![]() I show much, much less shared ground current here. What this means is that the primary ground and secondary ground aren't the same. They converted the primary to a 4.8kv-to-ground system when they reconfigured this area a few years before we moved here, but all the transformers are the same. My new house is served by a dedicated transformer, served by a single phase 4.8kv primary that used to be part of an ISOLATED delta system. That house was fed from an autotransformer tapped off of one of three phases on a 13.2kv wye-derived primary. It wasn't a problem, but it was easily measured. ![]() ![]() If you have an autotransformer, your ground shares current with the utility's primary ground system. With isolated windings, your local low-voltage 120/240 system doesn't share current with the utility's ground. All you need for this is a "real" transformer with isolated primary and secondary windings, not the autotransformers the utilities typically use when only using one of three phases on a wye-derived primary circuit.
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