I am not really liking this idea, it depends on too many assumptions about current handling of the (small) busbars in CUs. Why don't you like Henly blocks, or are you worried to have more than the minimum switchgear? This looks like a double fuse box. You may not fuse a neutral connection, it is dangerous. I doubt that this is type tested inside a CU either.

I am not really liking this idea, it depends on too many assumptions about current handling of the (small) busbars in CUs. Why don't you like Henly blocks, or are you worried to have more than the minimum switchgear? This looks like a double fuse box. You may not fuse a neutral connection, it is dangerous. I doubt that this is type tested inside a CU either.

I did one recently, I wasnt at all happy in doing it, as it was just messy.

This was a Hager 3 phase +N board, they actually sell a kit for it, at the top of the DB busbar cover, there is a plastic cover, around 50mm square, this comes off, and 3 bolt on connectors are put on, the 3 legs+N then go through to the adjacent DB. Of course, 4x 25mm tails take up a lot of room, and are not particularly easy to bend, so it looks a mess.

I also brought up that Henly blocks would be a far easier solution, and being as there was 100mm ducting under the DB's, it would be neater too, but I was over-ruled.

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

Alan, could we be told the part number please?

I find this bizarre. It implies that there may be times when the first half of the installation is drawing no load and the second half is drawing the whole 100A.

My own 40 y.o. DBs are rated at 80 A. The first breaker is rated at 60 A: the cables look rather like consumer's tails and pass through a short length of 32 mm galvanized conduit to the second DB, which has its own main switch. I assume that this arrangement was used because the manufacturers did not make a sufficiently long DB for all of the circuits.

In any event, that sort of dummy main switch could have been used had one existed because there does have to be some means of attaching the busbar.

I do wonder whether this device goes against the spirit as opposed to the latter of 314.

Link below, now I've seen the price, I know it would have been better to get some service connector blocks with 2 sets of tails.

Hager tap off kit.