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NEMA connectors are power plugs and receptacles used for Air conditioning mains electrical power in Northern America along with other countries designed to use the standards set from the US National Electric Producers Connection. NEMA wires devices come in current ratings from 15 to 60 amperes (A), with voltage ratings from 125 to 600 volts (V). Various mixtures of contact blade widths, shapes, orientations, and measurements produce non-interchangeable connectors that are distinctive for each blend of voltage, electric current carrying capability, and grounding system.

L6 20 Plug

NEMA 1-15P (two-pole, no ground) and NEMA 5-15P (two-pole with ground pin) plugs are employed on common domestic electric gear, and NEMA 5-15R will be the regular 15-ampere electric receptacle (outlet) found in the United States, and under appropriate nationwide specifications, in Canada (CSA C22.2 No. 42, Mexico (NMX-J-163-ANCE) and China (JIS C 8303).

Other plug and receptacle types are for special purposes or weighty-duty applications.

NEMA connectors are known as subsequent an alphanumeric program code comprising: prefix “L” (locking types), numerals, a hyphen, numerals, suffix “R” or “P” for “receptacle” or “plug”.

The two main basic classifications of NEMA connectors: straight-blade and securing. The steel conductive cutting blades are often informally called “prongs” (as with “3-prong plug”). Numbers prefixed by ‘L’ are curved-blade, perspective-securing connectors. Twist-locking types can be used as heavy commercial and industrial equipment, in which improved protection towards accidental disconnection is required.

The numerals preceding the hyphen encode the number of poles (current-transporting terminals) and wires connected to it, the voltage, and solitary- or three-phase power. A connector with ground terminal is described as having much more wires than poles, e.g. two-pole, three-wire; or 4-pole, five-cable; etc. A low-grounding gadget may be two-pole, two-wire; three-pole, three-cable; and so on.

The numerals following the hyphen will be the current rating in the device in amperes. This number is followed by the letter ‘R’ to indicate a receptacle or ‘P’ to suggest a plug.

For instance, the 5-15R will be the typical 125 V two-pole, 3-cable receptacle rated for 15 A. The L5-15R, whilst revealing exactly the same electrical rating, is a locking design that is certainly not actually compatible with the directly-blade 5-15 style. The 5-30R provides the exact same two-pole, 3-wire configuration and 125 V ranking, but is ranked for 30 A.

Even though there are numerous non-grounding gadget types within the NEMA standards, only three turn out to be in widespread use today. These are the basic two-pole 1-15, still used in countless buildings built before the 1960s, and also the three-pole 10-30 and 10-50.

Other sorts of NEMA connections which do not stick to this nomenclature include: the ML collection (so-called “Midget Securing” connections known as for small size), TT (to connect journey trailers and other recreational vehicles to exterior energy sources), SS collection (“ship-to-shoreline” connectors to connect boats to shoreline power) and the FSL collection (found in military and aircraft applications).

The small opening nearby the end from the power (low-ground) blades of some NEMA plugs can be used for comfort in manufacturing; if present, it ought to be of specified size and position. Little specific padlocks are offered to fit these openings, allowing “lockout” of hazardous equipment, by actually preventing insertion of locked plugs right into a power receptacle. Because at the very least 1949, numerous receptacle gadgets have been created to use these openings to hold the prongs inside the receptacle slots, skocrg a corresponding latch or locking mechanism.

The blades of any NEMA connector are recognized inside the dimensional standard the following: ‘G’ recognizes the grounding conductor, ‘W’ identifies the (grounded) natural conductor, and ‘X’, ‘Y’, and ‘Z’ would be the “hot” line conductors. Solitary-phase connectors have only a single terminal recognized as ‘X’ or two terminals, ‘X’ and ‘Y’. 3-phase connectors will make use of ‘X’, ‘Y’ and ‘Z’.

Criticism has become targeted at the design departing a gap with exposed prongs. This safety defect has become exploited with a January 2020 Web phenomenon known as the Outlet challenge, in which conductive materials, generally coins or papers clips had been dropped in to the space, leading to electric sparks, which once led to a developing evacuation in Westford Academy