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Lighting Wiring Consideration.

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I am going to use some Henley Paper Insulated House Wiring cable for a lighting circuit. The manufacturer is W.T. Henley's Telegraph Works Company Ltd., Holborn Viaduct, London E.C.1.I am using their Section CA catalogue.

The cable is called YT type. It is paper insulated house wire.


I am thinking of using 3.029 inch twin cable. It is rated at 7.8 Amps. I will use a 5 Amp fuse in the fuse box.


Q1. What is the cable outer covering made of?


Q.2. What is the weight of the cable per 1,000 yards in cwt?


Q.3. What is the price per 1,000 yards.


The year is 1927, the month June.


Z.


Edit. Some minor typos corrected.
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  • 0
    Why was the old type 3/029 cable only rated at 7.8 amps ? I would have expected at least 10 or 12 amps based on cross sectional area, which is similar to modern 1.5mm. I would expect a rating of less than modern cables, but still at least 10 or 12 amps.

    A couple of guesses - firstly the assumption would be for overload protection by rewireable fuses (course protection in old money) - these days we'd use the 0.725 factor. Then given the natural rubber insulation rather than PVC they probably preferred a slightly lower conductor temerature - so de-rate a little more again.


      - Andy.
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  • 0
    Why was the old type 3/029 cable only rated at 7.8 amps ? I would have expected at least 10 or 12 amps based on cross sectional area, which is similar to modern 1.5mm. I would expect a rating of less than modern cables, but still at least 10 or 12 amps.

    A couple of guesses - firstly the assumption would be for overload protection by rewireable fuses (course protection in old money) - these days we'd use the 0.725 factor. Then given the natural rubber insulation rather than PVC they probably preferred a slightly lower conductor temerature - so de-rate a little more again.


      - Andy.
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