APPLIANCE WIRING MATERIAL
Subj.758 Section 3 Page 3257 Issued:1971-03-26
Revised:2014-09-22
Style 3257 Single Conductor with Extruded Insulation

Rating250 deg C, 10000 Vac, 25000 Vdc, Horizontal Flame.
Conductor22-12 AWG solid or stranded conductor or 36-42 AWG resistance wire spirally wound around a fiberglass core.
InsulationExtruded SR - SILICONE, 78 mils min average, 70 mils minimum at any point. See facing page for compound identification.
CoveringOptional - Treated glass braid. Same as for Type SF-1.
StandardAppliance Wiring Material UL 758.
MarkingGeneral.
UseInternal wiring where not subjected to flexing.

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