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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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    So, why does the first paragraph in 701.415.2 require supplementary bonding to the C.P.C. supplying Class 1 and Class II equipment?

    That way the exposed metalwork of Class I appliances is bonded, the metalwork of Class II appliances isn't (thus maintaining the advantages of Class II not importing fault voltages), but should the householder change a Class II fitting for a Class I one, the new exposed metalwork is included in the bonding.

     So basically the same logic as running a c.p.c. to Class II equipment (even though it obviously doesn't need it) - see note to 412.2.3.2.

       - Andy.

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  • 0

    So, why does the first paragraph in 701.415.2 require supplementary bonding to the C.P.C. supplying Class 1 and Class II equipment?

    That way the exposed metalwork of Class I appliances is bonded, the metalwork of Class II appliances isn't (thus maintaining the advantages of Class II not importing fault voltages), but should the householder change a Class II fitting for a Class I one, the new exposed metalwork is included in the bonding.

     So basically the same logic as running a c.p.c. to Class II equipment (even though it obviously doesn't need it) - see note to 412.2.3.2.

       - Andy.

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