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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.
This socket is recommended in IEC standard 60906-2 for 120-volt 60 Hz installations. The National Electrical Contractors Association's National Electrical Installation Standards (NECA 130-2010) recommends that sockets be mounted with the ground hole up, such that an object falling on a partially inserted connector contacts the ground pin first ...
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. [23]
Lighting and general purpose receptacles are at 120 volts AC, with larger devices fed by three wire single-phase circuits at 240 volts. In commercial construction, three-phase circuits are often used. Common 3 phase configurations within a building are 208v/120 wye, 120/240 center tapped delta and 480v/277v wye. Lighting is usually fed by 277 V ...
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 ...
The J1772-2009 connector is designed for single phase alternating current electrical systems with 120 V or 240 V such as those used in North America and Japan. The round 43-millimetre (1.7 in) diameter connector is keyed and has five pins (viewed from outside of the plug): [19]
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