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This size service can be wired in a few combinations. Two parallel runs of 1250 MCM, three parallel runs of 600 MCM, four parallel runs of 350 MCM. Of the three choices the four runs of 350 MCM wires would be the easiest to handle if there are any bends in the service entrance conduit.
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FranA ground fault breaker does not operate from a ground wire. The ground fault breaker operates from current Transformers that monitor the current flowing through the breaker. If the current becomes sufficiently high (depending on what the breakers trip point is set at) the CT's current will trip the breaker open. A CT's current output is from 0 to 5 amps.
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