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National Electrical Manufacturers Association (NEMA) as approved by American National Standards Institute (ANSI) published ANSI/NEMA WD 6 to specify Wiring Device dimensional specifications. The male and female cord ends identified in this document are categorized as Non-Locking Type and Locking Type.
The Non-Locking Type which have flat blades are commonly referred to a Straight Blade. We have provided the full list of NEMA configurations that have been specified. This does NOT mean the units are commercially available as many have never been put into production by the various electrical wiring device manufacturers. You will note in the cross reference that N/A (not available) appears often to largely reflect the absence of a commercially produced product.
National Electric Code (NEC) also influences the options in which a wiring device is offered. For instance female cord connectors, panel outlets, and panel inlets are not typically NOT found over 20 Amps due to limiting guidance in the published NEC.