The Carlon Zip Box Blue 1-Gang 18 cu. in. Non-Metallic Switch and Outlet Box is designed for use with non-metallic sheathed cable in accordance with Article 314 of the National Electric Code. Great for residential and light commercial applications, the box is made with PVC, is Listed for use with masonry walls and can be used with 90°C conductors. It meets NEMA OS-2 and is fire rated and UL Listed for safety.