Most homes that I have seen here (in the boonies) have either a 100 or 200 amp service. The wire which the POCO supplies to these homes appears to be the same size. Is that typical? Is there a standard size used by the POCO when establishing a service? The reason I ask is that so many times a sub-panel (or 2) is added to the main panel. Is there sufficient wiring in place to the service for these additions? How can a homeowner determine this?