NEMA connectors are power plugs and receptacles employed for AC mains electricity in Northern America as well as other countries designed to use the standards set through the US Nationwide Electrical Producers Connection. NEMA wiring 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, designs, orientations, and measurements create non-interchangeable connectors which are distinctive for every mixture of voltage, electric current carrying capacity, and grounding system.
NEMA 1-15P (two-pole, no ground) and NEMA 5-15P (two-pole with ground pin) plugs are used on common household electrical equipment, and NEMA 5-15R will be the regular 15-ampere electric receptacle (electric outlet) found in america, and below relevant national specifications, in Canada (CSA C22.2 No. 42, Mexico (NMX-J-163-ANCE) and Japan (JIS C 8303).
Other plug and receptacle types are for unique purposes or perhaps for heavy-responsibility applications.
NEMA connections are named following an alphanumeric program code comprising: prefix “L” (securing types), numerals, a hyphen, numerals, suffix “R” or “P” for “receptacle” or “plug”.
There are 2 basic classifications of NEMA connections: directly-blade and securing. The steel conductive cutting blades tend to be informally called “prongs” (as with “3-prong plug”). Numbers prefixed by ‘L’ are curved-blade, perspective-locking connectors. Twist-securing types are used for heavy commercial and commercial gear, where increased protection towards unintentional disconnection is needed.
The numerals previous the hyphen encode the number of poles (current-carrying terminals) and cables connected to it, the voltage, and solitary- or three-stage energy. A connector with ground terminal is identified as having more wires than poles, e.g. two-pole, 3-cable; or four-pole, 5-cable; etc. A low-grounding device may be two-pole, two-wire; three-pole, three-wire; and so on.
The numerals pursuing the hyphen will be the current rating of the gadget in amperes. This number is then the letter ‘R’ to suggest a receptacle or ‘P’ to indicate a plug.
For example, the five-15R will be the common 125 V two-pole, 3-wire receptacle rated for 15 A. The L5-15R, whilst revealing exactly the same electric rating, is a securing style that is not actually suitable for the straight-blade 5-15 design. The 5-30R has got the same two-pole, three-cable configuration and 125 V rating, but is rated for 30 A.
Even though there are several non-grounding gadget types inside the NEMA specifications, only three seem to be in prevalent use nowadays. These are the basic two-pole 1-15, still in use in millions of buildings constructed before the 1960s, and also the three-pole 10-30 and 10-50.
Other sorts of NEMA connectors which do not stick to this nomenclature consist of: the ML series (so-called “Midget Locking” connectors named for his or her diminutive size), TT (to connect travel trailers and other leisure vehicles to exterior power resources), SS series (“deliver-to-shore” connections to connect boats to shore energy) as well as the FSL collection (used in military services and aircraft applications).
The little opening close to the finish from the energy (non-ground) cutting blades of some NEMA plugs is used for convenience in production; if present, it must be of specified size and position. Little specialized padlocks are for sale to match these openings, enabling “lockout” of hazardous gear, by physically stopping placement of secured plugs right into a energy receptacle. Because at least 1949, numerous receptacle devices have been created to utilize these holes to hold the prongs in the receptacle slot machines, skocrg a corresponding latch or securing mechanism.
The blades of any NEMA connector are recognized inside the dimensional regular the following: ‘G’ identifies the grounding conductor, ‘W’ recognizes the (grounded) natural conductor, and ‘X’, ‘Y’, and ‘Z’ are the “hot” line conductors. Solitary-stage connectors just have a single terminal known as ‘X’ or two terminals, ‘X’ and ‘Y’. Three-phase connectors will use ‘X’, ‘Y’ and ‘Z’.
Judgments continues to be aimed at the style leaving a gap with exposed prongs. This safety flaw continues to be exploited by a January 2020 Web trend called the Outlet obstacle, in which conductive components, usually coins or papers clips had been dropped into the gap, leading to electric sets off, which as soon as triggered a building evacuation in Westford Academy