A box giving access to connections to electric wiring where it is led out of conduits.
- The white wire within the cable that goes to the switch will be made hot, so it must be marked with black electrical tape at the outlet box, to distinguish it from the other neutral wires.
- It is often possible to check for wall insulation by removing the cover plates from electric outlets and shining a flashlight into the crack between the outlet box and the wall board.
- If there is more than one set of wires in an outlet box, they may be on a separate circuit.
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