I’m wiring a metal building with EMT raceway and THHN conductors. It’s a detached building with a 100amp “sub panel” fed from the nearby house. One branch of the EMT carries two circuits (one lighting and one RV outlet). The lighting circuit has a 12 AWG equipment ground running to all lights and connected to 3 J boxes. The RV circuit uses the EMT raceway for equipment ground. The inspector said everything has to be one way or the other. So no mixing of ground types. I can’t find any code section that agrees or disagrees with him. I’m going to just pull all the equipment ground wire out and use the raceway as the easiest solution but I would like to know if anyone can point me to something that supports his assertion. I didn’t wire it this way but I’m finishing it.
