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Minimum IR values

OCB99

Hi everyone, 

First time poster so try and take it easy on me Grin

been looking at threads on this forum for quite a while now and it’s been a great help during my training so thanks everyone.

Just wanted to know your opinions on IR testing and how to apply the minimum value stated in BS7671. The regs state that the values in table 64 applies to a distribution circuit with all final circuits connected. Would that mean if on an EICR for example there were 10 circuits each measuring 9Mohms between two conductors (Very unlikely I know) it would be a fail as the total resistance for 10 circuit would be theoretically 0.9Mohm?

Also would this apply to simple installations where the consumer unit is directly connected to the origin, essentially classing the DNO cable as a ‘distribution circuit’.

Thanks in advance.

Parents

  • Thanks for the replies everyone it’s greatly appreciated Grin

    The only thing slightly confusing is that the distribution circuit supplying all of the final circuits should be tested with all the final circuits connected according to 643.3.2, which could result in all the final circuits being satisfactory but the distribution circuit itself failing due to the parallel resistance of all circuits giving a reading <1Mohm. I hope that makes sense.

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  • Thanks for the replies everyone it’s greatly appreciated Grin

    The only thing slightly confusing is that the distribution circuit supplying all of the final circuits should be tested with all the final circuits connected according to 643.3.2, which could result in all the final circuits being satisfactory but the distribution circuit itself failing due to the parallel resistance of all circuits giving a reading <1Mohm. I hope that makes sense.

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