Combi Boiler

Ponty Massive · Aug 17, 2010

Afternoon all,

Just a confirmation question if i can. A mate as asked me to install a fused spur (in his kitchen) for a combi boiler he is having installed.

The CU is an old wylex, no RCD or MCB's, TNCS supply with what looks to be a 6mm earth supplying the board and 6mm bonding to gas and water. (The whole house is only on 3 ways - Sockets, lights and supply for old immersion heater)

If I was to run the cable from an existing socket in surface trunking, would this eliminate the need for an RCD? (OSG p22).

As this would be a modification to a circuit I understand I would also need to run new 10mm bonding to both services and run a new 16mm earth from the supply (which is in an outside cabinet along with the meter).

Thanks all!!

Plonker 3 · Aug 17, 2010

No as all skts now need to be RCD protected unless under supervision or label for a particular.

Also all the Bonding cables would need upgrading to the releavnt size.

Probably best to just put it on a plug top if all the alterations aren't possible.

lamb · Aug 17, 2010

An FCU fed in surface trunking does not require an RCD, unless it is in a bathroom or to supply equipment outdoors.

liam b · Aug 17, 2010

trunk from the socket and itll be fine

10mm and 16mm like you said

aslong as the ring tests ok jobs a gudden

keniff · Aug 17, 2010

i believe you will be ok as the regs say an exception is made for a specific labelled connection of a item of equipment just as the other guys say check your earth and test out!

Hawk81 · Aug 17, 2010

Dillb said:
No as all skts now need to be RCD protected unless under supervision or label for a particular.

Also all the Bonding cables would need upgrading to the releavnt size.

Probably best to just put it on a plug top if all the alterations aren't possible.

you are right about sockets but as the op is adding in a fused spur and its all surface then he does not need an rcd