| 摘要 |
A combination mounting cable and electrical conductor for a suspended lighting fixture or other electrical apparatus which provides power to the fixture without visible conductors, formed of at least one insulated electrical conductor, a discrete second insulating layer surrounding the insulated conductor, and movable relative thereto, and a sheath surrounding the second insulating layer, the sheath being capable of bearing the weight of a lighting fixture suspended by the cable. The insulation on the conductor and the discrete second insulating layer are formed of a fluoropolymer material, and the weight bearing sheath is formed of braided or woven strands of metal such as stainless steel. Alternatively, the second insulating layer may be formed of an aramid material or fiberglass, and the inner insulator of any suitable material. In case, depending on the mechanical and dielectric properties of the materials, the two insulating layers need not be relatively movable. In one embodiment, the elements are all coaxial with each other. In a second embodiment, there are at least two insulated conductors in side-by-side relationship surrounded by the discrete second insulating layer and the weigh-bearing sheath.
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