Tough rubber-sheathed cable

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A typical Rubber sheath cable. The conductors are actually copper but are coated and look silver.
Cross section. Note the solid core center earth wire and multi strand power wires.

Tough rubber-sheathed cable is a type of cable which normally consists of a black outer sheath of rubber with several conductors inside. The rubber provides an abrasion-resistant, corrosion-resistant, waterproof, protective covering for an insulated electric cable.

Though obsolete in the United States, where it was used circa 1949-1969, it can still be found in current use in the United Kingdom. It is utilized there for its flexible cables when greater mechanical toughness then PVC is required.

When it was introduced, Rubber sheath cable largely superseded lead-sheathed cables and plain conduit wiring, except where mechanical damage was a hazard.

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