Ugh bread making machines. I've a failed loaf here that someone made nearly 30 years ago with one of them as a reminder never to use them. I'll post a picture when I get a few minutes. Like my old Fiat, "nothing but aggro". Baking sheet or a can and the oven - job done!
The only problems as I see it with bread makers is that A. They are not generally large enough loaves for a whole family. B. The loaves do not turn out of the tins cleanly or easily and this is largely down to the mixing paddles being trapped in the bottom of the loaf and also because the dough gets under the paddle and also creeps down the shaft and then the paddle becomes wedged and holds the loaf in the tin.
This element that pops the RCD, has now been plugged in to a variac and has been brought up to the maximum of the variac of 2A which it achieves at 165V (earth disconnected) and the leakage is such that even after 45 mins sitting at 165V and getting very toasty, I can measure a voltage of 87V between the metal work of the element and earth so its no wonder it trips the RCD, so it will be going down the dump when the lockdown is lifted 
I never seen a whole house RCD except when I watched the British sparkies on Utube. I assume they are available here and I don't know if the latest code requires them. What is required is GFI protection of all kitchen, bathroom, and garage outlets. That can be accomplished 2 ways. Method one is a combo breaker/GFI for the branch circuits requiring them. But these combo breakers are expensive. Cheaper method is a GFI outlet first on the branch circuit and all other outlets on that branch are protected.
Most kitchen appliances here that have a heater, like toasters, coffee makers, counter ovens, etc are 2 wire polarized with no ground. In your situation above I don't think the GFI would have tripped because the metal cabinet would be floating. But as soon as someone touched the cabinet and formed an alternate path the GFI would have tripped. That sucks and I don't understand why those appliances here aren't grounded. Microwave ovens are.
Here, in the QC part of Canada at least, new construction must use the combo breaker/GFCI on all circuits requiring them. Modifications/renovations/repairs can use the GFCI outlets in most cases. Anything involving a pool or spa must be upgraded to a combo breaker/GFCI if the electrical is worked on.
However, I hate both of those options and dread the thought of a whole house RCD.
I take a more expensive option by installing a GFCI on the first outlet of the branch as normal, then tap the unprotected side to run to the second outlet where I use another GFCI outlet. This is especially useful for branch circuits for things like the car block heaters. If a GFCI trips, then one car is cold, but the rest of the fleet may not be cold. In the normal arrangement, the whole fleet would be left cold. I would hate to see a whole house GFCI trip in winter with resultant frozen water pipes (out typical home heating is also electric).
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Topic: Test Equipment Anonymous (TEA) group therapy thread (Read 17689245 times)