Discuss Lewden 100a switch fuse burnt out in the UK Electrical Forum area at ElectriciansForums.net
send it back ask for a refund .
OP
Fair point but I’m thinking bigger picture - if these things are cooking off like this on a regular basis then the manufacturer needs to know before a house goes up.
OP
Is what split con?
what cinema type or tv or picture on the wall .
OP
The cable coming out of the terminal is PVC/PVC 25mm tails
a person that works in a circus like trapezes artist .
The terminals are a bit pathetic on these and the Twist Wiggle And Twist method and a large slotted screwdriver is essential to get these terminals tight. I have been to several where the terminals have been loose. IIRC the screw is made of a different metal to the terminal which is never a good idea, but I could be wrong.
OP
No, bone dry, inside a fairly modern, heated house
I wonder which started first, the contact erosion could have started after everything got hot from a loose cable connection and the switch contact moved position when the plastic melted/burned.
I have seen other problems with the metal Lewdon 100A switch fuses, went to look at a fault at a pub/restaurant that only had a single phase supply, a large distribution board was connected via the switch fuse. This was new and had been fitted 6 days earlier by another company as the old switch fuse burnt out. I was called to 'check the electrics' as the cutout fuse had blown. Looking in the new switch fuse the connections were all loose and one of the new 25mm tails was clearly heat damaged. I don't believe the terminals were left loose by the installer but had worked loose from the heavy thermal cycling. The brass terminals the installer fitted the tails to in the 4 100A blocks, including the 2 new ones he fitted to cut out the heat damage from the outgoing tails were all tight.
With the power on I measured 141A being drawn and the wiring and fuse soon started getting hot.
I have seen other problems with the metal Lewdon 100A switch fuses, went to look at a fault at a pub/restaurant that only had a single phase supply, a large distribution board was connected via the switch fuse. This was new and had been fitted 6 days earlier by another company as the old switch fuse burnt out. I was called to 'check the electrics' as the cutout fuse had blown. Looking in the new switch fuse the connections were all loose and one of the new 25mm tails was clearly heat damaged. I don't believe the terminals were left loose by the installer but had worked loose from the heavy thermal cycling. The brass terminals the installer fitted the tails to in the 4 100A blocks, including the 2 new ones he fitted to cut out the heat damage from the outgoing tails were all tight.
With the power on I measured 141A being drawn and the wiring and fuse soon started getting hot.
OP
No I didn’t, but that’s a good call. I’ll put the clamp meter on in max/min mode and see what it gets to. It was an all electric 4 bedroom house (underfloor heating throughout) on a cold frosty morning with the lady at home running appliances. Could be a big number.
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