Discuss Planning garage sub-main project in the UK Electrical Forum area at ElectriciansForums.net

Ok so lots to think about haha.

Realistically I'm leaning towards fitting a new board at the house with RCBOs. Then to supply the garage DB, a 40A MCB. Am I right in thinking I'd need RCD protection for this sole MCB?
No not as long as the criteria is met for disconnection /cable sizing /bonding etc

You need to know the type of earthing you have and if the garage door is actually extraneous or there is a likelihood of having anything extraneous that may require bonding.
 
No not as long as the criteria is met for disconnection /cable sizing /bonding etc

You need to know the type of earthing you have and if the garage door is actually extraneous or there is a likelihood of having anything extraneous that may require bonding.
I think I'll get some pics later with the board cover off for you all to have a look at to build the picture further.

I can't think that there is anything that will need bonding in the garage tbh, unless you count the metal board itself?
 
So far, all the advice offered has been on the technical side of things.
Has anyone pointed out that a new circuit, and/or a new consumer unit has to notified to local authority building control before work commences? (Or that the work be carried out by a registered competent installer.)
 
The right hand side of your board with the lighting MCBs isn't RCD protected and the blank will be a spare way- so subject to a decent Ze you could simply fit an additional matching MCB for the new SWA, but it will have to be glanded properly, possibly into a small metal enclosure to ensure the armour is earthed. EDIT= Ah I've just seen your post stating T&E for the first part of the run, so the SWA can be glanded into a weatherproof enclosure with an earthing nut and lead to the CPCs.
If you need this much guidance I'm not sure you should be taking the work on
 
Ok so lots to think about haha.

Realistically I'm leaning towards fitting a new board at the house with RCBOs. Then to supply the garage DB, a 40A MCB. Am I right in thinking I'd need RCD protection for this sole MCB?
If you’re using twin and earth depending on your route maybe, then no rcd in garage. If swa straight to board no rcd protection in house just in garage board. In all honesty this is really basic stuff that you should know.
 

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