I'm wiring a detached garage/ apartment that needs a 100 amp sub panel and a 3 way switch run to the existing house. Can I run the wires for the switch leg in the same conduit as the feeder assuming the conduit is sized and derated properly. I've never run any other wire with the feeder before, so I'm curious if it's allowed. I searched the NEC, but couldn't find any reference. Thanks for the help.
