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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

    It seems that not all rural supplies follow the rules.

    Well indeed. Sounds like TNS in some form (pure or PNB) 1 ohm is probably a lower electrode resistance than the pole pig alone, let alone that plus any house electrode in series.

    There is always an  NE ink that is external.. The great unknown is there may be more than one .

    That GY presumably picks up the cable outer at a buried joint.

    How old is the 3 phase cable - old enough to be PILC ? maybe TNS

    If its consac treat as PME.

    Mike

Reply
  • 0

    It seems that not all rural supplies follow the rules.

    Well indeed. Sounds like TNS in some form (pure or PNB) 1 ohm is probably a lower electrode resistance than the pole pig alone, let alone that plus any house electrode in series.

    There is always an  NE ink that is external.. The great unknown is there may be more than one .

    That GY presumably picks up the cable outer at a buried joint.

    How old is the 3 phase cable - old enough to be PILC ? maybe TNS

    If its consac treat as PME.

    Mike

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