![]() Once the hole is cut in the wall for the box, feed the cable (or cables) out through the wall opening.īefore feeding the cable into the old work box, use a cable stripper to remove about 6 inches of the outer vinyl sheathing from the NM-B cable, exposing the conductors and the ground wire. If the cable is already connected on the source side of the circuit, make sure the circuit breaker supplying power to it has been shut off at the main service panel. ![]() At this point, the new cable should be unattached to any electrical devices. There should be 8 to 12 inches of excess cable at the new wall opening. Make sure the new lengths of cable are sized appropriately for the amperage of the circuit. More complicated wiring scenarios may call for two cables. If the new outlet is a simple circuit extension, there will likely be just one cable running from the last outlet location to the new box location.
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