I have a customer who has 2 electrical services on his property. Service A powers the house. Service B is for his shop. Both meters are on the house. I'm going to install a solar system on the shop and need to attach it to service A. I'm looking for the code section(s) that discuss whether I can pull the solar system feeders to service A in the same conduit that the feeders for service B are in. (Inverter will be on the shop so only AC voltage will be in the conduit.)