Why does the 60amp fuse of my heating unit keep failing. I have changed the fuse 4 times in the past 4 days.?
Probably faulty heating elements. You are going to have to call a heating co. if you don't know what you are doing. Sorry.
Why does the 60amp fuse of my heating unit keep failing. I have changed the fuse 4 times in the past 4 days.?
You may have a short circuit in the heating unit itself. Or check the rating on the unit. If it is rated at higher than 60 amperes it will draw too much and blow the fuse.
its over loading,something in the heat unit is causing it to overload and blow,make sure all the wiring is tight and not burned,check the fuse box for loose wires,do you have alum. wiring?if so i be willing to bet its loose wires
D2 has a good answer here. If it has just started happening the first place I would look is the tightness of the connections. If you have something loose it causes more draw on the circuit when it is in operation since the loose connection will heat up.
Do the fuse holders make good connection to the fuses? If the fuse is loose in the holder, the poor connection will generate heat and heat is what causes the element in a fuse to open.
How long will the heater run before the fuse blows?
If it will run for at least an hour of continuous use, you most likely dont have a short to ground but it may be possible that part of the heating element is shorted and drawing more current than it should.
If the fuse blows fairly quick, this indicates a serious overload which could either be a shorted element or a short to ground.
Ideally, you would use a clamp-on ammeter to measure the current draw (should not exceed 48 amps on a 60 amp circuit). If the current is OK, then I'm back to wondering if a poor connection at the fuse holder is causing the trouble. Aside from the spring clips that hold the fuse, the wire connections to the holder could be loose and causing heat.
After running for a while, the fuses would probably be warm to the touch but not hot.
