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  2. Ground and neutral - Wikipedia

    en.wikipedia.org/wiki/Ground_and_neutral

    The neutral conductor of a 3-phase, 4-wire system and the middle conductor of a 2- phase, 3-wire system must have at least 2 separate and distinct earth connections with a minimum of 2 different earth electrodes to have a satisfactory earth resistance

  3. NEMA connector - Wikipedia

    en.wikipedia.org/wiki/NEMA_connector

    The neutral connection is the wider T-shaped slot on the right. 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.

  4. Electrical wiring in North America - Wikipedia

    en.wikipedia.org/wiki/Electrical_wiring_in_North...

    The neutral wire is identified by gray or white insulated wire, perhaps using stripes or markings. With lamp cord wire the ribbed wire is the neutral, and the smooth wire is the hot. NEC 2008 400.22(f) allows surface marking with ridged, grooves or white stripes on the surface of lamp cord.

  5. IEC 60309 - Wikipedia

    en.wikipedia.org/wiki/IEC_60309

    Three-phase electric motors do not need the neutral wire to function, so that there is also a red four pin variant (3 phases and earth) of the IEC 60309 plugs for three phase power. The two styles are not intermatable, to prevent a potential floating neutral.

  6. AC power plugs and sockets - Wikipedia

    en.wikipedia.org/wiki/AC_power_plugs_and_sockets

    Where a "neutral" conductor exists in supply wiring, polarisation of the plug can improve safety by preserving the distinction in the equipment. For example, appliances may ensure that switches interrupt the line side of the circuit, or can connect the shell of a screw-base lampholder to neutral to reduce electric shock hazard.

  7. Three-prong adaptor - Wikipedia

    en.wikipedia.org/wiki/Three-prong_adaptor

    Modern cheater plugs lack a flexible wire which could be accidentally misconnected. The flat parallel plug blades are polarized to prevent the hot and the neutral connections from being reversed. In addition, many versions have a molded obstruction bump on top of the adapter, to block the grounding prong and thus physically prevent forcible ...

  8. IEC 60320 - Wikipedia

    en.wikipedia.org/wiki/IEC_60320

    A variety of different kinds of IEC 60320 plugs and sockets. IEC 60320 Appliance couplers for household and similar general purposes [1] is a set of standards from the International Electrotechnical Commission (IEC) specifying non-locking connectors for connecting power supply cords to electrical appliances of voltage not exceeding 250 V (a.c.) and rated current not exceeding 16 A. [1 ...

  9. AS/NZS 3112 - Wikipedia

    en.wikipedia.org/wiki/AS/NZS_3112

    A major update was released in 2000 as AS/NZS 3112:2000, which mandated active and neutral insulated pins [24] on the plugs sold for use with these socket-outlets after 3 April 2005, which somewhat negates any 'advantage' of having the earth pin uppermost. The standard AS/NZS 3112:2004 introduced more stringent testing procedures to test for ...

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