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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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  • 0

    Chris Pearson: 
     

    What is connected to the tub? If it's all plastic pipes, in and out; I don't think that you need to worry because it isn't an extraneous CP.

    In fact, I don't think that the material of the tub matters: it's the taps which count.

    Yes Chris, metal taps and metal supply pipes to the bath taps.

     

    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. The three phase underground supply cable provides just a single phase and neutral at present to a grey three phase head. The Ze reading does seem very low for a rural village location.

    Edit. Add. Or we could have a P.M.E. supply here but the N-E link is external to the property.

     

    Z.

Reply
  • 0

    Chris Pearson: 
     

    What is connected to the tub? If it's all plastic pipes, in and out; I don't think that you need to worry because it isn't an extraneous CP.

    In fact, I don't think that the material of the tub matters: it's the taps which count.

    Yes Chris, metal taps and metal supply pipes to the bath taps.

     

    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. The three phase underground supply cable provides just a single phase and neutral at present to a grey three phase head. The Ze reading does seem very low for a rural village location.

    Edit. Add. Or we could have a P.M.E. supply here but the N-E link is external to the property.

     

    Z.

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