Yeah, I was thinking the same. I believe they run a smaller gauge of wire vs. the standard 15A breaker run.

Let's hope your fuse box doesn't look like this...

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Quick FYI about a GFI

In a nut shell, a GFI simply monitors the delta of the current on hot line and the current on the neutral line. If everything is working correctly, the currents are the same (i.e. 1A on the hot coming in, 1A leaving on the neutral) and the GFI doesn't trip. If there's an imbalance (i.e. 1.005A coming in on the hot, and 1.000A leaving on the neutral), then that missing 5mA might be going thru you so it trips.

Don't know the actual trip point - I just tossed out some numbers for an example.

OK, I might as well look it up...

"A GFCI, by standards definition, must trip the circuit if a ground fault occurs with a maximum of 6mA of current loss to ground. GFCIs are typically considered personnel protection devices and the maximum 6mA trip level is set at a level to protect injury to people."

"Trip time is the amount of time it takes for the device to cut off the power to the line after sensing the appropriate amount of current loss to ground...are designed to trip in less than the UL/CSA/ANCE standard of 25mS. The shorter the trip time, the less chance of personal or equipment injury"

https://www.lindequipment.net/blogmain/gfci

Didn't realize that. Great, now I have to look that up too!