smoothops10
Member
- Location
- FL
- Occupation
- EE
Hey all, I may be looking at this wrong but wanted to get some input. If I have a 3P,4W 277/480 service in building A and want to run a feeder to an MCC in building B (will be the only feeder serving the building with all loads downstream of MCC) which has no 277v line neutral loads and probably never will - does a 4W (+G) feeder with neutral need to be pulled to building B? I cannot really think of a good reason if it is not used. How does 225.36 come into play - can you get a 3P,3W MCC 'suitable for use as service equipment'? I've never seen this and utility would not supply a 3P,3W system if put on its own service in the future anyway. Is that the point of 225.36, the code is anticipating the possibly that the building will be fed from a feeder now but possibly a service in the future or is there more to it? Could I just put in a 3P,4W mcc and feed it with 3W (+G) or is that against the listing of the MCCs intended use?
The 2012 UL marking and application guide (pg12-13 on google) makes me feel like we need to run the neutral to get the 'suitable for us as service equipment'.
Is there any other benefit to having the neutral run with the feeder other than being able to serve 277v loads? I cannot think of any but I'm often proved wrong.
Any thoughts appreciated - thanks all.
The 2012 UL marking and application guide (pg12-13 on google) makes me feel like we need to run the neutral to get the 'suitable for us as service equipment'.
Is there any other benefit to having the neutral run with the feeder other than being able to serve 277v loads? I cannot think of any but I'm often proved wrong.
Any thoughts appreciated - thanks all.