100A DP isolator with double terminals?

I don't know, but have considered using a Wylex REC4 4-pole isolator, taking the supply into the middle 2 poles, and using pieces of busbar on the load terminals to make a double output.

Or use a small CU as the isolator, with MCBs for the submain and the EV charger. Modern CUs are pretty well shielded internally.

Owain

I am not sure if you could get the busbar to fit in the REC4 box - never tried it.

But a 4 way CU with two MCBs is a brilliant idea.

I had assumed that was the main point of the REC4: allows separate isolation of the main CU and a secondary CU, or a main CU and a grid tied solar inverter? What else do people use them for?

(or are both sides ganged together?)

I thought this thing was called a solar isolator, but searching for that comes up with the 32A rotary switches instead. Theo

yes it's normally used between a 3ph meter and consumer unit.

Could you use a four pole three phase isolator to do what you want? Rotary ones can be padlocked off for safe working.

It's very tight in there unfortunately and I'd have to link the poles into two pairs. It may be possible though.

I agree. Just wonder if you would code on an EICR a 63A MCB (the highest I've seen in single width) between an 80A/100A main fuse and a fully loaded CU?

Eaton do 100A and 125A type C single width MCBs but they specify they're only for use in their 250A distribution boards ... somewhat chunkier than a 4-way CU.

Not just a mater of what Eaton specify. They are wider than a domestic MCB (27 mm vs 18 mm) so I doubted if one would squeeze into a 2 Way CU even if you could bodger round the difference in height.

I do not see anything to code unless you are expecting the fully loaded CU to be taking well over 63A for a prolonged period.