On 08/06/2017 13:54, Robin wrote:
On 08/06/2017 12:57, Tim Watts wrote:
On 08/06/17 12:38, John Rumm wrote:

Chapter 54 Earthing arrangements and protective conductors
Regulation 542.1.201 has been modified and now requires an additional
earth electrode, supplementing any earthing facility provided by the
distributor.

Does that mean all TN-S and TN-C-S will require retro-fitting of an
earthing rod?

I saw comments on that in April on the earlier draft of changes on the
lines of "Bound to be a controversial subject!".

But I think TN-S is OK; it's about PME (TN-S) where broken neutrals are
- allegedly - increasing.

It says:

"542.1.201 The main earthing terminal shall be connected with Earth by
one of the methods described in Regulations 542.1.2.1 to 3 , as
appropriate to the type of system of which the installation is to form a
part and in compliance with Regulations 542.1.3.1 and 542.1.3.2 .

***Additionally, there shall be an earth electrode, supplementing any
earthing facility provided by the distributor, in accordance with one of
the requirements of Regulation 542.2.3, to prevent the appearance of a
dangerous touch voltage in the event of the loss of the main connection
to***"

(My emphasis)

Which suggests it applies all earthing types - even TT!



--
Cheers,

John.

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