Electrical wiring can typically become damaged during a home renovation project or even through age and typical wear and tear. It is never safe to operate a damaged electrical wire, so repair is needed the moment it is discovered. Cutting out the damaged section and splicing in a new piece will complete the project, as well as keep your electrical wiring up to code.
- Skill level:
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Things you need
- Electrical test probe
- Measuring tape
- Wire cutters/strippers
- Romex electrical cable
- 1 box wire nuts
- Electrical tape
Turn the power off at the main service panel to the circuit with the damaged wiring. Circuit breakers are typically numbered on the inside of the door panel to help you locate the correct one to turn off.
Using the flashlight to see the damaged wiring, touch the test probe against it to determine that the power is off. If no lights on the probe come on, the wiring is "dead" and safe to work on.
Determine the extent of the damaged wire and cut several inches away on ether side of that section. Remove the cut piece.
Strip off three inches of the outer insulation on each end of the existing wire and then strip one inch of insulation off each wire inside the cable.
Measure the distance between the two wires and add 3 to 5 extra inches to allow for slack so it is not pulled too taut. Strip three inches of the outer insulation on each end of the new wire and then strip one inch of insulation off each wire inside the cable.
Attach the new wire to the existing wire. Twist together the same coloured wires in a clockwise direction. Twist a wire nut on each wire connection.
Wrap each wire nut with electrical tape, starting one inch below the bottom of the wire nut, and working up to the top. This will further seal the connections.
Turn the power back on. Touch the test probe to the wiring to check for power.
Tips and warnings
- Avoid serious electrical shock by never working on or attempting to repair an electrical wire without first turning off the power.
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