TR 60083 Ed. 6.0, IEC, 2009". Retrieved 7 February 2016. 
  5. ^ Collins (2006), "Power Point", Essential English Dictionary (2nd ed.), The Free Dictionary 
  6. ^ Douglas, J. (2010). Building Surveys and Reports. Wiley. p. 254. ISBN 9781444391084. Retrieved 7 February 2016. 
  7. ^ Odom, W. (2004). Computer Networking First-step. Cisco Press. p. 38. ISBN 9781587201011. Retrieved 7 February 2016. 
  8. ^ Stein, B. (1997). Building Technology: Mechanical and Electrical Systems. Wiley. p. 723. ISBN 9780471593195. Retrieved 7 February 2016. 
  9. ^ [1], Tamper Resistant Receptacles, Electrical Safety Foundation International, 2009, (retrieved 1 March 2013 from ESFI)
  10. ^ Williams, N.; Sargent, J.S. (2012). Electrical Inspection Manual, 2011 Edition. Jones & Bartlett Learning, LLC. p. 29. ISBN 9781449695538. Retrieved 30 July 2016. 
  11. ^ Scaddan, B. (2011). 17th Edition IEE Wiring Regulations: Explained and Illustrated. Newnes. p. 44. ISBN 9780080969176. Retrieved 30 July 2016. 
  12. ^ "IEC 60050 - International Electrotechnical Vocabulary - Details for IEV number 195-02-06: "neutral conductor"". Retrieved 30 July 2016. 
  13. ^ "IEC 60050 - International Electrotechnical Vocabulary - Details for IEV number 195-02-08: "line conductor"". Retrieved 30 July 2016. 
  14. ^ Tzimenakis, J.; Holland, D. (2000). Electrical Product Safety: A Step-by-step Guide to LVD Self-assessment. Newnes. p. 58. ISBN 9780750646048. Retrieved 7 February 2016. 
  15. ^ IEC 60309-2:1999+AMD1:2005+AMD2:2012 CSV, Plugs, socket-outlets and couplers for industrial purposes - Part 2: Dimensional interchangeability requirements for pin and contact-tube accessories, Cl 7.5, CH: International Electrotechnical Commission, 2012 
  16. ^ ANSI/NEMA WD 6-2016 Wiring Devices Dimensional Specifications
  17. ^ ANSI/NEMA WD 6-2016 Wiring Devices Dimensional Specifications
  18. ^,%20Heavy%20Duty,%20CEEGO%20and%20Fuse%20Ranges.pdf
  19. ^ "Så elsäkrar du ditt lantbruk (in swedish)". Swedish authority for electrical safety. Retrieved 2013-08-24. 
  20. ^ "SEV 1011:2009, Plugs and socket-outlets for household and similar purposes" (PDF). Electrosuisse, SEV Verband für Elektro-, Energie- und Informationstechnik. 2009. Retrieved 2014-08-27. 
  21. ^ "Information SEV 1011 – power socket/plug/connector" (PDF). Federal Inspectorate for Heavy Current Installations ESTI, Swiss Confederation. 1 August 2011. Retrieved 2014-08-22. 
  22. ^ Domitrovich, Thomas A. (16 September 2013). "A Journey Back to Basics With Receptacles". International Association of Electrical Inspectors. Retrieved 24 July 2016. 
  23. ^ Hubbell Corporate History
  24. ^ Hubbell Twist-Lock Wiring Devices and Safety Enclosures
  25. ^ HUBBELL CS6365C AC Plug CA STD 50a 125/250v Male
  26. ^
  27. ^

External links[edit]