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Jason, Service Technician
Category: Electrical
Satisfied Customers: 4286
Experience:  Over 20 years of experience in all types of installations, troubleshooting, and repairs.
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Our 100a main fuse is getting extremely hot but the cables

Customer Question

Hi, our 100a main fuse is getting extremely hot but the cables leading up to out meter are relatively cold. Everything in the house is working but we do have a lot of equipment on all the time
Submitted: 2 years ago.
Category: Electrical
Expert:  Jason replied 2 years ago.
Hello. Welcome to Just Answer.
Expert:  Jason replied 2 years ago.
Ideally, we should take amp readings on your two mains.
Expert:  Jason replied 2 years ago.
However, if the two main wires aren't getting warm, this is most likely a main breaker that is going bad.
Expert:  Jason replied 2 years ago.
It could also be a loose connection, but that would usually cause the wire to overheat as well.
Expert:  Jason replied 2 years ago.
It's pretty dangerous to be working inside of a live electrical panel. So unless you are very comfortable doing so, I would call a local electrician to check this out.
Expert:  Jason replied 2 years ago.
It doesn't sound like something that presents an immediate fire danger, but it could fail at any time and leave you without power until it is replaced.
Customer: replied 2 years ago.
Thanks, ***** ***** cable is getting quite warm, the 100a fuse is extremely warm but the 2 tails going up to the meter are coldish. Where would the loose connection likely to be and how would you go about rectifying it.
Expert:  Jason replied 2 years ago.
I would follow the warm cable to both ends, and check the connections there.
Customer: replied 2 years ago.
Sorry the main cable is buried in the floor and warm but it's the fuse area that seems to be the main issue. Can you tell me how to tighten up the connection at the love side of the fuse
Customer: replied 2 years ago.
Live side
Expert:  Jason replied 2 years ago.
You are in the UK, correct?
Expert:  Jason replied 2 years ago.
If you can post a photo of the area that is getting warm, that would be helpful.
Expert:  Jason replied 2 years ago.
Here in the US, we can remove the meter to cut all power to a building. When the mains are loose, I would always remove the meter before attempting to tighten any connections in that area.
Customer: replied 2 years ago.
Yes I'm in the uk, I've tried to send a pic. It's just a basic domestic 100a fuse
Expert:  Jason replied 2 years ago.
Thank you for posting the photo. The black, square component, at the top center of the photo appears to be the meter. Here in the US (where the meter looks much different), we can pull the meter out to remove power from the structure. There will still be live wires coming from the utility, but we wouldn't try to tighten those without the utility coming to remove power further "upstream" from the meter box.
I don't want to tell you to do something that is unsafe. If you are able to remove the meter and drop power from cables that could be loose, please do so before attempting to tighten those connections. Otherwise, please call a qualified electrician to check for loose connections.