rcd

[mcm]

if a outbuilding is feed from the rcd side of a board in the house will this cover all wiring in the outbuilding, so alterations needed to the outbuilding board such as rcbo or rcd.

 

[Guest123]

Yes, the RCD at the house CU will also provide additional protection to the garage circuits so no need to install any additional RCD's / RCBO's. Assuming it's a 30mA one of course.

Only problem with this type of set up is that any fault in the garage will also knock out some or all (depending on set up) of the lighting & power in the house.

 

[telectrix]

as lenny says. better to come off non-RCD MCB in house anfit RCD or RCBOs in outbuilding. if lighting in outbuilding is surface, no RCD required on that circuit.

 

[MFHEng]

Hold on folks. First consider these questions:

What type of earthing arrangement exists TNCS, TT or PME

How far is the outbuilding from the house? - Does it share the same concrete base as the house? is it across a yard or field ?

Exporting TNCS earths are dangerous and should be TT configured at point of use, in this case this may be the outbuilding.

 

[Guest123]

Hold on folks. First consider these questions:

What type of earthing arrangement exists TNCS, TT or PME....Are they not one and the same....

How far is the outbuilding from the house? - Does it share the same concrete base as the house? is it across a yard or field ?

Exporting TNCS earths are dangerous and should be TT configured at point of use, in this case this may be the outbuilding.

........

 

[Sintra]

Hold on folks. First consider these questions:

What type of earthing arrangement exists TNCS, TT or PME

How far is the outbuilding from the house? - Does it share the same concrete base as the house? is it across a yard or field ?

Exporting TNCS earths are dangerous and should be TT configured at point of use, in this case this may be the outbuilding. Not always.

......

 

[MFHEng]

........

My mistake tncs,tt or tns

 

[MFHEng]

......

dependant on distance from the house in this case, which you still don't know.

If your comfortable running a large run from a tncs supply to an outbuilding and exporting the earth instead of utilising a tt system at the end of the circuit, thats your perogative and risk assessment


Which ever way you dress it up advice has been given with out first confirming the type of earthing arrangement and after that what exactly the building is and how far from the initial installation it is.

 

[Sintra]

dependant on distance from the house in this case, which you still don't know.

If your comfortable running a large run from a tncs supply to an outbuilding and exporting the earth instead of utilising a tt system at the end of the circuit, thats your perogative and risk assessment


Which ever way you dress it up advice has been given with out first confirming the type of earthing arrangement and after that what exactly the building is and how far from the initial installation it is.

Do you know the full set up of the installation?

You yourself were giving advice without knowing the details of the installation.

It is all purely speculative at the moment as none of us know the full details of either the supply, the type of outbuilding, external services entering the outbuilding so i don't think any concrete advice can be given.

 

[Guest123]

dependant on distance from the house in this case, which you still don't know.

If your comfortable running a large run from a tncs supply to an outbuilding and exporting the earth instead of utilising a tt system at the end of the circuit, thats your perogative and risk assessment


Which ever way you dress it up advice has been given with out first confirming the type of earthing arrangement and after that what exactly the building is and how far from the initial installation it is.

Hang on a minute.......all the OP asked was would an RCD at a house CU cover sub-circuits in an outbuilding if the sub-main was fed from it. You're the one who elaborated beyond the initial question for whatever reason.