I'm buying a house. The attic had a wire with frayed outer insulation. I negotiated repair of the cable. The seller has responded that the repairperson wrapped the fray with rubber electrical tape (I presume 3M tempex or a similar product). It has a continuous max temperature rating of 190 degrees farenheit. Attic temperatures here (Phoenix) reach the 180s during the summer. I have questionable faith in this repair. Is there anything in The National Electric Code that says this repair is improper?