CU change: incomplete CPCs in lighting circuits

[harrymonkfish]

Hi all.

I've almost completed my first CU change for my assesment and would like some feedback on my choices.

First point is the cpcs in the lighting circuits x2 are incomplete. It is a PME supply.

I've change the board to an insulated, duel RCD, so every circuit is covered.
I have a single ring (32a) for the whole house on one side (all tests work out fine) along with a cooker circuit (32a), and a shower circuit (40a) to be added later, although the shower is installed but is not connected.

The two lighting circuits (10a) are on the second RCD.

Upgraded main bonding to 10mm for gas, water and included central heating pipework with water.
Upgraded main earth to 16mm

I used some 4mm green and yellow to connect the pipework for the taps to the bathroom sink and under the bath. I havn't gone any further than this as far as supplementary bonding in the bathroom is concerned.

All light fittings are of the insulated type for the whole property.

I'm a bit confused as to what to put down on the cert for R1+R2 and Zs for the lighting circuits.

There is also a an old cable that was connected to the old CU 15a. I couldn't find anything that this circuit powered so did not reinstate it. Turned out to be an old immersion heater cable. Thing is, the owner did some digging around with a voltage indicator and discovered a voltage along the cable. I tested today and it has a an intermittent votage of 2V. It is run in the ceiling with other cables that are in use?

Any help, advice, comments or suggestions greatly appreciated.

Many thanks
Harry

 

[Spudnik]

Thats where the quote came from.

 

[chocolate]

Thanks for posting the LINKS to specific guidance notes regarding changing consumer units when lighting circuits do not contain cpcs. Some bedtime reading.

As they state, they are guidance notes only. So it is the professional who must employ their promise for 'duty of care' to customers and property, and make that ultimate decision.