APPLIANCE WIRING MATERIAL
Subj.758 Section 2 Page 2724 Issued:1975-03-10
Revised:2012-01-19
Style 2724 Multiple-conductor cable using non-integral jacket (Heating Cable).

Rating150 deg C, 600 Vac, Horizontal Flame.
ConductorResistance wire, 18 AWG - 12 AWG, stranded.
InsulationExtruded FEP. 10 mils minimum average thickness, 8 mils minimum thickness at any point.
AssemblyOver 2 or 3 FEP insulated conductors laid assembly parallel with a 5 mil minimum thickness at any point wall of FEP is extruded to form a parallel cord. This cord is now prepared for the spiral wound heating element. This is done by carefully removing the FEP insulation along the length of the outer conductors so as to bare the copper conductor for approx 1/2 in widths at periodic intervals. A spirally wound Nickel Chromium or other type of resistance wire is then carefully wound the length of the cord. By varying the distance between contacts with the conductors, the number of turns per inch of resistance wire is then carefully wound the length of the cord. By varying the distance between contacts with the conductors, the number of turns per inch of resistance wire and the AWG size (resistance) of the spirally wound wire, different wattages per foot per service voltage can be obtained. A third conductor may be placed parallel to the assembly described above. Heating Element - Nickel Chromium, copper alloy or other suitable resistance wire is spirally wound around the insulation; the AWG size of wire, number of turns, length between contact with the copper conductor are dependent upon the wattage demand and the voltage used to energize the cable.
JacketExtruded FEP. 20 mils minimum average thickness, 18 mils minimum thickness at any point.
ShieldOptional.
CoveringOptional - Extruded FEP. 13 mils minimum thickness at any point.
StandardAppliance Wiring Material UL 758.
MarkingGeneral.
UsePipe heating cable where the acceptability of the combination is to be determined by Underwriters Laboratories Inc.

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