Rcd

[malcolmrudge]

I have a SWA cable running from my cu in the house to a cu unit in the garage. Does this cable have to be RCD protected?

 

[tony mc]

No it is not required so that when you connect the garage it will have its own RCD CU and you will have discrimination from the main CU.

 

[tvrelectrical]

Yup, no RCD required for distribution circuit of this type.

 

[T&Earth]

Depends what the supply type is if its TT then protection is required (I think)

T&E

 

[Guest123]

If the earthing system is TT then obviously depending on the Ra, the cable will need RCD protection of say 100mA S type to cover earth fault protection and also to avoid any nuisance tripping/discrimination issues.

If a TN system then no as the Ze 'should' be low enough for the fuse/MCB to offer the earth fault protection.