Supply to submain no rcd.

[Monkeyblaine]

I've been asked to do some minor alterations to an out house which is supplied from CU in main house. Now the new CU in outhouse has RCD protected circuits but the supply from main house is not RCD protected. The cable is a 20m run in hightuf clipped to outside wall clearly visible. Should I put it on RCD from origin on perhaps 100mA to prevent nuisance tripping?

 

[Guest55]

no that would be a complete waste of time.
no rcd req'd for clipped direct cable runs.
leave as is.
;-)

 

[Monkeyblaine]

Thank you.

 

[KAS1]

More to this than meets the eye I thinks, maybe he's looking for conformation that the type of supply cable to the outhouse is ok ie fit for purpose, maybe it should of been SWA as he seems concerned it may occur damage?

 

[Guest55]

i get the impression the original installer actually knew what he was doing , by not trying to rcd the circuit at 2 points.
;-)

 

[KAS1]

Point taken, but you know what this forum is like for inexperience