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If bldg b is a townhouse (5 units) and they have their own panels, wouldn't it have a problem with nec 230.2? The townhouse bldg b has its own meter center mounted in its own wall outside (800amps with 5 meters of 200amps). If that meter center is switched off, the wall mouted lights will remain on because they're branched in house panel that is located in panel A.