200.6 D - Question

[Marcus Waddell]

Does "different systems" mean literally different systems (i.e. two different panel sources) or does it mean different circuits from the same system? OR two different voltages from the same system (120/240)??

Just trying to make sure I don't do something not safe or something the inspector will make me re-do.

 

[ImOld]

This normally doesn't apply to residential since it is almost always 120/240 single phase. Commercial may be 120/208, 277/480, 347/600 and other single and three phase voltages. Not good to accidentally mix them. You do know this about the neutral and not ground/earth?