frayed electrical wire behind kitchen stove/microwave

Ive just moved into a 95' home and attempted to replace the hood over the range with a microwave. I disconnected the hood, cut an opening for the box and was attempting to install the box when i realized that the drywall was broken open enough and i couldnt lock the paddles in place to secure the box. I called a friend who had recently done this and he told me to screw a drywall screw through the box into the side of the 2x4 behind the wall. when i did this the threads on the screw frayed the insulation to either the range or hood wire that was stapled to the 2x4. Im not sure which one and there doesnt appear to be any damage to the wire itself. Is there any repair i can make to this or will i have to rip everything out to replace the wire? Please Help!
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There is a good possibility that you did no damage to the cable, especially if you only nicked the outer sheath. The bigger question is whether you ran a dedicated circuit for the microwave as is required or are you attempting to use the existing branch circuit that fed the hood.

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i am using the existing wiring that was used for the hood but checked all outlets in kitchen after i turned off the breaker and did not find any other connections
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As per 1995 NEC you wouldn't find any of the kitchen outlets on that circuit. You would however find lights and possibly outlets in other rooms connected to it. Unless you have a dedicated circuit, you will probably have trouble

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will electrical tape fix the problem in this case
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If you haven't damaged the copper, Tape will work fine

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the breaker box says kit gfci & island hood. if there are other circuits connected to it, it should trip are gfci right. of is there a chance of fire
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I wouldn't worry about fire, just overloading the circuit and tripping the breaker. The island hood should not be wired to any kitchen outlets, so check carefully to find what may be on the circuit that your using for the microwave.

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thank you so much for your help, i have just one more question, i went to go check the wire one last time and the wire is pinched between the 2x4 and the drywall going to the other side of the cabinet. is tape absolutely necesary (probably so) i just dont see how i can wrap the tape around the wire
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I wouldn't worry about it unless you've cut it to the point that copper is exposed.

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