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Re: Multiple neutrals under same lug
if the grounded conductors of two branch circuits were terminated at a single connection point and it was necessary to isolate one branch circuit for the purposes of troubleshooting, the fact that the circuit not being tested remains energized can create an unsafe working condition for service personnel disconnecting the grounded conductor of the circuit that is being tested.
See 408.20 for the requirements on panelboard terminations for grounded and equipment grounding conductors-- some panelboard instructions allow a single termination point for more than one conductor, ONLY IF SPECIFIED. Otherwise, this is prohibited by the NEC.
Richard
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