Electricity: conductors and insulators – Conduits – cables or conductors – Insulated
Patent
1986-06-24
1987-04-21
Nimmo, Morris H.
Electricity: conductors and insulators
Conduits, cables or conductors
Insulated
174121A, 428389, H01B 702
Patent
active
046598715
ABSTRACT:
Polymeric cladding for elongate substrates, preferably electrical conductors, comprises an inner layer and an outer layer, the outer layer being a cross-linked polymer composition filled with halogen-free particulate inorganic flame-retardant filler which has been treated with material which increases the elongation to break of the composition at 200.degree. C. to at least 50%. The enhanced elongation enables the cladding better to resist burning, possibly by reducing the tendency for the outer layer to split when exposed to fire. Bundles of insulated electrical wires may be wrapped in mineral tape, preferably mica tape, to provide circuit integrity cables which are significantly smaller and/or lighter than previously known.
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Murphy Richard J.
Smith Timothy S.
Burkard Herbert G.
Nimmo Morris H.
Raychem Limited
Rice Edith A.
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