Extending supply from one CU to the next with internal connectors

Just been browsing parts and seen these

https://mastertrade.co.uk/fusebox-it1002u-100a-2p-connector.html

Wondering if in some cases they are a more elegant way of effectively splitting the supply to two consumer units.

Run supply into first unit and then use one of these to connect to the second unit. Struggling to get my head around how I would connect inside the consumer unit and maintain a supply capable of carrying ideally 100 amps.

Presumably the bus bar is ok if the connector is next to the incoming device, second board would use another one of these instead of a switch.

Then presumably use a short internal neutral cable from hager or similar from the neutral bar.

Wondering why I haven't seen others doing something like this. I am mainly looking at EV installs.

I assume these are aimed at when CU's are stacked and enabling effectively internal interconnection, where as for me I would probably have the boards next to each other, maybe with a gap. 

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  • Hi All

    Thanks for the input so far.

    The part number is IT1002U. https://fusebox.co.uk/products/it1002u/ 

    So the challenge i am trying to solve is finding an elegant way to split the tails when the consumer unit is in a downstairs toilet or in the wall way. Quite often in houses that are less then 5 years old, some less than a year old. Still with split load boards, that I can't connect an EV charger to because they can't share n RCD with other circuits. Some are actually pre wired for EV's.

    So frustrating that electricians are still allowed to install split load boards, in my opinion all new domestic boards should be RCBO or as an absolute minimum have some high integrity ways.

    Informing the customer that their almost brand new consumer unit isn't suitable isn't an easy conversation. Then telling them they need an additional consumer unit, plus a load of trunking to hide cables and Henley blocks isn't great, especially if the existing CU is semi recessed with the tails running in the cavity; i know tails shouldn't be in the cavity but there is one company that wires 90% of the new builds within 20 miles of me and it's their standard practice.

    Also it can be challenging to keep cable lengths short enough for a single SPD to protect both boards. I can get around this with an isolator with built in spd, but this can be expensive

    My thought was that theses connectors would allow me to avoid Henley blocks and just run the cables between the CU;s.

    I agree I hadn't thought about the prongs on the bus bar being thinner. Maybe I should put the additional CU below the existing one and use a CU expansion kit.

  • The part number is IT1002U. https://fusebox.co.uk/products/it1002u/ 

    Yes, got that - too many Alans!

    I shall have a look at alanblaby's Hager boards in slow time.

    One of the problems, I think, is that modern houses are so small. I went to a promotional event for a local housing estate 3? years ago (pre-covid) and they allow 25 m² per person!

    My bugbear is not so much the CU up against the ceiling (whether or not above a WC) but at the regulation wheelchair user's height in a downstairs cloakroom cupboard/wardrobe/WHY which is fine until it gets snuggled up under the family's coats.

    I agree with "high integrity" or all RCBO boards. I think that alarms (smoke or burglar, etc.) should be on a separate RCBO. As a consumer, the cost of all RCBO does not bother me, but we do have the cost-of-living-crisis!

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  • The part number is IT1002U. https://fusebox.co.uk/products/it1002u/ 

    Yes, got that - too many Alans!

    I shall have a look at alanblaby's Hager boards in slow time.

    One of the problems, I think, is that modern houses are so small. I went to a promotional event for a local housing estate 3? years ago (pre-covid) and they allow 25 m² per person!

    My bugbear is not so much the CU up against the ceiling (whether or not above a WC) but at the regulation wheelchair user's height in a downstairs cloakroom cupboard/wardrobe/WHY which is fine until it gets snuggled up under the family's coats.

    I agree with "high integrity" or all RCBO boards. I think that alarms (smoke or burglar, etc.) should be on a separate RCBO. As a consumer, the cost of all RCBO does not bother me, but we do have the cost-of-living-crisis!

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