Square D? I-Line Power Distribution Panelboards is ideal for service entrance equipment or downstream distribution panels in the electrical system. The I-Line power distribution panelboard is the most versatile on the market and feature Schneider Electric's unique breaker engagement system which allows 15 A branch circuit breaker next to or across from a 1200 A circuit breaker. This box adhere the the UL standards for enclosures to the degree of Type 3R, Type 5, and Type 12. After being tested and certified by UL to adhere to the specfications listed in the datasheet, this box comes with a 18 month warranty.