3M Scotch Super 33+ Electrical Tape - One of the best electrical tapes available from a name you can trust - 3M. UL listed and CSA certified. Primary electrical insulation for all wire and cable splices rated up to 600 volts and for fixture and wire splices up to 1000 volts. Applies at 0°F to 221°F (-18°C to 105°C). 3/4" x 66' - 7 MIL.