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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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    Chris Pearson: 
     

    I am a little confused regarding the earthing arrangement. If TN, how is the MET connected to the service cable?

    Depending upon the service head, you wouldn't know whether the N-E link has been made inside it, but if there is a link (there or nearby) PSSC and PEFC should be very similar.

    I agree that a Ze of < 1 ohm is unlikely to be TT.

    It seems that not all rural supplies follow the rules.

    There is no green and yellow earthing conductor coming from the service head Chris. The 16.0mm2 green and yellow single comes up from the ground as a single cable. Where it is connected I do not know.

     

    Z.

Reply
  • 0

    Chris Pearson: 
     

    I am a little confused regarding the earthing arrangement. If TN, how is the MET connected to the service cable?

    Depending upon the service head, you wouldn't know whether the N-E link has been made inside it, but if there is a link (there or nearby) PSSC and PEFC should be very similar.

    I agree that a Ze of < 1 ohm is unlikely to be TT.

    It seems that not all rural supplies follow the rules.

    There is no green and yellow earthing conductor coming from the service head Chris. The 16.0mm2 green and yellow single comes up from the ground as a single cable. Where it is connected I do not know.

     

    Z.

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