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There are two basic configurations of NEMA plug and socket: straight-blade and locking. Numbers prefixed by L are twist-lock, others are straight blade. Locking type connectors are found mostly in industrial applications and are not common in residential and light commercial use.
Twist-locking types are used for heavy industrial and commercial equipment, where increased protection against accidental disconnection is required. The numerals preceding the hyphen encode the number of poles (current-carrying terminals) and wires connected to it, the voltage, and single- or three-phase power.
It has a twist-to-lock design, where two lugs on the female connector engage slots in the shell of the male one. BNC is designed to maintain the characteristic impedance of the cable across the connection, and is made in 50-ohm and 75-ohm versions. It is normally used for radio-frequency signals up to about 2 gigahertz and 500 volts.
Other manufacturers make compatible products, [3] often under the name "speaker twist connector". Speakon connectors are rated for at least 30 A RMS continuous current, [ 4 ] higher than 1/4-inch TS phone connectors , two-pole twist lock, and XLR connectors for loudspeakers.
Clock diagram for the regular (>50 V) connector series, viewed looking in to the socket end. The extra-low voltage connector also supports keying, although in this case the angle is the position of the minor key, assuming the major key is at the 6h position (180°).
Some connector housings are designed with locking mechanisms to prevent inadvertent disconnection or poor environmental sealing. [1] Locking mechanism designs include locking levers of various sorts, jackscrews, screw-in shells, push-pull connector, and toggle or bayonet systems. Some connectors, particularly those with large numbers of ...