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=== At the Breaker Box / Panel ===The ground wire should be bonded at the main breaker panel. However they must NOT be bonded anywhere else in the system including sub panels. There should be a single continuous 6 gauge copper wire going from the panel to the lug on the outdoor grounding rod. Provide protection of the ground wire against mechanical damage anywhere it is exposed by using non-metallic conduit. Some panels have two separate connection points but on many panels both the earth ground and utility neutral connect to the neutral bus.