US2034532A - Electrical conductor - Google Patents

Description

Original Filed Dec. 18, 1925 Y A. 6. 2R @www A 2S ATTORNEY Patented Mar. 17, 1936 UNITED s'rn'rlazs PATENT OFFICE ELECTRICAL CONDUCTOR Dwight R.. G. Palmer, South Orange, N. J., as-

signor to General Cable Corporation, New York, N. Y., a corporation of New Jersey 1 Claim.

My invention relates broadly to electrical conductors and more particularly to a construction of electrical conductor particularly adapted for use in the wiring of buildings and residences for 5 power and lighting current supply to outlets throughout the building.

One of the objects of my invention is to provide an electrical assembly which may be manufactured more inexpensively than assemblies heretofore employed for performing the same service, where less material is required in the manufacture of the assembly, and smaller overall size of the assembly is secured than has heretofore been possible in wiring constructed for a similar purpose.

Another object of my invention is to provide a conductor in which a housing sheath is arranged to enclose an insulated and uninsulated electrical conductor where the uninsulated electrical conductor lies adjacent the interior wall of the sheath, the insulated conductor being for the purpose of carrying current while the uninsulated conductor serves for the grounded side of the circuit, that is the neutral conductor, and for polarity identication.

By reason of the construction of the conductor which I provide, I am enabled to` save considerable material in its manufacture and yet provide a safe electrical conductor for performing all of the functions of more expensive conductors here= tofore available in the art.

This application is a division of my copending application for Electrical conductors, led December 18, 1925, Serial No. 76,182, patented June 11, 1935, No. 2,004,901.

My invention will be more fully understood from the following specification by reference to the accompanying drawing, wherein:

Fig. 1 is a side elevation of a cable partially broken away to illustrate the principle of my invention; and l Fig. 2 is a cross-sectional View taken on the line 2-2 of Fig. 1.

In the standard wiring of buildings orresidences it is customary to employ flexible armored cable constituted by two or more insulated conductors housed within a flexible armor. In two conductor cable one wire conveys the current to the service outlet while the other wire is grounded or is neutral and provides the return channel. Both conductors are generally rubber insulated and are mechanically protected by the use of cotton braids or with other insulating or metallic protection. I provide an insulated metallic conductor and an uninsulated conductor of non-corrosive metal which extends parallel to, adjacent to, or is spiralled around the insulated conductor forming a member adjacent to the insulated conductor or conductors and the inner wall of the armor or sheathing. By virtue of the relatively small diameter of the uninsulated conductor the outer armor or sheathing is substantially smaller in diameter than the diameter of armored cable heretofore required in this work. A substantial saving in the material in the manufacture of the assembly is therefore obtained.

Referring to the drawing in more detail, reference character I designates a metallic conductor; 2 an insulating covering; 3 a braid or braids thereover impregnated or finished with a moisture repellent. A flexible armor or sheath 6 of fibrous material encases the covered conductor I, and interposed between the outer covering 3 and the inner wall of the sheathing 6 I pro-l vide an auxiliary conductor 5 of non-corrosive metal, As represented in Fig. 1, the auxiliary conductor 5 is twisted around the insulated conductor immediately beneath the fibrous pro-- tector 6.

I have found that electrical conductors manufactured in accordance with my invention, described herein, are practical in manufacture and installation and while I have described preferred embodiments of my invention, I desire that it be understood that modifications may be made and that no limitations upon the invention are intended other than those imposed by the scope of the appended claim.

What I claim and desire'to secure by Letters Patent of the United States is as follows:

A non-metallic sheathed, two conductor electrical building cable comprising, in combination, a central conductor to be connected in the high potential side of an electrical circuit, a body of insulating compound enclosing said conductor, a braid enclosing the insulated conductor, a bare neutral conductor of substantially the same crosssection as the central'conductor to be connected with the grounded side of the electrical circuit for carrying the return current disposed helically with a long lay and widely spaced turns about the insulated central conductor over the braid, and a flexible non-metallic protective sheath comprising a braid surrounding the insulated central conductor and the helically disposed bare neutral conductor and constituting the outer covering for the cable.

DWIGHT R. G. PALMER.

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