Would 10mm tails be acceptable?

[HappyHippyDad]

I will be fitting a henly block to split the meter tails. I'll be taking some tails 1-2m a new shower consumer unit (63A RCD and 45AMCB) with no spare ways to fit extra MCB's. I'm not sure what the cutout fuse size is.

I was planning on using 16mm tails but would 10mm tails be acceptable?

Regulation 433.3.1 (ii) states that over current protection need not be provided in this example.

 

[Deleted member 26818]

They used to be acceptable, but now, BS7671 doesn’t even list the CCC for 10mm2 in free air.

 

[DefyG]

[

 

[Deleted member 26818]

[

Multicore.

 

[DPG]

Where's that post gone?

 

[DefyG]

Dunno, what I was try to suggest was that as they are almost always installed as a line and a neutral 'touching' they are effectively a 2core cable (albeit no overall sheath) and therefore it wouldn't be unreasonable to apply table 4D2A ccc of 70A in free air.

 

[Bobster]

Really? ...... thought they were quite common for the example given by the OP.

I don't do domestic work. So no, not seen them before.

 

[Dave OCD]

Can anyone else remember using 6mm tails looping out of a Wylex board main switch to supply a new 1 way board for a shower? [Or other additional circuit]

 

[MFS Electrical]

If there's Daags present...

D’you like daags?

 

[MFS Electrical]

Can anyone else remember using 6mm tails looping out of a Wylex board main switch to supply a new 1 way board for a shower? [Or other additional circuit]

Never done it myself always thought it was a bit rough to be fair but it was quite a common occurrence round these parts.

 

[davesparks]

Can anyone else remember using 6mm tails looping out of a Wylex board main switch to supply a new 1 way board for a shower? [Or other additional circuit]

Am I right in thinking wylex boards had dual incoming terminals for exactly that purpose once upon a time?

I'm sure I've seen this on really old boards.

 

[freddo]

Some Wylex fuseboards had the 'extenso' terminals after the main switch, plenty of the Wylex 60a switchfuses certainly had dual incoming terminals.

 

[Dave OCD]

Am I right in thinking wylex boards had dual incoming terminals for exactly that purpose once upon a time?

I'm sure I've seen this on really old boards.

I've seen that Dave but rarely, more common to see the far left of the busbar [furthest away from the main switch] with terminals at the bottom the same as the outgoing 'ways' - you could loop from this and the neutral bar to an 'Extenso' unit as Freddo mentioned and this would just be an enclosure with a couple of fuse carriers isolated by the original main switch.