I wanted to get some input into running control wires and supply wires in the same conduit servicing a roof top unit. Is this a bad idea? If so, why? I am wiring a building that has a wrap around vapour barrier and roof penetrations are to be kept to a minimum. There is a spec restricting the roof penetrations to a certain kind of "gum cup". This "gum cup" allows only one conduit or liquidtite flex conduit through it. What are your thoughts guys?
