I have a need to run 25m of 10mm armoured from house to shed. Is it necessary to get 3-core (LNE) or is it still alright to use 2-core for LN and use the armouring for the Earth, like it used to be?
Armoured cabling run
Aug 19, 2021
Last reply: 4 years ago
6 Replies
It is not clear from your post to whether yopu are exporting the earth or if you are implementing TT earthing.
It is also not clear what upstream device you are using at the start of the armouring, i.e. what rating MCB you are using.
The earth will come from the earth bar in the house and it'll be a 40A MCB.
The 2 core will be fine unless you have for some reason to bond any extraneous-conductive-parts in the shed eg incoming metal water pipes etc
Brilliant, cheers mate ;o)
I managed to find this oldie for you.
formatting link
All you need is table 1 and table 2. It's a bit out of date (16th edition).
Nothing has altered apart from lighting voltage drop at the head end.
25m of 10mm cable needs no calculation.
Once again, brilliant, thanks very much my friend.
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required