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origin of the installation

Dave Miller

please forgive this daft question, and I accept that I may be reacting to a non-existent problem

if I'm reading the wiring regs correctly, then we can protect the origin of an installation against overcurrent (whether overload or fault) by using the distributor's protective device with their consent. However, I can't see an equivalent provision to protect the origin of an installation against electric shock by similarly using the distributor's protective device for automatic disconnection of supply

I'm thinking of industrial supplies where the meter is in a substation at the edge of the site and the main DB is in a building on the other side of the car park, so the only protection for a couple of hundred yards of incoming cable is whatever the distributor has fitted at the substation

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    Who owns the substation/transformer?

    I am wondering how this is different from the couple of hundred yards of street main and service cable from the transformer, which is a couple of doors away from my house.

  • 0 in reply to Chris Pearson

    the difference, and therefore perhaps the issue, is who owns that couple of hundred yards of cable

    the supply to your house is through cables owned and operated by the distributor (therefore governed by supply regs rather than wiring regs) to a cut-out in your property. the origin of your installation is a few feet of double-insulated tails from the cut-out through the meter to your DB

    for the project I'm working on, the distributor's responsibility ends at a metered breaker in the substation. the origin of this installation is a couple of hundred yards of cable across the car park to the main DB

  • 0 in reply to Dave Miller
    Dave Miller said:
    for the project I'm working on, the distributor's responsibility ends at a metered breaker in the substation. the origin of this installation is a couple of hundred yards of cable across the car park to the main DB

    Then the origin is at the metered breaker (in the substation).

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