EASY PULL ELECTRICAL CONDUIT

Abstract

An easy pull conduit for receipt of wire and/or wire bundles reduces the resistance to pulling wire and/or wire bundles. The conduit has an inner surface and a boron nitride coating applied to the inner surface. An aluminum EMT conduit having the boron nitride coating exhibits a 55 percent reduction in pull force compared to a bare aluminum conduit. A method for reducing the pull force required to pull wire and/or wire bundles through a conduit is also disclosed.

Claims

1. A conduit for receipt of wire and/or wire bundles, the conduit having reduced resistance to pulling wire and/or wire bundles, comprising: a conduit having an inner surface; and a boron nitride coating applied to the inner surface.

2. The conduit of claim 1, wherein the conduit is an aluminum conduit.

3. The conduit of claim 2, wherein the aluminum conduit is an electrical metal tubing (EMT).

4. The conduit of claim 3, wherein the conduit exhibits a 55 percent reduction in pull force compared to a bare aluminum conduit.

5. The conduit of claim 1, wherein the conduit is rigid metal conduit.

6. The conduit of claim 1, wherein the conduit is an intermediate metal conduit (IMC).

7. The conduit of claim 1, wherein the conduit is a steel conduit.

8. The conduit of claim 1, wherein the conduit is polyvinyl chloride (PVC) or fiberglass.

9. The conduit of claim 1, wherein the boron nitride is applied in a carrier.

10. The conduit of claim 9, wherein the carrier is a liquid carrier.

11. The conduit of claim 10, wherein the boron nitride is present in a concentration of about 85 percent in the liquid carrier.

12. The conduit of claim 10, wherein the carrier is water.

13. The conduit of claim 1, wherein the boron nitride is applied as a powder.

14. A method for reducing the pull force required to pull wire and/or wire bundles through a conduit, comprising: providing a conduit having applied to an inner surface thereof boron nitride; and pulling a wire or wire bundle through the conduit.

15. The method of claim 14, wherein the boron nitride is applied by brushing, spraying, dipping or powder coating.

16. The method of claim 14, wherein the boron nitride is applied in a carrier.

17. The method of claim 16, wherein the boron nitrile is present in a concentration of about 85% by weight of an applied coating.

18. The method of claim 16, wherein the carrier is water.

19. The method of claim 14, wherein the boron nitride is applied as a powder.

Description

DESCRIPTION OF THE DRAWINGS

[0015] Various embodiments of an electrical conduit through which cable is readily pulled are disclosed as examples and are not limited by the figures of the accompanying drawings, in which like references may indicate similar elements and in which:

[0016] FIG. 1 is a perspective view of a run of several electrical conduit; and

[0017] FIG. 2 is perspective view of an easy pull electrical conduit.

DETAILED DESCRIPTION

[0018] While the present disclosure is susceptible of embodiments in various forms, there is shown in the drawings and will hereinafter be described a presently preferred embodiment with the understanding that the present disclosure is to be considered an exemplification and is not intended to limit the disclosure to the specific embodiment illustrated.

[0019] A novel electrical conduit has a greatly reduced pulling force required to pull wire and wire bundles (collectively wire) through the conduit. The installation of electrical cable and wire in electrical raceways such as electrical conduit is often required by building codes and construction standards. The wire and/or wire bundles are pulled through the conduit after the conduit is installed in place.

[0020] FIG. 1 illustrates a run 10 of several steel electrical conduits. Wire pulling is more difficult in some materials than others. For example, it is easier pulling wire through steel and galvanized conduit than it is pulling through aluminum conduit. Nevertheless, wire bundle pull force is a major concern, and reducing the force needed for wire pull reduces the time and labor required for wire installation. As such, lubricants are often applied to wire or wire bundles at a job site to reduce the resistance to pulling wire and wire bundles.

[0021] In an embodiment, as illustrated in FIG. 2, an electrical conduit 12 has boron nitride applied as a coating 14 to an inner surface of the conduit. The conduit 12 can be rigid metal conduit which is a thicker wall tubing, electrical metal tubing (EMT) which is rigid, but is a thinner wall tube, or intermediate metal conduit (IMC) which, as the name implies falls between the rigid conduit and the EMT. The conduit material can be aluminum, steel, galvanized and the like. Other conduit materials include polyvinyl chloride (PVC), fiberglass, and other suitable materials.

[0022] The boron nitride can be provided in a concentrated form in a liquid carrier. In an embodiment, the boron nitride can be at a concentration of about 85 percent, and may be at a higher concentration than 85 percent. One suitable carrier is water. The boron nitride can be applied similar to paint application. It can be applied by brush, sprayed, dipped, and the like. It is also anticipated that the BN can be applied as a powder using known powder coating methods.

[0023] As noted above, wire bundle pull force is a major concern in electrical wiring installation. This is especially true for aluminum conduit and EMT.

[0024] Samples of conduit with and without BN were tested to determine the decrease in wire pull in pounds force of the BN coated samples.

[0025] Three samples were tested. In each, wire as pulled through a ¾″ EMT conduit in a lengthy conduit run that included four (4) 90 degree bends. The tested conduit included: (1) steel conduit; (2) bare aluminum; and (3) aluminum conduit with a boron nitride coating. The pull force required for each was as follows:

TABLE-US-00001 Material Pull force (pounds force) Steel conduit 80.36 lbf Bare aluminum 130 lbf Aluminum with BN 59.3 lbf

[0026] From the results above, it can be seen that the use of boron nitride significantly reduces the pull force required for pulling wire. The BN coated aluminum conduit exhibited about a 55 percent reduction in pull force required to pull wire. The steel conduit, which exhibited a pull force of about 62 percent of the bare aluminum, exhibited a pull force about a 35 percent greater pull force than the BN coated aluminum conduit.

[0027] A method for reducing the pull force required to pull wire and/or wire bundles through a conduit, includes providing a conduit having applied to an inner surface thereof boron nitride and pulling a wire or wire bundle through the conduit.

[0028] The method can include applying the boron nitride by brushing, spraying, dipping or powder coating. The boron nitride can be applied in a carrier, and can be present in a concentrated form of an applied coating. The concentration can be about 85 percent, and may be at a higher concentration than 85 percent. One suitable carrier is water. The boron nitride can be applied similar to paint application. It can be applied by brush, sprayed, dipped, and the like. It is also anticipated that the BN can be applied as a powder using known powder coating methods.

[0029] It will be appreciated from the pull force testing results that the use of BN significantly reduces the pull force required for wire pull through conduit. It is anticipated that reduced pull force will be required for all types of conduit, and may eliminate the need for lubricants to reduce the resistance to pulling wire and wire bundles.

[0030] It will also be appreciated that the boron nitride coating is a non-flammable, non-hazardous, non-reactive material, which makes it ideal for use in the electrical conduit as disclosed herein. One benefit when used with aluminum conduit is that the entire system (e.g., the conduit and BN coating) are sustainable and recyclable thus providing an ecological benefit and a sustainable marketplace product.

[0031] In the present disclosure, the words “a” or “an” are to be taken to include both the singular and the plural. Conversely, any reference to plural items shall, where appropriate, include the singular. All patents and published applications referred to herein are incorporated by reference in their entirety, whether or not specifically done so within the text of this disclosure.

[0032] It will also be appreciated by those skilled in the art that any relative directional terms such as sides, upper, lower, top, bottom, rearward, inboard, forward, outboard and the like may be for explanatory purposes only and may not be intended to limit the scope of the disclosure.

[0033] From the foregoing it will be observed that numerous modifications and variations can be made without departing from the true spirit and scope of the novel concepts of the present disclosure. It is to be understood that no limitation with respect to the specific embodiments illustrated is intended or should be inferred.