How to Repair Shielded Wire

Turn off the power at the main fuse box. Open the cable's damaged outer sheathing by hand, and see if the inside plastic-coated wires, as well as the ground, have been damaged in any way. If they have not, wrap electrical insulating tape in a spiral-like fashion around the cable, starting three inches on one side of the damaged area and working across to three inches on the other side of the damaged area. Repeat this three times.

Use a pair of electrical pliers to cut entirely through the cable one inch past the damaged area if the hot, neutral or ground wires have been damaged inside the outer sheathing.

Strip back the outer cable eight inches from the end by carefully running a utility knife blade around the outer sheathing and then pulling it off the interior wires by hand. Use the utility knife as before to strip back one inch of plastic covering from both the hot and ground wires. The wires are now ready to be installed to the electrical appliance.