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Topic Title: "Submain" to house
Topic Summary: Switch fuse requirements
Created On: 28 July 2016 03:52 PM
Status: Read Only
Linear : Threading : Single : Branch
 "Submain" to house   - Delta2 - 28 July 2016 03:52 PM  
 "Submain" to house   - christait - 28 July 2016 04:32 PM  
 "Submain" to house   - AJJewsbury - 28 July 2016 04:34 PM  
 "Submain" to house   - AJJewsbury - 28 July 2016 04:37 PM  
 "Submain" to house   - weirdbeard - 28 July 2016 06:02 PM  
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 28 July 2016 03:52 PM
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Posts: 23
Joined: 14 December 2015

So, have a property with external meter (approx 10m from house).
I have to get the cable into consumer unit, which is 30m from said meter. Supply fuse is 1361 80A. DNO is saying that they will not provide comment on protecting the submain (25mm armoured), which is fair enough.
I've read that a hundred amp fuse is good for 3m in the eyes of the DNO, but they stated the same figure for 80A. I'm just curious as to the reason- I'll most likely fit an 80A KMF after a couple of calcs, so it is protected from my end, but obviously can't guarantee "mine" will go first in the event of a short. Is the no comment just for liability reasons, or am I missing something? Although a long run, can anyone see a problem.
Any information welcome,

Kind regards.

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