Ill try to explain this as best as possible. I ran a conduit for some emergency and exit signs which were to be operated with 277. My employer orders me 12v remote emergeny lights instead of the 277 weatherproof as drawn. The GC is okay with this. I have one conduit ran and piped in completely but now have to run another conduit for the 12V according to code. My question is why? If I pulled the 12volt circuit in with the 277v circuit what problems would occur? The 12v circuit is wire rated for 600v. The 12v circuit would not power on until the 277v circuit powers off to turn on the remote heads. Is the induction going to cause problems? Any knowledge helpful, thanks.