Unfortunately, ComEd requires us to do this live. On my very first 200-amp overhead service, I called for them to disconnect. I was told to do it live myself. I said something like "No, really, I can be here anytime". He said something like "It's your job". They will disconnect for underground services, but not overhead. Typically they come by later to crimp their connectors on. Once I moved the service across the house and draped temporary wires across the roof. I'd love to have a POCO disconnect for me.

Dave