Discuss What size is this supply? in the UK Electrical Forum area at ElectriciansForums.net
A relative in West Cheshire sent me this pic. He is contemplating having an EV charger and other electrical appliances fitted. He asked me if he has a 60A or 100A supply. From this pic, it looks like a 100A supply with 60A fuse fitted for some reason. He wants it to be 100A. Any ideas?
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Sometimes that pesky little fuse fairy helps us out…What a pity we’re (generally) not allowed to pull the fuse, open up the carrier and have a look.
I know electricians are supermen among tradespeople, but x ray vision is beyond even me.
I believe his name is Pablo.Sometimes that pesky little fuse fairy helps us out…
I agree. The 25mm tails from the service head to the meter is a give away. If it was 60A from the start, it would be 16mm.We can only go on the same info as you, and so I would agree - a 100A carrier with 60A fuse.
I know DNOs in some areas were putting in 60A main fuses in 100A supplies. I assume to discourage excessive use as their system overall cannot cope. Like some here, I assume this is a 100A supply with a 60A fuse. So a 100A fuse would not harm anything.
If the DNO a number of years back did downgrade the fuse, then it would be matter of slotting a 100A fuse back in. Even if the DNO does not know. How naughty.
If the house was orginally 100A, then they downgraded it to 60A, then they have to upgrade at their expense?
I know DNOs in some areas were putting in 60A main fuses in 100A supplies. I assume to discourage excessive use as their system overall cannot cope. Like some here, I assume this is a 100A supply with a 60A fuse. So a 100A fuse would not harm anything.
If the DNO a number of years back did downgrade the fuse, then it would be matter of slotting a 100A fuse back in. Even if the DNO does not know. How naughty.
If the house was orginally 100A, then they downgraded it to 60A, then they have to upgrade at their expense?
Every 60A supply I have seen had 16mm cable from the fuse to meter. This may have been an exception though.No, it wasn't originally a 100A supply. It's just the maximum rating of the cut out is 100A. Just like the max rating of an isolator for example.
He said he thinks that 60A label was put on when he went over to a smart meter. If you look at the seal it looks newish, which may indicate the fuse was downrate, being initially a 100A fuse.
Bs1361 and bs88 service fuses are 30, 40, 50, 60, 70, 80, 90 and 100AThought it would be a 63A, not 60A? 63 80 100
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