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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 (CSA C22.2 No. 42 [1]), Mexico (NMX-J-163-ANCE) and Japan (JIS C 8303).
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 exist. Both current-carrying blades on grounding plugs are normally narrow, since the ground pin enforces polarity.
The ground tab is designed to be attached to the outlet faceplate screw, which is supposed to be connected to the building electrical ground. A cheater plug , AC ground lifter or three-prong/two-prong adapter is an adapter that allows a NEMA 5-15P grounding -type plug (three prongs) to connect to a NEMA 1-15R non-grounding receptacle (two slots).
Obsolete 125 V, 15 A / 250 V, 10 A duplex outlet. A patent for the obsolete "wye" American plug and socket was filed in 1915 under U.S. patent 1,179,728. [21] It predated the NEMA sockets and plugs. The plugs and sockets used in countries such as Argentina, Australia and China are based on this type and are physically compatible.
The 15 A outlet has a wider earth pin than the 10 A outlet. The 20 A outlet has a wider earth pin and wider Line and Neutral pins. The 25 A outlet has an inverted L-shaped earth pin and wider Line and Neutral pins. The 32 A outlet has a sideways U-shaped earth pin and wider Line and Neutral pins.
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.
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