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Well, I've looked at the system in a little more detail and I don't think it's a wire. There are three zones/transformers (600 w each). When I opened the third transformer only the #1 circuit had wire going to it - so the transformer isn't balanced. Would this cause the breaker in the transformer to trip? I know that a transformer is supposed to have equal load on both sides - circuit one and two. I'm assuming this used to work until recently, which is why we got the call from the customer. Before I can worry about any other problems on the system I've got to get it to turn on first.
Any suggestions?
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