Fitzy

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Arms
Tomorrow I’m changing my consumer unit in preparation for my NICEIC assessment on 13th November and have a few queries.

Firstly, current cu only has 4 circuits sockets up & down and lights up & down, so hopefully a pretty straight forward swap.

I can unplug 95% of loads on both ring finals, except for the oven and the boiler, both of which have LCD/LED displays. So when it comes to doing the insulation resistance test, would the 500v dc test damage either of these appliances LCD’s or LED’s? The oven and hob ignitor are connected behind the kitchen units.

Also, upstairs we have GU10 spot lights on the landing and bathroom, can’t remove them to do the R1+R2 test as they’re very tight and as we only rent, I can’t cause any damage to the ceiling. So would it be ok to just do the R1+R2 on the final light fitting in the rear bedroom or should I try to find the spots wiring in the loft?
 
I can unplug 95% of loads on both ring finals, except for the oven and the boiler, both of which have LCD/LED displays. So when it comes to doing the insulation resistance test, would the 500v dc test damage either of these appliances LCD’s or LED’s? The oven and hob ignitor are connected behind the kitchen units.

If they have isolators, turn them off and run the full suite of tests (L-N, L-E and N-E). If they don't have isolators join L+N at the board and test L+N to E. This is acceptable when making alterations to existing installations. You just put a LIM in the live-live column for IR.

Also, upstairs we have GU10 spot lights on the landing and bathroom, can’t remove them to do the R1+R2 test as they’re very tight and as we only rent, I can’t cause any damage to the ceiling. So would it be ok to just do the R1+R2 on the final light fitting in the rear bedroom or should I try to find the spots wiring in the loft?

Can you access the loft? If so, do the tests from above. It's nice to verify CPC continuity through out, so at the very minimum I would check R2 at each location using a wander lead.
 
If they have isolators, turn them off and run the full suite of tests (L-N, L-E and N-E). If they don't have isolators join L+N at the board and test L+N to E. This is acceptable when making alterations to existing installations. You just put a LIM in the live-live column for IR.

Can you access the loft? If so, do the tests from above. It's nice to verify CPC continuity through out, so at the very minimum I would check R2 at each location using a wander lead.

Unfortunately neither appliance has an isolator, but thanks for the L+N to E tip.

I have access to the loft, but not boarded out, so will have to be extra careful up there.
 
if you only have 4 circuits, i'd fit a BG 6 way RCBO board with 4 RCBOs .get gear from TLC the BG compact RCBOs are ony £15.60 inc. vat each.

I’ve already bought an MK 12 module board, which leaves 4 modules for future additions.
 
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Thread starter

Fitzy

Arms
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Redhill
If you're a qualified, trainee, or retired electrician - Which country is it that your work will be / is / was aimed at?
United Kingdom
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Practising Electrician (Qualified - Domestic or Commercial etc)
Business Name
DF Electrical Services

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Replacing Consumer Unit
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UK Electrical Forum
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Fitzy,
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