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What are your thoughts regarding wiring in a "typical" electric service panel.  Specifically the use of the Ground Buss Bar and the Neutral Buss Bar?  I have seen many instances where the incoming Neutral wire is connected to the same buss bar as the grounding wire.  I have heard that this does not make any difference; while some electricians say that this is not correct, though not an electrical hazzard.  What are your thoughts?