Method of manufacturing THHN electrical cable, and resulting product, with reduced required installation pulling force

An improved process of manufacturing a finished THHN cable assembly of the type comprising a central conductor core and a surrounding sheath of at least one outer layer of nylon material defining the exterior surface of the finished cable, said process comprising:

• (a) combining a silicone based pulling lubricant with said nylon material prior to the formation of said outer layer of said sheath, the silicone based pulling lubricant being of a concentration sufficient to reduce the required installation pulling force of the cable during its installation, and further of the type which permeates throughout the at least one outer layer of the sheath to be available at the said exterior surface as said THHN cable is pulled along an installation surface;
• and
• (b) extruding said combined silicone based pulling lubricant and said nylon material to surround said central conductor core with at least said outer layer.

An improved process of manufacturing a finished THHN cable of the type comprising a central conductor and a surrounding sheath, at least an outer portion of which is of nylon material, the process comprising introducing a erucamide pulling lubricant into the sheath prior to the completion of the manufacturing of the finished THHN cable of a concentration of between about 0.25% and 0.85%, by weight, to be available at the exterior surface of the sheath, and sufficient to reduce the required pulling force during the THHN cable's installation.

In a THHN electrical cable of the type comprising a conductor core and a sheath surrounding said conductor core, in which the sheath has at least its exterior portion formed of nylon material, an improvement in which a silicone based pulling lubricant, introduced in said material during the manufacture of the cable but prior to the formation of said sheath, permeates throughout at least said exterior portion of the sheath to be available at the exterior surface of said sheath as said THHN cable is pulled along an installation surface, and in a concentration sufficient to reduce the required installation pulling force.

An improved process of manufacturing a finished THHN cable assembly of the type comprising a central conductor core and a surrounding sheath of at least one outer layer of nylon material defining the exterior surface of the finished cable, said process comprising:

• (a) combining a erucamide pulling lubricant with said nylon material prior to the formation of said outer layer of said sheath, the erucamide pulling lubricant being of a concentration sufficient to reduce the required installation pulling force of the cable during its installation, and further of the type which either permeates throughout, or migrates through, the at least one outer layer of the sheath to be available at the said exterior surface as said THHN cable is pulled along an installation surface;
• and
• (b) extruding said combined erucamide pulling lubricant and said nylon material to surround said central conductor core with at least said outer layer.