Just a pointer from an observation I have made. I was using a length of standard heating wire, the same that's used in those foil backed heating pads, in a chemistry synthesis to maintain temperature in a bowl of water. The wire was simply coiled up and placed in the water and turned on. It worked very well until it burned out. I discovered that a short occured in 2 places where the coils were touching each other.
The moral of the story is, never let any of your heating wires touch each other, I have heard stories of these heating pads catching fire and this is probably how it happens. Go now to your setups and check this, even in the heating pads themselves, on numerous occasions I have found the wires in the foil pads themselves touching each other.
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