NEMA Receptacle Types
There are many different types of NEMA power receptacles and plugs. If you already have power receptacles installed at your site and you are wanting to determine what type of NEMA plug you have, included below you will find the most common types of NEMA receptacles for the PDUs we sell at Advanced Clustering Technologies.
NEMA L5: these connectors are a series of locking connectors with a maximum specified voltage of 125 V. Supply connections are intended for single-pole hot-neutral-ground circuits with a nominal voltage of 120 V RMS.
NEMA L6: these connectors are used with circuits with a maximum specified voltage of 250 V. Supply connections are intended for two-pole, three wire hot-hot-ground circuits with a nominal supply voltage of 240 V or 208 V, depending on phase configuration. The L6 connector does not provide a neutral line.
L6-20 and L6-30 connectors are commonly found on in-rack power distribution units in countries where the mains supply voltage is greater than 120 V. They are also found in the US for heavy-duty 240V equipment such as welders, where the higher supply voltage allows a lower current draw. These connectors are thus found where industrial equipment or large power tools are commonplace.
NEMA L21: these connectors are used with circuits with a maximum specified voltage of 120/208 V AC. Supply connections are intended for three-phase, five-wire L-L-L-N-G circuits with a nominal supply voltage of 208 V L-L and 120 V L-N. These three-phase connections include neutral and ground. The pin in the middle is ground, and the blade with a right angle on the tab is neutral.