| Customization: | Available |
|---|---|
| Type: | Insulated |
| Conductor Type: | Stranded |
|
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This specification describes single conductor THWN or THHN, a general purpose building wire insulated
with polyvinyl chloride (PVC) and covered with a tough protective sheath of nylon intended for lighting and power
circuits at 600 Volts or less, in residential, commercial and industrial buildings. The wire may be operated at 90°C
maximum continuous temperature in dry locations and 75°C in wet locations and is listed by Underwriters Laboratories
The following standards form a part of this specification to the extent specified herein:
Underwriters Laboratories Standard 83 for Thermoplastic Insulated Wires.
Underwriters Laboratories Standard 1063 for Machine-Tool Wires and Cables (Stranded items only) .
Underwriters Laboratories Standard 758 for 105°C Appliance Wiring Materials (Stranded items only).
CSA Standard C22.2 No. 75 and Electrical Bulletin No. 1451 for Type T90 Nylon or TWN75.
Conductors shall be solid , Class B or Class C stranded, annealed uncoated copper per UL Standards 83 or 1063.
Each conductor shall be insulated with PVC and sheathed with nylon complying with requirements of UL Standard
83 for Types THHN or THWN, UL Standard 1063 for Type MTW and CSA C22.2 No. 75 for T90 Nylon. In addition,
Types THWN or THHN shall comply with the optional Gasoline and Oil Resistant II rating of UL Standard 83. The
insulation on stranded sizes shall also comply with UL requ irements for 105°C Appliance Wiring Material.
The average thickness of PVC insulation, for a given conductor size, shall be as specified in UL Standard 83 for
Types THWN or THHN. The minimum thickness at any point, of the PVC insulation, shall be not less than 90% of
the specified average thickness. The minimum thickness at any point of the nylon sheath, shall be as specified in
UL Standard 83 for Types THWN or THHN. The PVC insulation shall be applied tightly to the conductor and shall
be free-stripping .
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