What is the minimum size of a service entrance cable for a 200-amp service?

The minimum size of service entrance cable for a 200-amp service is indeed 2/0 AWG copper or 4/0 AWG aluminum. This is based on the National Electrical Code (NEC) standards, which outline the appropriate conductor sizes required for various amperage ratings.

Using 2/0 AWG copper is necessary because it can safely carry up to 200 amps, taking into account factors such as conductor ampacity and possible voltage drop. Similarly, 4/0 AWG aluminum is also suited for a 200-amp service, as aluminum conductors require larger gauge sizes compared to copper to carry the same amount of current due to their lower conductivity.

The other options do not meet the minimum requirements for safely handling a 200-amp service, as they either underestimate the necessary wire gauge for copper or aluminum, or fail to meet the NEC guidelines regarding proper conductor sizes. Thus, the choice of 2/0 AWG copper or 4/0 AWG aluminum ensures compliance with safety standards and effective performance in electrical systems.