Main / Sub-panel question

[jsieczko]

My main panel feeds a sub-panel in a detached garage. The feed is 3 gauge wire and is run underground in conduit (< 300 feet).

The main panel has an 80 amp breaker feeding the sub-panel, but the sub-panel has a 70 amp breaker on the feed. Is there any reason the sub-panel must have a lower amp breaker? Can the sub-panel have an 80 amp breaker, matching the breaker on the main panel?

Joe

 

[charlie b]

I am closing this thread in accordance with forum rules. This forum is intended for use by electricians and electrical contractors, inspectors, engineers, and vendors with their job-related duties. We are not allowed to provide how-to advice to persons who are not employed in this industry, or persons who do not perform electrical installation or maintenance as part of their jobs.