Connecting consumer units

[epager]

Hi All
I need to locate a new consumer unit approx 10 to 12 metres away from the mains supply. The existing old unit is less than 50cm from the supply.
My initial thought is to replace the existing old unit with a small unit housing just a 100A double pole isolator switch and run tails from this unit to the satalite unit, which will then act as the main distribution point.

However, everything I've ever known about tails is that they do not [usually] exceed 3 metres.

What is the generally accepted method of achieving my objective on this project (within the confines of current rules)?

Any suggestions gratefully received.

Thanks
Mike

 

[epager]

Picking up on a comment in a previous thread on this forum, is there any point running 25mm to the new CU if the incoming mains if fused at 80A ?
16mm would seem perfectly adequate.

(cable will be surface and under-floor)

 

[robsparx]

SWA every time. Really can't see any advantage in using tails

 

[SirKit Breaker]

Hi Guys, thanks for your replies.

I have asked this same question elsewhere and there appears to be favour for the use of an isolator switch with time delayed RCD. But here the suggestion is that this is not sufficient and should instead require a switchfuse. With such a device, isn't that just doubling up on the existing mains fuse and therefore technically unnecessary?

The idea of a switch fuse is that it will be fused at a lower rating than the supply fuse, therefore this will blow first and so protect the suppliers equipment.

Cheers.......Howard

 

[epager]

SWA every time. Really can't see any advantage in using tails

Cost would seem one advantage.