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  2. Three-prong adaptor - Wikipedia

    en.wikipedia.org/wiki/Three-prong_adaptor

    When used as intended, the ground pin of the 3-wire receptacle is to be connected to a grounded cover screw, or to an external ground. In 1969, Underwriters Laboratories mandated three-prong plugs on major appliances for safety. [7] At that time, only half of the receptacles in US homes were three-prong. [7]

  3. NEMA connector - Wikipedia

    en.wikipedia.org/wiki/NEMA_connector

    Ungrounded (left) and grounded (right) power plugs 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 buildings.

  4. GOST 7396 - Wikipedia

    en.wikipedia.org/wiki/GOST_7396

    The plug will fit into the 16 A variety of the C 1 socket, but will not be grounded. C 4: CEE 7/7 16 A This is the compromise plug designed to be accepted and to be grounded in both the Schuko and French sockets. The plug will fit into the 16 A variety of the C 1 socket, but will not be grounded. C 5: CEE 7/16 Europlug 2.5 A (Type C)

  5. AC power plugs and sockets - Wikipedia

    en.wikipedia.org/wiki/AC_power_plugs_and_sockets

    Grounded vs ungrounded NEMA plugs. The NEMA 5-15 plug has two flat parallel blades like NEMA 1-15, and a ground (earth) pin. [47] It is rated 15 A at 125 volts. The ground pin is longer than the line and neutral blades, such that an inserted plug connects to ground before power. The ground hole is officially D-shaped, although some round holes ...

  6. Appliance classes - Wikipedia

    en.wikipedia.org/wiki/Appliance_classes

    In many countries the plug of a class 0 equipment is such that it cannot be inserted to grounded outlet like Schuko. The failure of such an equipment in a location where there are grounded equipment can cause fatal shock if one touches both. Any Class 1 equipment will act like a Class 0 equipment when connected to an ungrounded outlet.

  7. Bootleg ground - Wikipedia

    en.wikipedia.org/wiki/Bootleg_ground

    In the less-dangerous instance of a bootleg ground, a short wire jumper is connected between the bonding screw terminal (usually colored green) on a NEMA 5-15R or 5-20R outlet to the neutral (a.k.a. grounded conductor, colored white according to code) or directly to the white neutral wire via a pigtail.

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  9. Residual-current device - Wikipedia

    en.wikipedia.org/wiki/Residual-current_device

    A residual-current device (RCD), residual-current circuit breaker (RCCB) or ground fault circuit interrupter (GFCI) [a] is an electrical safety device that interrupts an electrical circuit when the current passing through a conductor is not equal and opposite in both directions, therefore indicating leakage current to ground or current flowing to another powered conductor.

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