Discuss Max Zs to BS7671 or Manufacturers Spec in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

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ktech

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I've had differing opinions on this.

Say a final circuit Zs falls outside that required by BS7671 but taking the manufacturers data it is within, ie. the manufacturers device exceeds the requirements of BS7671 for disconnection and therefore allows a greater Zs.

An example of this is would be a 100A 60898 Type C with BS7671 max Zs of 0.23. However max Zs of a Moeller PLHT Type C 100A 60898 would be 0.51, taken from manufacturers data in Amtech.

I have come across this on periodics when the circuit would look not to comply on BS data but taking into account the manufacturers specs it is ok.

I asked NICEIC about this and they said it does not comply with BS7671 and is therefore a code 2 - requires improvement. But it is technically safe so what is the problem? Does the regs state anywhere that you can use manufacturers data when available?
 
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ktech

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