Gounding of System Neutral
Gounding of System Neutral
(OP)
We have a 5 MVA 46kV/4160V transformer which is impedance grounded with a resistor. The secondary conductors are parallel 500 kcmil.
How do you size the neutral conductor which feeds the grounded resistor?
If you could also tell me which section of the code gives the sizing for this installation that would be great.
Thank you
How do you size the neutral conductor which feeds the grounded resistor?
If you could also tell me which section of the code gives the sizing for this installation that would be great.
Thank you






RE: Gounding of System Neutral
The conductor should be insulated for full line-to-line voltage, at least in my opinion.
RE: Gounding of System Neutral
250.190 sounds like the conductor should not be sized for less than 6 AWG copper.
Thanks
RE: Gounding of System Neutral
In reference a NEC section that addresses refer to 250.36. This however only applies to systems rated 480V to 1000V so that would not be applicable to your installation. It may offer some guideance though.
RE: Gounding of System Neutral
RE: Gounding of System Neutral
RE: Gounding of System Neutral