Certainly went on at least to the mid-1950s in many areas -- and a very neat job they made, with buckle clips.
John
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13 years ago
Dates for different electrical cable types
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13 years ago
If it is wired directly into heaters, then it ought to be a heat resisting rubber. The most likely is butyl rubber, which has been around since the 1930s. All the heat resisting rubbers are also highly resistant to aging so, as you say, the general rule does not apply. However, the cost makes it extremely improbably that anyone is going to use butyl rubber for a complete installation.
Colin Bignell