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Zone 1.

Zoomup

After an N.I.C.E.I.C E.I.C.R. report I attended to see about some remedial work.

The house is TN-S supplied with a Ze of 0.64 Ohms. The main earthing conductor just pulled out when I tugged on it in the presence of the homeowner. Not good.

Anyway, in the bathroom is a cast iron bath tub. Immediately above it is a chrome finish spot light bar, reported to be suitable for zone 1 use. I do not know if it is a Class 1 or 2 fitting at this stage, but the owner will give me details later on.

A person standing in the bath tub can easily touch the metal luminaire as it is very low, mounted on a wooden beam.

Would you bond it to the bath tub pipework?

 

Z.

 

 

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    AJJewsbury: 
     

    Also, I am beginning to think that the supply may be P.N.B. rather than TN-S, as a 16mm2 green and yellow single disappears into the ground at the meter position.

    It could be both TN-S and PNB - especially if it's a single consumer on a transformer. Ze would be the entire loop through the transformer regardless - the position of the N-PE link or indeed the electrode wouldn't make much difference to that.

    The DNO probably want you to regard it as PME in any event - just to allow them to make future alterations without having to worry about consumer's internal arrangements.

      - Andy.

    The installation is an old thatched cottage, previously a pub with many houses nearby, so not isolated. The local transformer, which I have not seen, was renewed a few years ago after a driver crashed into the old one and severely damaged it. There is no P.M.E. sticker at the premises, and the neutral block is solely that.

     

    Z.

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  • 0

    AJJewsbury: 
     

    Also, I am beginning to think that the supply may be P.N.B. rather than TN-S, as a 16mm2 green and yellow single disappears into the ground at the meter position.

    It could be both TN-S and PNB - especially if it's a single consumer on a transformer. Ze would be the entire loop through the transformer regardless - the position of the N-PE link or indeed the electrode wouldn't make much difference to that.

    The DNO probably want you to regard it as PME in any event - just to allow them to make future alterations without having to worry about consumer's internal arrangements.

      - Andy.

    The installation is an old thatched cottage, previously a pub with many houses nearby, so not isolated. The local transformer, which I have not seen, was renewed a few years ago after a driver crashed into the old one and severely damaged it. There is no P.M.E. sticker at the premises, and the neutral block is solely that.

     

    Z.

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