Rebalancing between two CUs

[David Costelloe]

I have two 1991 MK consumer units, each with 12 used MCB slots. It is a big house, and when we bought it, there were three fuse boards, one for each floor.

One of the MK's has loading on it for a cooker (45A MCB, 6mm T&E), an immersion heater (32A MCB, 2.5mm T&E), heat pump (45A MCB, 6mm T&E) and lighting/socket ring mains (6A/32A). The other just has lighting and socket ring mains.

Intuitively I would like a better balance between the two units. Is there any benefit to (say) moving the immersion and/or heat pump on to the less loaded CU.

All CU and circuits appear to operate well.

Final question, can I free up a CU MCB position by using one MCB to serve more than one ring main - ie is that compliant/unwise. The upstairs sockets seldom get used - may be a fan heater occasionally.

 

[ericmark]

In the main domestic supply is 60, 80, or 100 amp, and a consumer unit is rated 100 amp, when two are fitted from same domestic supply it really does not matter how the load is split, with a commercial split phase or three phase yes, but for most domestic does not matter.

 

[EFLImpudence]

can I free up a CU MCB position by using one MCB to serve more than one ring main - ie is that compliant/unwise. The upstairs sockets seldom get used - may be a fan heater occasionally.

Yes, that is allowed.