Pigtail
A short jumper wire used to connect a device to a circuit without breaking the run.
Definitions
A short length of wire spliced into a wire-nutted bundle, with its free end landing on a device terminal. Lets you join two or more circuit conductors together and feed a single device off them — instead of looping the circuit through the device itself (where a bad receptacle would break everything downstream). Code-required on multi-wire branch circuits.
Verb: to make that connection. 'I pigtailed the grounds together.'
A short factory-attached lead coming out of a sealed device — a light fixture, a motor, a sensor — that you splice your supply into.
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