Grounded Neutral systems 2

[drknexus02]

well i am having some confusion as far as what the NEC requires for grounding your neutral on power distribution systems...
250.2 A (5) EFFECTIVE GROUND-FAULT CURRENT PATH-
Electrical equipment and wiring and other electrically conductive material likely to become energized shall be installed in a manner that creates a low-impedance circuit facilitating the operation of the over-current device or ground detector for high-impedance grounded systems. It shall be capable of safely carrying the maximum ground-fault current likely to be imposed on it from any point on the wiring system where a ground fault may occur to the electrical supply source. THE EARTH SHALL NOT BE CONSIDERED AS AN EFFECTIVE GROUND FAULT-PATH.

now the way i understand that is that Neutral should not be connected to ground because the only reason you do that is for ground fault-paths for overcurrent conditions or for disharmony within a transformer or genset. but there are also regs like 250.184B and C. can someone clarify this for me?

 

[PHovnanian]

Grounding is far too complicated for a technician to assess.

Maybe. But it depends on one's point of view as either a comm. or electronics technician (engineer) or a power guy.

Electronics techs are concerned with noise immunity under normal circumstances. In some cases, the optimum solution could lead to a hazardous condition during a fault. Or cause problems (loops) due to a lack of understanding of the function of various types of grounds (signal vs safety).