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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
    broadgage:

    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.

     


    The Henley's Paper Insulated House Wire catalogue states that the 3/.029 Class YT cable has a SAFE CARRYING CAPACITY OF 7.8 amps. It will probably carry more than that for short periods. It may be something to do with the rubber insulation at the time.


    Out of interest, the 7/.029 cable is rated at 18 Amps safe carrying capacity.


    Z.


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  • 0
    broadgage:

    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.

     


    The Henley's Paper Insulated House Wire catalogue states that the 3/.029 Class YT cable has a SAFE CARRYING CAPACITY OF 7.8 amps. It will probably carry more than that for short periods. It may be something to do with the rubber insulation at the time.


    Out of interest, the 7/.029 cable is rated at 18 Amps safe carrying capacity.


    Z.


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