Hi guys,
I am living in a bungalow built in 1963 that has a 100 amp fused panel with copper wiring.
1 of my main 100 amp cartridge fuse blew last night and i woke up to a cold house (heatpump and oil furnace heating).
What could cause the main fuse to blow?
All i had on was the heat, a blower fan for my fireplace alarm clock and coffee maker set to turn on at 6:30.
My heat pump is old and has a tendency to need resetting on cold days to work properly. It was -12 celcius last night so it should not have been working anyways.
I tightened some neutral screws in the panel, the ground screws and tested all fuses.. none were blown.
I dont know where to look next. Could the clips that hold the cartridges be loose? I didnt see any evidence of arcing anywhere. Dont see any water infiltration anywhere.
I have an electrical background, took the construction electricity course (1350 hours) but havent started working yet as an apprentice.
I appreciate any and all feedback.
