Voltage Selection
We made a monitoring device that was powered at either 24V DC or 110V AC via different terminals.
It was not unusual to find both supplies wired up and live, at least until the unit was found to be 'not working'. Repair was a simple fuse replacement, but involved dismantling the monitor (and supply correction, drawing updates etc.). It was a silly arrangement, updated devices were 24V DC only.
Biting the hand that feeds IT
