Oscillating Current. (See [Current, Oscillating].)
Outlet. That part of an electrolier or electric light fixture out of which the wires are led for attachment to incandescent light sockets.
Outside Wiring. The wiring for an electric circuit which is located outside a building or other structure.
Overhead Feeders. The same as overhead conductors.
Overhead Trolley. The system in which the current for the propulsion of trolley-cars is taken from overhead feeders or wires.
Overhead Trolley-wire. A naked, hard copper wire drawn at high tension, and suspended over or at the side of a car-track, and from which the trolley-wheel takes its current.
Overload. In an electric motor, an excess of mechanical load prevents economical working, causing the armature to revolve slowly and the wiring to heat. In this case heating implies waste of energy.
Overload Switch. A switch which operates automatically to open a circuit in line with a motor, and so save the motor from overheating or burning in the event of an overload.
P
Paper Cable. A cable insulated with waxed or paraffined paper.