Hey all, I recently added an addition onto my house. ( 1800 sqft). I had to move the service entrance. So I added a disconnect after the meter ran SER to the main feeder in the basement then isolated the neutrals from the grounds. That part of the job went good. Now the next step is to add a subpanel to the second floor. The subpanel will be no more than 40 feet away from the main feeder in the basement. I am not sure what size subpanel I am using yet but my question is, Being I have Isolated the neutrals and grounds in the main feeder in the basement. Do I also have to isolate the subpanel neutrals and grounds.