APPLIANCE WIRING MATERIAL
Subj.758 Section 2 Page 20530 Issued:1987-04-23
Revised:2012-04-17
Style 20530 Multiple conductor cable using non-integral jacket

Rating200 deg C, 600 Vac, Horizontal flame.
Conductor18 AWG - 12 AWG strands over 0.015 in stranded. Heating Element - Nichrome, 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.
InsulationExtruded FEP, 10 mils min average, 9 mils minimum at any point.
AssemblyThree or four conductors; The three conductor parallel cord is now prepared for the spiral wound heating element. This is done by carefully removing the FEP insulation along the length of the cord so as to bare the copper conductor for approx 0.5 in widths at periodic intervals. A spirally wound nichrome 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 urns per inch of resistance wire and the AWG ize (resistance) of the spirally wound wire, different wattages per foot per service voltage can be obtained. Insulation is built with a heating element and jacket.
ShieldOptional.
CoveringOptional - 13 mils min at any point of extruded fluorinated ethylene propylene (FEP).
JacketExtruded FEP, 20 mils min average, 16 mils minimum 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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