There is an fault in the mains supply to the electric heaters in the community hall for which I am responsible. The heaters are fed from an off-peak meter via a time switch. This switch is not working. This morning an electrician diagnosed a possible fault with time switch which he replaced. However, the replacement is not working either (it's not a new switch but one he retained from a previous job.)
Several years ago something similar occurred but I could only remember vaguely that it concerned a fuse which is in the power line to the time switch. I went and had as look at the fuse myself. I was surprised to find that the cartridge fuse had been by-passed by a piece of fuse wire. No sign of either having blown - I didn't disconnect to check the cartridge independently. Then I noticed that moulded onto the fuse holder was a message saying "wire fuse should not be used". What could be the problem?? The system is 30 years old or more. The fuse may not have anything to do with the fault but there is something suspicious there. Any suggestions TIA Frank