Peter Hemmings wrote:

I eventually finished my En-Suite (about a year!).
Got the BI to check and (as I had already mentioned para 1.26) he agreed
to get the Part P done!

Which LA is this?

I await the contractor, but while the BI was here, he seemed to imply
the whole house would be checked, can this be correct?
I can understand the need to check its safe, but I only wanted hime to
check my additional wiring.

Well when adding extra stuff, there are some aspects like main
equipotential bonding that must also be brought up to current standards
if not compliant since that will affect the safety of the work you have
done.

While he vivited he did bring out a meter and checked the earth
impedance (7.5ohm) which he said was good for my installation (overhead
power lines) whi should be less than 33ohms.

7.5 is actually quite good... For comparison I get about 11 ohms here
with a heavy clay soil. Not sure where the 33 comes from though. With a
RCD protected TT system you can cope with worse impedances than that.

I did find out the other day that the power company has put down earths
on every 5th pole and I can have an earth terminal put on my neutral
cable for free, should I do this in future?
I cannot rember the terminology (TT and TMG I think).

The combined Protective Earth and Neutral option (a PEN conductor),
would give you a TN-C-S and PME supply. You currently have TT.


--
Cheers,

John.

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