Guidance Note 3 Inspection and Testing 2022 Appendix C

I'd agree that usually the Neutrals are in the middle of the metering, but the picture does clearly get a concept across well; these are the two cables that need to be clamped together in order to get an earth fault leakage test done.

That will depend on the meter - in all of the single phase ones  that I can recall seeing open,  the neutral is a solid bar connecting the inner terminals - so yes in that drawing, the brown and blue on the LHS are swapped, as you say . But maybe some meters are wired like that drawing and I've just not met one yet. 

Or perhaps the artist's house suffers polarity reversal and we should ask them to check ?!

Mike.

mapj1 said:

Or perhaps the artist's house suffers polarity reversal

Only a court of law can decide this.  lol

I think, perhaps;  you are confusing me with someone else. I'm the one who is happy to offer an opinion base purely on what feels reasonable when considering the situation technically. The current regs may or may not be adequate, necessary or even desirable in some situations.
That does lead to the odd hard to justify cock-up,  but the limit of 'possible' is found by going beyond, and then winding in quick when things don't work. 

Mostly I'm in a R and D environment not standard installations.
Mike.

Just as an aside, I am using this method at every opportunity during periodic inspections

.

Pretty good at identifying issues but whilst the above indicates a definite problem, it is a tad more difficult to act on a maximum level. 

Sergio Fernandez said:

Is the diagram / picture incorrect? 

Probably not as intended ... see for example Figure 2.31 in the same publication ... 

Thank you for pointing this out, I'm sure that Figure in Appendix C can be revised for the next Edition.

Does that mean I will be added to

 
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Section ?

While the polarities are correct at the meters, (although the colours/ tapes are reversed at the terminals), BOTH consumer units are indeed reverse polarity. Disconnection of the main fuse is required by the DNO, and the electrical installation given a thorough check over, including outside buildings/circuits.

Is the N going through the clamp?

  - Andy.

Sergio Fernandez said:

Does that mean I will be added to

 
Acknowledge contributors

You gotta try