Loading patent…
AssigneeSouthwire Company
InventorsPhilip Sasse, Terry Chambers, Randy D. Kummer, John Armstrong, David Reece, Hai Lam
Estimating the term…
Disclosed are cable types, including a type THHN cable, the cable types having a reduced surface coefficient of friction, and the method of manufacture thereof, in which the central conductor core and insulating layer are surrounded by a material containing nylon or thermosetting resin. A silicone based pulling lubricant for said cable, or alternatively, erucamide or stearyl erucamide for small cable gauge wire, is incorporated, by alternate methods, with the resin material from which the outer sheath is extruded, and is effective to reduce the required pulling force between the formed cable and a conduit during installation.
A method of manufacturing a thermoplastic high heat-resistant nylon-coated (THHN) electrical cable having a reduced installation pulling force through a conduit, the method comprising the steps of:
An electrical power cable of a type comprising a conductor and a protective sheath surrounding said conductor, in which the protective sheath has an interior portion formed of a polyvinyl chloride polymer and at least an exterior portion surrounding, contacting, and forming a coating around the interior portion and formed of a layer of a nylon resin and a pulling lubricant comprising silicone introduced with the nylon resin during manufacture, the pulling lubricant to be available at an exterior surface of an electrical power cable when pulled through a conduit for reducing a required installation pulling force at the exterior surface of the electrical power cable for installation of the electrical power cable through the conduit, the electrical power cable having a characteristic that an average amount of force required to install said electrical power cable through an arrangement of the conduit is less than an average amount of force required to install a cable of a same cable type, shape and size having substantially no lubrication at an exterior surface of the cable of the same cable type, shape and size, through said arrangement of the conduit, the arrangement of the conduit being defined as a PVC conduit that is sized to accommodate said electrical power cable and an initial 10 foot straight section of conduit, followed by a first 90° bend having a left-orientation, followed by a second 90° bend having a right orientation, followed by a 30 foot straight section of conduit, followed by a third 90° bend having a right-orientation, followed by a 5 foot straight section of conduit, followed by a fourth 90° bend having a right-orientation, followed by a 10 foot straight section of conduit.
Dependencies are inferred from the claim text.