code query

telectrix · Feb 12, 2017

just done a EICR. good installation, approx. 10 years old. 16th ed.split board, lighting circuits non-RCD, on TT earthing. my query is this:
the Zs readings are high, due to the high Ze, insofar as , e.g. lighting circuits on 6A MCB each have a Zs higher than the max. permissible . should I C2 the high Zs readings, or give it a "pass" with a C3? your thoughts, gentlemen (and ladies).

telectrix · Feb 13, 2017

Midwest said:
Would those RCBO's need to be DP or switched N. I only ask (and not trying to be clever) because of this debate some while ago;

TT systems and RCBO's - http://www.electriciansforums.co.uk/threads/tt-systems-and-rcbos.110727/

preferably d/p or s/p ans sw N. reason being that the N is dissed as well as the L in the case of a fault..

Midwest · Feb 13, 2017

telectrix said:
preferably d/p or s/p ans sw N. reason being that the N is dissed as well as the L in the case of a fault..

Thing is, those you describe are as rare as rocking horse pooh, other than Special Boat Service ones

eek

.

Risteard · Feb 13, 2017

Midwest said:
Would those RCBO's need to be DP or switched N.

No, there is no requirement. The main switch will provide all pole isolation to the installation. (That isn't to say that it mightn't be desirable - just that it's not required.)