Unplug the wires or cable from any wall outlet if you are repairing electrical wiring. Disconnect the wires or cable from any device connected to an electrical supply.
Turn the wire or cable over in your hands to inspect. Consider replacing the wiring if it is nicked, frayed or visibly damaged. If the wires are intact and only the rubber coating is damaged or missing, continue with the repair.
Press the edge of the rubber silicon electrical tape over one end of the area to be repaired. Hold the tape to the wires or cable with your thumb.
Pull the roll of tape gently to create tension as you wrap the tape around the bare wires or cables. Overlap each wire wrap slightly to prevent any gaps in coverage.
Cut the end of the tape from the roll with scissors and press the edge firmly onto the wire or cable.