CU replacement on off peak side

sparc · May 17, 2012

I'm quoting for job replacing three re-wireable fuse boards in rambling 4 bed house. One of boards has 4 x 20A BS3036 fuse each serving a storage heater and comes of the off-peak side of meter.

The customer wants the cupboard to be tidied up as much as possible.

The two boards on normal tariff can be replaced by a single Hager, but I'm wondering about options for the storage heater distribution.

One could be to put an 80A 30mA RCD between Henley block and existing 4 X BS3036 board, another to replace that board with a small MK garage unit - 80A RCD and 4 20A breakers.

Are there any neater solutions out there?

timo1 · May 17, 2012

I did something similar but I used a small 4 way board on a main switch and 4 rcbos. looked pretty neat though.

Rockingit · May 17, 2012

Hager make a double tiered board which you can adapt to suit you. What you could do is have one rail as your normal split board, and bring the e7 tails up to the other rail and do it again. Not cheap - I got one for a job a few months back and it was about a hundred quid - but very very good to work in and really neat as everything can end up in one box.

They also do multi-tariff boxes designed for the purpose which I've not looked at so can't comment.

sparc · May 21, 2012

Many thanks for the inputs. I've looked at the dual tariff boxes and decided to give them a miss. The customer has chosen to go with a new small consumer unit to replace the BS3036 for storage heaters, so I'm probably going to do with Legrand for both bigger and small CUs - they do a 6-way consumer unit with an 80A 30mA main switch, which will be perfect. Their 16-way dual RCD is also high integrity - only limited to 2 unprotected ways, but it should give enough flexibility.