APPLIANCE WIRING MATERIAL
Subj.758 Section 4 Page 4257 Issued:1976-03-02
Revised:2019-11-07
Style 4257 Multiconductor Cable with Extruded Non-Integral Jacket

Rating90 deg C, 300 Vac, Cable flame.
Conductor30 AWG minimum, solid or stranded round, tinned or bare copper.
InsulationLabeled or complying with manufacturer's AWM procedure, 8 mils min average.
AssemblyIndividually insulated conductors or groups of insulated conductors cabled together. All conductors in any group twisted together. If more than one group is used, groups shall also be twisted together. The length of lay of the twisted conductors or groups is not specified. Fillers may be used in a cable but are not required. A barrier layer, if employed, may be a fibrous wrap serving, or braid; paper; nylon; oriented polyethylene terephthalate; or a thermoplastic-tape wrap. Such a barrier layer would serve to protect the cable during further processing, and would be applied immediately over the twisted assembly of individual conductors or groups of conductors.
ShieldOptional.
JacketExtruded NR - NEOPRENE
dia of cable under jacket
0.425 inches or less45 mils min average40 mils min at any point
0.426-0.700 dia60 avg48 min
0.701-1.500 dia78 avg72 min
StandardAppliance Wiring Material UL 758.
MarkingGeneral.
UseExternal interconnect of electronic equipment.

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