Circuits from two separate buildings on two separate services in the same raceway?

[JWalker23]

I am currently designing a remodel of a building in an existing campus like setting. The building that I am working on shares its parking lot with an adjacent building. There are a total of 4 existing light poles to remain intended to light this parking lot. As a part of the remodel of the adjacent building, the contractor installed a series of raceway and boxes to provide a path of getting power to all 4 poles. However, only two of the four were energized from that adjacent building. Now we are remodeling our building, and the property manager has instructed us to intercept one of the existing boxes and provide circuits from our completely separate service to the two remaining poles on the site.

We know that what the property manager has instructed us to do clearly creates an unsafe condition in the system for numerous reasons. What I am looking for are possible code sections that I can give them that indicate that we can NOT install the system as they have requested. The project is located in Sacramento County, California if that matters.

Help me out here. Give me some backup to stop this madness.

 

[George Stolz]

As long as the conductors are disconnected near the entrance to the building, it sounds code compliant.

 

[petersonra]

We know that what the property manager has instructed us to do clearly creates an unsafe condition in the system for numerous reasons. What I am looking for are possible code sections that I can give them that indicate that we can NOT install the system as they have requested.

What is unsafe about it?

The code talks about mixing conductors of different systems in various places. I don't recall ever seeing it prohibited.

Often it seems it says something like "where conductors of different systems...". If it was not permitted, why would that kind of wording be necessary?

 

[hurk27]

While 230.3 only applies to service conductors, the few things I can think of is it would be possible that a worker could be exposed to live conductors since one or the other means of disconnect would not be accessible to both buildings, a fault in this conduit could possibly cause a parallel path between the two services, and the fact that it would be possible for someone to combine all the lights on one or the other service to avoid the cost of running them.

While I have seen installations like this mainly on condominiums that share garage stalls where they will run one conduit out to the garage with each set of circuits from each units panel, and I have seen theft of electric done at these installations because of this, but as for me, I wouldn't do it.