A switch that turns lights or other electrical devices on or off depending upon the light. An example of a photoelectric switch is a switch that turns on outdoor lights at dusk. …
Pier
A rectangular masonry support column. …
Pigtail
A short wire connected to another wire, usually with a wire nut. Normally two or more pigtails are connected to a single wire for the purpose of making connections to multiple objects (two sockets, …
Pigtail Cord
A short electrical cord with an integral plug, designed to be attached to an appliance. …
Pilasters
Decorative vertical columns attached to the wall or frame at each side of a doorway. …
Pilot
The flame or electronic control that ignites gas or oil burners. …