Is Capping a Live Wire Safe

Capping off electrical wires is necessary to safely remove a device from a circuit. A wire capable of being made hot by turning on a circuit breaker or replacing a fuse needs to be capped off if not connected to a load or some electrical device. An energized wire is a shock hazard to a person making contact with it.

Are capped wires safe?

Yes. This is not only safe but best practice. Tuck the capped wires completely into the junction boxes to avoid accidentally snagging on passing ladders, wallboard, etc. If the room continues in general use then install blank cover plates.

What do wire caps do?

The most common type of wire connectors are little round little plastic caps, often called wire nuts, that twist over the bare ends of wires to make tight connections. Wire nut connections are reversible—they can be unscrewed in the future in the event that you need to replace any device.