/images/product_buttons/thhn_cu_button.gif/images/southwire_100x70.jpgTHHN Guide SpecificationsTHHNGuideSpecifications.htm
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THHN Guide Specifications

Annex A Type THHN Conductor Specification
26 05 19 WIRE AND CABLE TYPE THHN

PART 1 – GENERAL

1.1 – SPECIFICATION INCLUDES

  
1.1.1 Cable Type: Type THHN/THWN for use as services, feeders and branch circuits

   1.1.2 General Applications: Type THHN/THWN cable may be used in the following general applications per the National Electrical Code®

      1.1.2.1 In Conduit

      1.1.2.2 In Cable Tray

      1.1.2.3 For Services

      1.1.2.4 For Feeders

      1.1.2.5 For Branch Circuits

      1.1.2.6 Wet or Dry Locations

1.2 – SUBMITTALS

  
1.2.1 Product Data: Submit manufacturer’s product data confirming that materials comply with specified requirements and are suitable for the intended application.

   1.2.2 Installation Instructions: Manufacturer’s installation instructions shall be included in submittal. Industry guides may supplement the manufacturer’s instructions.

1.3 REQUIREMENTS

  
1.3.1 Underwriters Laboratories: Type THHN cable shall meet the following Underwriters Laboratories (UL) standards and listings.

      1.3.1.1 UL 83 Thermoplastic-Insulated Wires and Cables

      1.3.1.2 UL 1063 UL Standard for Safety Machine-Tool Wires and Cables

      1.3.1.3 UL listed sunlight resistant in black sizes 2 AWG and larger.

      1.3.1.4 Sizes 1/0 AWG and larger listed for CT USE

      1.3.1.5 Sizes 14 through 1 AWG shall be rated VW-1

      1.3.1.6 Sizes 8 AWG and larger shall be rated THWN-2

   1.3.2 ASTM Standards: Type THHN cable shall meet all applicable ASTM standards.

   1.3.3 Federal Specifications: Type THHN cable shall meet Federal Specification A-A-59544

PART 2 - PRODUCTS

2.1 MANUFACTURER

  
2.1.1 Southwire Company, One Southwire Drive, Carrollton, Georgia, 30119. Website: http://www.southwire.com/

   2.1.2 Senator Wire and Cable, 102 City Hall Ave., Carrollton, Georgia, 30117 Website: http://www.southwire.com/

2.2 CABLE CONSTRUCTION

  
2.2.1 Conductor: The conductor shall be soft annealed copper

   2.2.2 Insulation: The insulation shall be high-heat and moisture resistant PVC.

   2.2.3 Jacket: The jacket shall be abrasion, moisture, gasoline and oil resistant nylon or listed equivalent with

   2.2.4 Self-Lubricating Jacket: Jackets on conductor sizes 2 and larger shall be SIMpull™ or equivalent having integrated self-lubrication such that the cable coefficient of friction is less than or equal to 0.17.

PART 3 - INSTALLATION

3.1 INSTALLATION

  
3.1.1 Manufacturer’s Instructions: Type THHN cable shall be installed per the manufacturer’s published installation instructions. Industry guides may supplement the manufacturer’s instructions.

   3.1.2 Field Support: Manufacturer shall provide, when requested, field engineering support for Type THHN cable installation.

   3.1.3 Manufacturer: Type THHN cable for circuits, feeders and services shall be supplied from a single manufacturer.

   3.1.4 Minimum Bend Radius: Bends in Type THHN shall be made so that the cable will not be damaged.

3.2 SPECIFIC USES

  
3.2.1 Type THHN cable may be used in conduit, raceways and cable trays for services, feeders and branch circuits as specified in the applicable section of the NEC®.

3.3 USES NOT PERMITTED

  
3.3.1 Type THHN cable shall not be used in direct burial applications.

3.4 AMPACITY

  
3.4.1 The ampacity of Type THHN cable shall be determined in accordance with Article 310.15 of the National Electrical Code®. The installation should not exceed the temperature ratings of the terminations and equipment.