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Unusual cable?

AncientMariner
Some people collect stamps, I collect cable. Preferably as short encapsulated paperweights, although I do have others, such as a piece of TAT1 and a piece of the original transatlantic telegraph cable of 1866.


One of my paperweights is a 6-core lead covered cable, each core 0.125 sq. inches copper rated at 11,000 volts WP (which I guess is Working Pressure which translates to Working Voltage) It was produced for the City of Sheffield by the Western Electric Company London. No date given.


Why use a 6-core cable? Seems to be putting all ones eggs in one basket if used for a two circuit system. Had it been for a lower voltage, then perhaps an ac feed to a mercury arc rectifier, but surely not at 11 kV?

Clive
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    There's still plenty of this in the ground, still serving our communities, even though the cores are now generally jointed together and protected more conventionally. The giveaway for split conductor is generally that the pairs of cores are lightly insulated from each other.


    I'm sure you'll all realise that, at the time, these were transmission mains, so they deserved decent protection. Split conductor was, in some ways, a cheap and cheerful alternative to full unit protection (eg Merz Price). At least in the northeast, it was used only for a few years after the Great War, after which we reverted to unit schemes


    I suspect that there was also a degree of making a virtue out of necessity: if the breakers available at the time were relatively small, then it would make sense to use two breakers per circuit
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    There's still plenty of this in the ground, still serving our communities, even though the cores are now generally jointed together and protected more conventionally. The giveaway for split conductor is generally that the pairs of cores are lightly insulated from each other.


    I'm sure you'll all realise that, at the time, these were transmission mains, so they deserved decent protection. Split conductor was, in some ways, a cheap and cheerful alternative to full unit protection (eg Merz Price). At least in the northeast, it was used only for a few years after the Great War, after which we reverted to unit schemes


    I suspect that there was also a degree of making a virtue out of necessity: if the breakers available at the time were relatively small, then it would make sense to use two breakers per circuit
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