What is the minimum size copper service conductor permitted for a new single-phase dwelling rated at 200 AMP with no adjustments?

The minimum size copper service conductor permitted for a new single-phase dwelling rated at 200 AMP is 2/0 AWG. This is determined by the National Electrical Code (NEC) requirements, which outline the necessary conductor sizes based on the service rating and type of conductor material. For a 200 AMP service, the NEC specifies that a minimum of 2/0 AWG copper wire is required when no adjustments or allowances for temperature or other factors are made.

This is essential for ensuring proper electrical flow, safety, and compliance with established standards. Using a conductor of inadequate size can result in overheating and potentially create risks such as fire hazards or equipment damage. Therefore, the choice of 2/0 AWG copper wire is correct, as it meets the necessary specifications for safely handling the load of a 200 AMP service.