Thought I would share a problem that has cropped up quite often this year.
I have fitted new consumer units ( probably too early) on domestic extentions with building work still ongoing. Towards the end of the job found that some of the MCBs , although switched on, were not passing any voltage.
Between my visits for 1st and 2nd fix the builder had been creating a load of brick and plaster dust ( you know what they're like !!) . Dust had penetrated the MCBs and coated the contacts, had to sling 'em. This has happened to the main switch too. I always thought the MCBs were sealed , obviously not. May be a good idea to stick a plastic bag over the CU till the dreaded builders have gone.
Deke
I have fitted new consumer units ( probably too early) on domestic extentions with building work still ongoing. Towards the end of the job found that some of the MCBs , although switched on, were not passing any voltage.
Between my visits for 1st and 2nd fix the builder had been creating a load of brick and plaster dust ( you know what they're like !!) . Dust had penetrated the MCBs and coated the contacts, had to sling 'em. This has happened to the main switch too. I always thought the MCBs were sealed , obviously not. May be a good idea to stick a plastic bag over the CU till the dreaded builders have gone.
Deke
:OX(
