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Extending supply from one CU to the next with internal connectors

Alan B

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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    The Hager one is a poor option, as if you turn off the first DB, the second is turned off as well.

    But if the first DB's switch is intended to be the "main switch" for the installation, that's exactly what you do want. It's then a lot clearer if the 2nd DB (especially if close to the first) had these blocks instead of switch disconnector - the whole combination acting like one large DB (or CU) (if easier to fit in the shape of the space available).

    Bus-bar wise, apart from the old MK CUs which are now consigned to history, I don't recall bus-bars having any thicker prongs for the incomer - so if 100A going out on one of these devices is likely to be an issue then the incomer is going to have much larger problems. Overall load shouldn't exceed 100A for domestics anyway.

    These blocks are just simple terminals - not fused at all. Most of the larger manufacturers produce them in some form or other. So no chance of fusing neutrals or lacking approval.

       - Andy.

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  • 0

    The Hager one is a poor option, as if you turn off the first DB, the second is turned off as well.

    But if the first DB's switch is intended to be the "main switch" for the installation, that's exactly what you do want. It's then a lot clearer if the 2nd DB (especially if close to the first) had these blocks instead of switch disconnector - the whole combination acting like one large DB (or CU) (if easier to fit in the shape of the space available).

    Bus-bar wise, apart from the old MK CUs which are now consigned to history, I don't recall bus-bars having any thicker prongs for the incomer - so if 100A going out on one of these devices is likely to be an issue then the incomer is going to have much larger problems. Overall load shouldn't exceed 100A for domestics anyway.

    These blocks are just simple terminals - not fused at all. Most of the larger manufacturers produce them in some form or other. So no chance of fusing neutrals or lacking approval.

       - Andy.

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