Bryant Electric pin and sleeve line safeguards against mismating devices of different amperage and voltage ratings. Conformance with IEC 60309-1 and IEC 60309-2 international standards results in a singly rated, non-interchangeable configuration for each amperage/voltage type. The voltage rating can be identified by the clock position of the female grounding sleeve relative to the housing keyway. With the keyway always positioned at 6 oclock, the female grounding sleeve is located at a specific clock position for each voltage rating.