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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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    Has anyone checked what the supplier deems acceptable?  I have no idea about industrial installations, but a couple of hundred hards of buried cable protected only by the supplier's fuse wouldn't be accepted on a domestic install.

  • 0 in reply to Simon Barker

    thanks, Simon

    since the supply regs changed in 1988, I'm not sure that the supplier/distributor can mandate what happens after their protective device. I have seen some long runs of 25 SWA and even bare wire overhead protected only by a cut-out fuse

    Dave

  • 0 in reply to Dave Miller

    Well they can refuse a new supply, and generally do round here, with anything more than about 3m of anything after their fuse, although another fuse of the same value seems to make them happy despite really adding nothing to the breaking characteristics. ...
    The installation has to be a lot worse to justify disconnection of an existing supply however, which is probably good, as there are a lot of dodgy looking set ups that predate the current regime 

    In the end its the DNO's call, and will depend a bit on the opinion of the local area chaps.

    Mike.

  • 0 in reply to mapj1

    thanks, Mike

    I'm sure I can talk the distributor around, but I'm still concerned about making sure that this installation complies with the wiring regs. specifically, I need to clarify what clearance times the regs require for protection against electric shock by ADS (following your earlier comment) and whether the regs allow use of the distributor's protective device to achieve such ADS

    if there's another way to make the installation safe and demonstrate compliance with the wiring regs for protection against electric shock, then I'd welcome any suggestions

    Dave

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  • 0 in reply to mapj1

    thanks, Mike

    I'm sure I can talk the distributor around, but I'm still concerned about making sure that this installation complies with the wiring regs. specifically, I need to clarify what clearance times the regs require for protection against electric shock by ADS (following your earlier comment) and whether the regs allow use of the distributor's protective device to achieve such ADS

    if there's another way to make the installation safe and demonstrate compliance with the wiring regs for protection against electric shock, then I'd welcome any suggestions

    Dave

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