RCBO's replacing MCB's

[Bud1975]

Hi guys,

I am quite new to all this and I have a number of questions running through my head. One of them being.....

Do most RCBO's fit into the space occupied by an MCB to enable that circuit to be RCD protected as I have seen posts to suggest this might be possible? (Of course this would be a much cheaper option than fitting a seperate RCD unit or even a new consumer unit)

 

[GLENNSPARK]

If you have a scenario lets say a new kitchen ring and the existing dis board is a bs3036 (a common scenario) then what you can do is to use a garage board with rcd and 2 ways 1 for the cooker and the other for the ring/radial for the points. You would typically wire this sub board of one of the fuses in the existing board this will give you rcd protection on any new work you have carried out and thus comply with the current edition of BS7671.......

 

[malcolmsanford]

If you have to be careful Glen doing that mate as some of the older BS 3036 boards are limited to just 30amps, so you may be overloading it.

Yes Bud1975 you could just use an RCD and the overload would be covered by the FUSE/MCB.

 

[GLENNSPARK]

If you have to be careful Glen doing that mate as some of the older BS 3036 boards are limited to just 30amps, so you may be overloading it.

Yes Bud1975 you could just use an RCD and the overload would be covered by the FUSE/MCB.

My boss uses a henley but i dont know: no overcurrent protection on the tails see........you cant just rely on the bullit can you.........

 

[malcolmsanford]

Well you can if your not exceeding 3 metres. Have a look at reg 433.3.1 (i) for overload as this will then (ii) will direct you to reg 434.2.1 regarding fault protection.

 

[GLENNSPARK]

Well you can if your not exceeding 3 metres. Have a look at reg 433.3.1 (i) for overload as this will then (ii) will direct you to reg 434.2.1 regarding fault protection.

Yes....with a few restrictions such as fire and/or explosion. thanks Malcolm.