A lamp inside an enclosure provided for use during maintenance is an example of such a circuit. The control panel may be isolated but the lamp will require power so that the engineer can see while working on it.
A receptacle outlet is one in which one or more receptacles are installed for the purpose of attaching “plug and cord-connected” type devices, and a lighting outlet is one intended for a direct-wired connection to a lamp holder, luminaire (lighting fixture) or ceiling fan.
D-42 - Engine Wiring Diagram Specialist
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