Originally Posted by Washington1
benaround,
I see where you are going with this. When you read 250.140 ex3, make sure you note that you do not have to run a 4-wire circuit, if: The grounded conductor is insulated. It's not rare that people keep reading, but if you read the code as written, it says: 3)The grounded conductor is insulated, or the grounded conductor is uninsulated and part of a Type SE service-entrance cable and the branch circuit originates at the service equipment.
Note: I believe you need to stop at the comma---which then permits you to have a 3 wire circuit from a subpanel (AKA non-service rated panel) as written in NEC 250.140 ex3