DNO Concentric cable current carrying capacity Discussion ThreadDNO Concentric cable current carrying capacity Electrical Advice
Had UKPN come out to a property recently to upgrade the main fuse from 60A to 100A but when they arrived they said that the supply cable which he confirmed is a 25sq.mm. CNE aluminium concentric cable (1-phase, burried) for the PME supply is only able to take a 80A fuse. They will have to dig in a new supply cable (presumeably 35sq.mm) to complete the upgrade to 100A. The supply isn't looped and the meter/consumer tails have already been upgraded to 25sq.mm. so no problems there.
It seems strange to me that they say that this cable isn't able to take 100A? Looking at datasheet from Cleveland it looks like worst case is CCC of 105A.
Was the guy correct to say that 80A fuse is the max on that cable? Obviously it's at their expense to dig in the new cable but it would be much better to avoid the hassle of it all if it's not needed. I have a link to a UKPN document EDS 02-0033 which documents the current carrying capacity of some larger waveform cables from 95-300sqmm but can't find anything for domestic supply 25sqmm cable.
DNO Concentric cable current carrying capacity for the original thread on Electricians Forums
Had UKPN come out to a property recently to upgrade the main fuse from 60A to 100A but when they arrived they said that the supply cable which he confirmed is a 25sq.mm. CNE aluminium concentric cable (1-phase, burried) for the PME supply is only able to take a 80A fuse. They will have to dig in a new supply cable (presumeably 35sq.mm) to complete the upgrade to 100A. The supply isn't looped and the meter/consumer tails have already been upgraded to 25sq.mm. so no problems there.
It seems strange to me that they say that this cable isn't able to take 100A? Looking at datasheet from Cleveland it looks like worst case is CCC of 105A.
Was the guy correct to say that 80A fuse is the max on that cable? Obviously it's at their expense to dig in the new cable but it would be much better to avoid the hassle of it all if it's not needed. I have a link to a UKPN document EDS 02-0033 which documents the current carrying capacity of some larger waveform cables from 95-300sqmm but can't find anything for domestic supply 25sqmm cable.
DNO Concentric cable current carrying capacity for the original thread on Electricians Forums
