200 amp panel in a silo room, has no 120 volt loads, is it permissible to omit the neutral?
Yes, if it is not a service.
Don't forget that you can size your service neutral to the size of an EGC from the same amperage in such a case.
OP- do you really want to do this? Only reason I play worse case scenario because soon or latter a 120 volt load will be added to that panel.
A 30 hp motor on single phase with a vfd 2 10 hp single phase motors a couple smaller motors. Will have 2 panels in close proximity and will have a neutral in one of them
Code reference please?
The smallest that service neutral can be is the same size as the GEC and GEC is based on 250.66.
The grounded conductor size is based on 250.102(C)
Code reference please?
The smallest that service neutral can be is the same size as the GEC and GEC is based on 250.66.
(A) Connections to a Rod, Pipe, or Plate Electrode(s). If the
grounding electrode conductor or bonding jumper connected
to a single or multiple rod, pipe, or plate electrode(s), or any
combination thereof, as described in 250.52(A)(5) or (A)(7),
does not extend on to other types of electrodes that require a
larger size conductor, the grounding electrode conductor shall
not be required to be larger than 6 AWG copper wire or 4 AWG
aluminum wire.
The grounded conductor size is based on 250.102(C)
A GEC can be as small as a number 6 for a 4000amp service.
Though this would not count for a service neutral anyway.
Yes, ground rods etc.
Thank you! I was thinking EGC for some reason.
yup. We both got mixed up on this one.
So what code section allows you to size a service noodle using T250.102 as the minimum size?
Honestly, I don't remember. :ashamed1: Its still to early in the morning for me. :lol:
250.24(C)(1)
1) Sizing for a Single Raceway. The grounded conductor shall not be smaller than specified in Table 250.102(C)(1).
Thank you! And I'm right to think I can't use the conduit as the grounded conductor?
Yes.
Yes, if it is not a service.