Install this sub panel if your main service panel is full yet you want to add some additional circuits to your home. It's the smart choice for value-minded contractors, remodelers, builders and homeowners. For added safety, it has shielded bus and interior assembly for a more rugged but also more user friendly panel. 1 Phase, 3 Wire, 120/240VAC, it has 2 spaces, expandable to 4 circuits maximum with the use of Homeline tandem or quad breakers. It is a Type 1 Indoor enclosure with combination flush/surface trim to meet all mounting situations and is CSA approved for vertical, horizontal or inverted mounting. Main Wire Size - AWG/kcmil: #12-3 Al, #14-4 Cu.