WAC 296-307-36842. Wiring for receptacles, cord connectors, and attachment plugs (caps)

(1) Receptacles, cord connectors, and attachment plugs must be constructed so that no receptacle or cord connector will accept an attachment plug with a different voltage or current rating than that for which the device is intended. However, a 20-ampere T-slot receptacle or cord connector may accept a 15-ampere attachment plug of the same voltage rating. (2) A receptacle installed in a wet or damp location must be suitable for the location.