Electrical wire and cable

Details Electrical wire and cable Electrical wire and cable

H - Electricity

01

B

337/66

H01B 7/28 (2006.01) H01B 3/10 (2006.01) H01B 7/29 (2006.01) A61B 17/22 (2006.01) A61M 29/02 (2006.01)

Patent

CA 1241395

ABSTRACT An electrical wire has a conductor formed of a bundle of copper strands. An adherent, electrically insulating, refractory coating extends around the circumference of the bundle but not around the individual strands. Extending around the individual strands is an intermediate layer formed from a metal which acts as a barrier to diffusion of oxygen or copper or both and having a thickness of at least 1.5 micrometres. The intermediate metallic layer may be formed on the copper strands in a number of ways, for instance by electroplating, standard wire cladding techniques such as roll bonding, and by vacuum deposition techniques e.g. sputtering, evaporation, flame spraying, plasma assisted chemical vapour deposition (CVD) or other techniques. The wire is particularly suitable for forming signal integrity cables and circuit integrity cables because, depending on the construction of the wire, when a portion of the cable is subjected to a fire, the refractory coating will pro- vide sufficient insulation between the conductors to enable the cable to operate for a significant length of time even when any polymeric insulation of the wire has been lost.

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