An accidental electrical fire caused about $80,000 worth of damage to a storage barn and its contents at the Hinckley Company’s Oxford marina, the state Fire Marshal’s office reported today. No injuries were reported in the fire. The fire at 202 Bank Street was discovered about 12:35 p.m. Tuesday by a worker at the marina. Twenty four firefighters from Oxford, Easton and Trappe had the fire under control in 30 minutes. No boats were in the barn at the time of the fire.