On 11/02/2019 11:15, wrote:
On 10/02/2019 20:30, ARW wrote:

You might have boobed itÂ* - twice, if I am not mistaken!


1. You are using 240V not 230V for your fault current. (Max Ze for a
50A C type is 0.37ohm and remember that is when the cables are at 40 deg)


2. Your resistance calculations should be 16mm earth and 16mm live
(unless you wish to chop out the 6mm cpc of the 16mm T&E and not
bother using it)

Either way you are over the 0.37 ohms allowed.

It might be better to swap the head end with some thing like this

https://www.tlc-direct.co.uk/Products/CGMSF100.html


Yes, it's always better when boobs appear as a pair ;-)

I'd done the quick check at 230 but old habits (my fingers initially
typed old hobbits) die hard so 240 reappeared when I did the proper check.
When I decided to add the 10mm2 cable the brain forgot about the
existing CPC. I can't think of an excuse for that :-(

As you spotted, there was a third boob in your calcs ... brings back
memories of a character from HHG2TTG ;-)

I am glad someone like the bit of humour I try to put into some of my posts.

The actual fused isolator I was looking for (should you go that route)
is the Scolmore DB750. But I am sure the one I linked to is the same thing.

Scolmore one here

https://www.rselectricalsupplies.co....ched-db750_813

There is a shroud showing on the first link that allows T&E to enter
properly.
--
Adam