On the first one - did you happen to see any capacitors connected directly to the transformer?
**broken link removed**
I've seen some old-style UPS (and some monster industrial ones) for sale that were described as "ferroresonant", but the boat-anchor aspect/forklift requirement always convinced me to not to take a closer look.
I looked up the UL file number (E154515) on the ul site.
OBJY2.E154515 - Systems, Electrical Insulation - Component
It didnt give much detail but it does indicate they are isolation transformers.
I also found this: Three-phase electric power - Wikipedia, the free encyclopedia the wire colors seem to match.
I am in the US and neither of those wiring colors seem to match, unfortunately. (Actually, I'm glad they arent three-phase as I wouldnt have much use for it...)
@hijames: The supply had already been gutted before I got there, the 3 transformers were just mounted in the box and there was nothing left but a broken fan inside (the battery compartment was like 2 feet long by 6" by 1 foot high... would have liked those!)
I really suspect they are mains transformers, but I do not know how to make sure. I doubt I would fry them if i plugged them into the wall though since they are so big. Would it be dangerous for me to do that? just plug them into 120V wall outlet, unloaded, and check voltages on all of the secondary wires?
Also, which wires are more likely to be the primary (wall) side? there are two very thick white and black wires one one side and four wires of a narrower gauge on the other side of various colors.
mneary said:It's not necessary to hook the transformer to 120VAC to find the ratios; if you use 12VAC it will be a lot less dangerous.
Example: if you grab a "12VAC" winding and attach it to 120VAC, then you grab the 120V winding to measure it, you'll find 1200V. oops!
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