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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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    Would make a lot more sense if they employed DP (L+N) bus bars.In a conventional setup it could only go on the far end of the bus-bar from the main switch and as you have have an additional tail to the N bar - which probably isn't idea. It could go next to the main switch and then use short tails for both L & N to supply the terminal block from the load side of the main switch (if the main switch terminals were capable of taking those in addition to the outgoing busbar) or even a short section or DP bus-bar (I've occasionally used DP forked bus-bar which sits under the terminal screw heads, leaving the cage clamp terminals free for extra conductors, but that only works with some styles of terminals).

    But yes, ideal for replacing the "main" switch on the 2nd unit to keep identifying the installation's main switch obvious.

       - Andy.

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  • 0

    Would make a lot more sense if they employed DP (L+N) bus bars.In a conventional setup it could only go on the far end of the bus-bar from the main switch and as you have have an additional tail to the N bar - which probably isn't idea. It could go next to the main switch and then use short tails for both L & N to supply the terminal block from the load side of the main switch (if the main switch terminals were capable of taking those in addition to the outgoing busbar) or even a short section or DP bus-bar (I've occasionally used DP forked bus-bar which sits under the terminal screw heads, leaving the cage clamp terminals free for extra conductors, but that only works with some styles of terminals).

    But yes, ideal for replacing the "main" switch on the 2nd unit to keep identifying the installation's main switch obvious.

       - Andy.

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