Why is it important for the sub panel (any sub panel) to have separate ground and neutral? I’ve been studying this for 6 months and haven’t actually heard a reason. Now, heaven forbid the conduit is the equipment grounding conductor and we have a poor connection, well now you have a point that is not a low impedance path and you impose current onto it and more problems happen. There are other reasons as well but this is the major of the ball of wax. This means that potentially equipment grounding conductors that in many cases are bonding ( as the NEC now says it also does ) to metal enclosures and so on that has no need to impose currents onto and doing a case to neutral connection where you are not supposed to increase this situation. Among some other reasons this in my opinion is the most dangerous of events. The most important reason for seperation is to remove the case to neutral connection which causes current that returns to the source via the grounded “Neutral” conductor which could put the return current on all metal parts since we all know the neutral carries current. While I have you, Paul, just out theoretical curiosity, why is it important for the sub panel (any sub panel) to have separate ground and neutral? I’ve been studying this for 6 months and haven’t actually heard a reason. There is 3 conductor 4/0 al running underground from meter to house panel. Disconnect #1 is in the meter panel on the pole 150 feet from the house.ĭisconnect #2 inside the house.

150 amp panel directions