Testing after a consumer unit change

[TJC1]

Had to change 40 consumer units the other day in a hostel/hotel/b&b and it come to the testing stage


I spoke to the NICEIC who said you need to test circuits for " safety only ". He said doing a global IR test (testing each individual circuit if less than 1M), and earth fault loop, RCD and end to end to any ring mains. He said not to bother with R1+R2 or R2 test as polarity would be verify due to the Zs test.

How much depth do you do?

 

[Tony Reidy]

Had to change 40 consumer units the other day in a hostel/hotel/b&b and it come to the testing stage


I spoke to the NICEIC who said you need to test circuits for " safety only ". He said doing a global IR test (testing each individual circuit if less than 1M), and earth fault loop, RCD and end to end to any ring mains. He said not to bother with R1+R2 or R2 test as polarity would be verify due to the Zs test.

How much depth do you do?

40 in a day wow, I'd fit one and test it then go for a pint to celebrate a successful day

 

[Dustydazzler]

I’ve got it...

They have changed a 40 ‘circuit’ consumers unit the other day

And are now possibly contemplating which tests might need doing and not doing

 

[rolyberkin]

Who cares, 40 consumer units, £30 a circuit…..............!

 

[Dustydazzler]

Who cares, 40 consumer units, £30 a circuit…..............!

Too cheap

 

[Rpa07]

OP hasn’t been back since post #6 - they’ll have a bit of reading to catch up on and some explaining to do!

 

[richy3333]

OP hasn’t been back since post #6 - they’ll have a bit of reading to catch up on and some explaining to do!

Probably busy doing another 40 boards

 

[Gavin John Hyde]

it also comes down to size of the installation, number of circuits etc..
in terms of domestic and not a commercial 3 phase then
As already said by others for me it would be as a minimum
Ring - end to ends
Zs for each circuit as it confirms the polarity, If time permits then R2 with a wander lead or I might link busbar to earth bar in the cu with mcbs all open for a R1/R2 at random points on circuits, if anything pops up then then give that circuit some more attention.
IR - I would as a minimum do LN joined>E if there is lots of neons and fixed lights etc. as It can be a slow process to disconnect it all.
RCD/RCBO trip times on all devices
Then usual Ze, PFC, PSC, check bonding etc..