Hi
I’ve got a new build house (2006), which I’ve moved into recently. It has a 16th edition Wylex split load board, and currently the 2.5mm SWA supplying the garage is on a B16 MCB, on the RCD side of the board. At the garage end, there is a garage consumer unit, with an RCD, and B6 MCB for the lights, and B16 MCB for the sockets. Both RCDs are the same rating:30mA. The house has a PME earth, which has been exported to the garage. The distance from the house to the garage is about 30m.
Clearly this is a poor setup, and worryingly it seems to be original from when the house was built.
I’d like to do something about this, as there is no discrimination between the house and garage at all. I’m thinking:
1) Supply the garage from the non-RCD side of the board, however there are no spare ways so I’m thinking I can put the burglar alarm and doorbell onto the same B6 MCB (currently they are separate).
2) Upgrade the MCB at the house end to a B20, so there will be some discrimination.
So the new setup would be 2.5mm SWA supplied from non RCD side, on a B20 MCB. Garage end would stay the same.
I would like to upgrade the size of the SWA as well, but it runs under a communal parking space, and there is no route a new cable could run without digging up some of the communal parking space, so unfortunately it’s not viable in the foreseeable future.
How does my plan sound?
Thanks for any replies
I’ve got a new build house (2006), which I’ve moved into recently. It has a 16th edition Wylex split load board, and currently the 2.5mm SWA supplying the garage is on a B16 MCB, on the RCD side of the board. At the garage end, there is a garage consumer unit, with an RCD, and B6 MCB for the lights, and B16 MCB for the sockets. Both RCDs are the same rating:30mA. The house has a PME earth, which has been exported to the garage. The distance from the house to the garage is about 30m.
Clearly this is a poor setup, and worryingly it seems to be original from when the house was built.
I’d like to do something about this, as there is no discrimination between the house and garage at all. I’m thinking:
1) Supply the garage from the non-RCD side of the board, however there are no spare ways so I’m thinking I can put the burglar alarm and doorbell onto the same B6 MCB (currently they are separate).
2) Upgrade the MCB at the house end to a B20, so there will be some discrimination.
So the new setup would be 2.5mm SWA supplied from non RCD side, on a B20 MCB. Garage end would stay the same.
I would like to upgrade the size of the SWA as well, but it runs under a communal parking space, and there is no route a new cable could run without digging up some of the communal parking space, so unfortunately it’s not viable in the foreseeable future.
How does my plan sound?
Thanks for any replies