Carlon Zip Box Blue nonmetallic switch and outlet boxes the contractor's choice for easy installation. Carlon has long been the leader with the world's broadest line of nonmetallic, non-conductive wiring management products designed for easier installation, greater performance, and lower installation cost. And that includes our full line of Zip Box Blue nonmetallic switch and outlet boxes.Designed for use with nonmetallic sheath cable in accordance with Article 370 of the National Electrical Code, they make fast work of any residential or light commercial application. Take a closer look, and you'll see more reasons why they're the right choice for you.