One point worth noting here: This is a design / build contract, and the bid documents described basically what we want (the alternating panel circuits on adjascent fixtures idea) without much guidance on just how to design it as long as the design complies with all codes & ordinances. In other words, the contractor is free to design this any way he wants, as long as it meets the performance criteria and is code compliant.
Any design interference from us regarding specifics of his design would result in a contract change. If we now tell him to install separate conduits, or install NM inside the conduit, or whatever, we are changing the contract from the original condition, and affecting his cost base.
OK - so here's another question: NEC 700-9(b) states that wiring from emergency source to emergency load shall be kept entirely separate of all other wiring, other wiring shall not enter the raceway, etc (paraphrased). The obvious exceptions are inside transfer switches, exit or emergency fixtures, light outlets for exit or emergency lighting, etc.
The question is this - in this example, if the branch circuits feeding these lighting units are emergency circuits (at both panels), which are on different meters, and therefore different systems, can they be mixed as proposed above, or must they be kept separate according to 700-9(b)?
Thanks again for all the great replys,
Radar
