I'd be grateful for any help with distributing the loads between the
two RCCBs on my 7th edition consumer unit.
1 radial upstairs lighting
1 radial downtairs lighting
1 upstairs ring main
1 downstairs ring main
1 kitchen ring main
1 radial oven circuit
1 shower circuit 10kW
Thanks for that John. However I don't think I can put the oven on the
kitchen ring as all the wire sizing guides I have seen require more
than 2.5mm T&EI
Also I'm not sure having the shower and the upstairs lighting on the
same RCCB is wise as if the lighting goes it leaves you in the shower
in the dark.
I'd do the same apart from the oven. I would put it with the downstairs ring
and upstairs lights.Although is probably does not matter.
I would put the shower on a different RCD to the boiler (whatever circuit
that is connected to).
On Wed, 24 Aug 2011 01:15:39 -0700 (PDT), clangers firstname.lastname@example.org
I am not an electrician but have just had a new consumer unit
installed by an electrician.
The way we did it was to have an individual RCBO for every circuit.
That means a trip on one circuit will only affect that circuit.
Crabtree. The price covered parts and labour. AIUI you would require
eight RCBOs so yours could be slightly cheaper.
Once the electrician got over his initial surprise (I nearly said
shock!) he agreed it was the 'way to go'. I just like the idea that
if the washing machine goes faulty it won't cause the computer to
On Aug 25, 8:43 am, clangers email@example.com wrote:
We were thinking about RCBO(s) to protect the fridge and freezer from
defrosting if a trip happened while we were away.
But the cost of the RCBO(s) was more than the value of food in the
fridge, and comparable to the value of food in the (upright) freezer.
Considering it had never been a problem before, this seemed rather an
expensive "insurance policy" for such a low risk and low value event.
To cover the potential lack of light when a light blows, an MCB and/or
RCD trips, or there's a power cut, or I intentionally switch off the
circuit(s), I added emergency lights in the hall.
There is the inbetween option. RCBOs for a couple of circuits and the two
RCDs for the rest of the circuits. Probably adds £50 to the installation. I
use such setups when there are dedicated outdoor circuits.
Yup, I was about to suggest the middle ground option... There are a
bunch of circuits that are highly unlikely to present trip hazards, and
others that are far moire likely. The unlikely ones can be distributed
about the pair of RCDs on the nominal "17th edition" (i.e. cheap 'n'
basic) CU, and then any likely problem circuits given RCBOs.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.