Electricity: conductors and insulators – Conduits – cables or conductors – Conductive armor or sheath
Patent
1989-09-12
1991-01-22
Nimmo, Morris H.
Electricity: conductors and insulators
Conduits, cables or conductors
Conductive armor or sheath
156 51, 156 56, 174105SC, 174107, 174108, H01B 722
Patent
active
049863720
ABSTRACT:
An electric cable with spirally wrapped wires and wire-retaining strips thereon. The cable includes an insulated electrical conductor, an extruded semiconductive insulation shield overlying the insulated electrical conductor, a plurality of strips extruded and fused onto the insulation shield, and a plurality of wires wrapped around the insulation shield and the strips with sufficient tension to partially embed them into the strips to retain them therein and resist slippage. This arrangement also permits the selection of a first material having predetermined properties for the insulation shield and a second material for the strips having different properties from the first material composing the insulation shield. In one embodiment, the material selected for the strips has a higher softening or melting point than the softening or melting point of the material selected for the insulation shield. This embodiment reduces the pressure of the wires on the insulation shield to prevent indentation of the insulation shield. In another embodiment, the material selected for the strips has a higher coefficient of friction than the coefficient of friction of the material of the insulation shield and/or is a softer material than the material composing the insulation shield to further decrease the chances of slippage of the wires.
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'Hubbell Incorporated
Goodman Alfred N.
Nimmo Morris H.
Presson Jerry M.
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