APPLIANCE WIRING MATERIAL
Subj.758 Section 2 Page 20829 Issued:1994-02-24
Revised:2012-05-02
Style 20829 Multiple-conductor cable using non-integral jacket.

Rating250 deg C, 600 Vac, Horizontal flame.
Conductor18-10 AWG, nickel-plated copper strands.
InsulationExtruded PFA or extruded MFA, 20 mils minimum average thickness, 18 mils minimum thickness at any point.
AssemblyOver two insulated conductors laid parallel, a 5 mil min at any point wall of PFAor MFA is extruded to form a two conductor parallel cord. This cord is now prepared for the spiral wound heating element. This is done by carefully removing the PFA or MFA insulation along the length of the cord so as to bare the copper conductor for approx 1/2 in widths at periodic intervals. A spirally wound nichrome or the type of resistance wire is then carefully wound the length of the core and may be soldered to the exposed conductor. 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.
CoveringOptional. Fiberglass braid.
JacketExtruded PFA or extruded MFA, 20 mils minimum average thickness, 18 mils minimum thickness at any point.
CoveringOptional. Fiberglass braid.
BraidOptional.
CoveringOptional. Extruded PFA or extruded MFA, 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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