Is a neutral conductor necessary by code @ 3 phase 480v remote distribution panel?

[ctaylo360860]

The Plant I’m working at has an existing 277/480v service disconnect inside control room. Service disconnect feeds an outside 200amp 3 phase 480 volt remote distribution panel. I’m planning on adding a 125 volt remote distribution panel off of the 200 amp so I can set pump panels for motors. “Circled in blue on drawin” My question is the neutral conductor needed both remote distribution panels? All loads from these panels are supplying 3 phase 480v equipment with no neutral loads. I don’t feel like it is, but wanted to make sure before I do all the works!

Again I appreciate all the help thanks in advance!

 

[ptonsparky]

I see no reason for one.

 

[ctaylo360860]

I see no reason for one.

Didn’t think so, but wanted to make sure… thanks for the speedy reply! If they would have pulled one to the first 200 amp rdp I would have ran one as well just to be able to use for future lighting ect…

 

[Tulsa Electrician]

I take it the dotted line from Poco is a netural, is that correct.

Not sure I understand the 125 volt part. Maybe meant 125 amp?

 

[Tulsa Electrician]

I see the 125 amp now in the pic.

 

[ctaylo360860]

I take it the dotted line from Poco is a netural, is that correct.

Not sure I understand the 125 volt part. Maybe meant 125 amp?

Yeah it’s the grounded conductor… you are correct I miss typed volts instead of amps.

 

[texie]

Yeah it’s the grounded conductor… you are correct I miss typed volts instead of amps.

Since I recall you as an avid learner, I might add that, for the most part, the only time a neutral is required(when you have no line to neutral load) is when you have a service fed from a grounded supply. In that case the neutral must be sized for the line to neutral loads but not smaller than required in 250.102. This is for fault return path.
After you are downstream from the service/bond point, it becomes a feeder and if you have no line to neutral load there is no requirement for the neutral. Just an equipment grounding conductor is required sized per 250.122.
But let's say you run a feeder of 200 amps to a panel serving all line to line load except you want a single 20 amp circuit to some line to neutral load. In this case you would need a neutral in the feeder based on a 200 amp OCPD per 250.122.
The point of the code requirements here is it is all about having a fault return path that has the capacity to trip the OCPD.