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Donuts > Fried Eggs
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Where was the fuse located, on the primary or secondary of the transformer? Physically looking for a short is a very slow way to find it. Get an ohmmeter and check your de-energized conductors, and if that fails, get a low-voltage megger and try again.

It's possible the transformer has an internal fault, but it's also very likely you have a load failure.

Without knowing what happened when you say "spike" and "outage" it's kinda hard to speculate, and I also don't think that's gonna be much help troubleshooting this.
 
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