Hybrid cable assembly with internal nylon jacket
A cable cable containing a ground conductor and an insulated conductor wherein the insulated conductor includes a metallic conductor, an insulated material enclosing the metallic conductor, and a nylon jacket surrounding the insulated material. A binder encircles the ground conductor and the insulated conductor and a jacket surrounds the binder.
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1. Field of the Invention
The present invention relates generally to electric wire and cable, and more particularly, to the hybrid cable assemblies.
2. Description of Related Art
Underwriters Laboratories (“UL”) cable and cable criteria include the criteria for Tray Cable (“TC”) and Service Entrance cable (“SE Cable”). These standards set forth the constraints for building and/or usage of the TC and SE Cable.
Construction of TC is covered by UL 1277, and is not allowed by code to be set up outside of raceways, direct burialcable and cable trays. It’s not permitted to be set up in a building with no in stated raceway or cable tray.
SE Cable constructions are covered by UL 854, and is designed chiefly for above ground electrical cable installations to home supply panels or panel-to-panel between multi-family dwellings. SE Cable structure is permitted forinterior/building use and some exterior use without the constraints of raceways and/or cable trays. SE Cable isn’t permitted to be installed underground. SE Cable includes SE-R, or Form R, cable, which further needs at least four (4) conductors forinside use.
To comply with all the UL standards, electric installers installing both TC and SE Cable (or even SE-R Cable) must purchase these kinds of wire separately and keep these different wire types at the jobsite. Currently, multiple wire types must bepurchase and maintained as one wire type does not satisfy the constraints of the UL 1277 and UL 854 and consequently can’t be installed for the purposes of the two. There are various differences between TC and SE-R Cable are as follows: TC traditionally includes amore robust jacket, but no necessity for a buffer; SE-R Cable requires a fiberglass wrap beneath the jacket to add extra security; and there are also various moisture ratings like a cable must be rated”moist” or”dry” and pass theappropriate temperature and moisture exposure tests until it’ll be permitted in certain areas.
According to the prior art, two different cable lengths of 2 different cable constructions were required to complete an electrical installation covering both places, or additional infrastructure (raceways, cable trays, etc.) were demanded toaccommodate use of TC everywhere. When using different constructions, appropriate connectors and electrical boxes are required at connection points, raising the cost of the undertaking. Further, costs and time are increased for every wire constructionsat a work website.
Therefore, a need exists for a hybrid cable that complies with the structure and use requirements of both UL 1277 and 854. Such a hybrid cable would allow setup of a single cable in-place of SE-R Cable or TC with no switchingproducts or requiring additional infrastructure.
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