![]() The common NAMA 1 codes include 1-15P, 1-20P, 1-30P, etc. In addition, they are upward compatible with modern grounded NEMA 5 receptacles. For example, they are commonly seen on basic lamps or non-grounded hair dryers. Although the NEMA 1 plugs in 2-prong power cords are ungrounded, they are still popularly used by manufacturers of small appliances and electronic devices because of the low cost and compact size. NEMA 1: NEMA 1 connectors support 2-wire non-grounding devices rated for 125 V. The following part will introduce the most commonly used NEMA connectors (all are straight-blade ones) with different designations. What’s more, different NEMA connectors have different specification codes as their identifications such as 1-15P, 1-20P, 5-15P, 5-20P, etc. The locking NEMA connectors include 24 subtypes such as ML, NEMA L1, NEMA L2, NEMA L23, etc. The straight-blade or non-locking NEMA connectors include 25 subtypes such as NEMA 1, NEMA 2, NEMA 3, NEMA 24, NEMA TT-30, etc. NEMA connectors can be divided into different subtypes according to different classifications as well. The locking connectors are reserved for more industrial uses and will have curved blades that allow the plug to be twisted and locked into the receptacle. One can detach the NEMA power plugs from the outlets or receptacles by pulling back on the plug body. NEMA straight-blade or non-locking connectors use blades of various flat and folded shapes except for the round pins used on grounding connectors. Straight blades are mostly found in regular consumer electronics and the metal conductive blades are often informally called "prongs" (3-prong power cord, for example). There are two main classifications of NEMA connectors, namely straight-blade and locking. Different NEMA connectors form different NEMA power cord types.
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