I have a three phase system with 3 wires coming from the pole. All are green color #6 and one of them has a white tape on it. My question is if this wire acts as hot and neutral wire of a Delta system? inside the load center the voltage hot-ground wires is 120, 120, 208, and hot-hot voltage for all three is 240. I want to wire a single 120/240 60A sub-panel by using a ALU#4 SER service entrance cable about 80 feet from the 3phase box in the rear part(a guest house)of the same building. Inside this building there is suspended ceiling and above it there is the original finished sheet rock ceiling. I wanted to know the best way to take power to the 60A sub panel. my options are: 1- to wire inside the building by connecting the wire to the finished ceiling and down to the sub-panel with or without 1"liquid tight conduit 2- to take the wire with underground pvc conduit.