Multiple Industrial Buildings - Service Entrance Discussion

Status
Not open for further replies.
1

17Steve69

Member
Location
Montana
I have inherited a semi-designed project. We have several buildings on an industrial campus housing several industrial processes. The motors for these buildings are fed power from an MCC in a centrally located, but separate building. There was a service entrance installed in a few of these buildings, which consists of a 480V, 3 phase panel. This panel feeds 277V LED lighting, a boiler and some room for expansion. In addition, the boiler building has motors in it, which are fed from the MCC building. And last but not least, the 120VAC feed to this boiler building originates in the MCC building from a lighting transformer. It consists of a few 120V circuits ran to the building with no disconnect or breakers located in the boiler building. Below summarizes the power feeds:
1. 480V service entrance panel in boiler building for 277V LED lighting and heat trace, misc three phase loads, and room for expanision.
2. Motors in boiler building fed from an MCC located in a separate building.
3. 120VAC fed to boiler building from branch breakers located in the MCC building. It consists of three circuits on 20A breakers.

My question is this an acceptable practice (in compliance with NEC and an acceptable approach from a design standpoint)?
 
Since you made this thread, something about this central MCC design must be making you question it.

What do YOU think the NEC requires in situations like this?
 
Cow said:
Since you made this thread, something about this central MCC design must be making you question it.

What do YOU think the NEC requires in situations like this?
Click to expand...

I should have reviewed this again (reviewed it a couple months ago) before posting. I think I have misinterpreted this. After reviewing the issue again, if NEC is defining the service entrance as the point at which the facility receives power from the utility, then these other buildings don't have service entrances. It is a supervised, single management facility, so I will use the provisions in 225 to supply these buildings, via feeders or branch circuits from the main power building and label them accordingly. Is this what you were leading too?

Can I tie all my EGC's (at least the ones served by the panel) in this building to this one panel and run a single conductor over to tie to the lighting/power transformer panel for the 208/120 and to the service entrance for the 480V panel?
 
Status
Not open for further replies.
Top