RCBO Consumer Unit Help Required

[Mfuller]

Hi There,

I've recently moved into a new house that I am planning to rewire, then get professionally checked and tested. I am looking at replacing an old fuse box with a consume unit. Now, I am an amateur installer at best, and although I have had no problems installing a split load system, I am a tad confused when it comes to RCBO's.

The first problem is, I am not sure how they are wired into the consumer unit. Anyone have a RCBO CU configuration diagram ? or able to draw me a simple one ? Now, the buzzbar connection, the live and neutral are all fine, but there appears to be two extra connections via tails. See http://tinyurl.com/6cjw8 these ones at RS. Notice the black and white tails. What are their purpose ?

Anything else I should know about RCBO's ? I assume their current rating is the same as their MCB counterparts, e.g 6A for a lighting circuit etc ?

Any input apprecaited.

 

[mapj1]

For an RCBO, you need (like an RCD)
1) Live in (from the DIN rail Bus bar if you have one)
2) Neutral in (usually a flying black pigtail to the neutral bar)

and
3,4 live and neutral out to the final circuit.
these connections carry the full current of the MCB (30A or whatever)

Additionally some models include transient suppressors that should be connected to the earth. This 'functional earth' is either probably really cream coloured, but should go to the earth bar, along with the final circuit earth. This wire is often thinner as it only ever carries a small current, for a short time.

Hope that helps.
M.

 

[Mfuller]

That's perfect. I thought that might be the case, but wasn't sure.

Thankyou