The SQUARE D Surface Mount CSED SC1624M100S provides metered service and a main circuit breaker and 16 full branch spaces up to 24 circuits using tandems. All-In-Ones are UL Listed, suitable only for use as service equipment. This device meets EUSERC standarts, Federal Specification W-P-115c as Type 1, Class 2. This surface mounted device has UL listed rated current rating as 100A and short-circuit current 10kA. Factory installed main breaker, compact design, overhead and or underground feed, wiring room with 6.5inch deep enclosures are ideal solution for easy installation. Knockouts above the top right-side wire gutter provides easy exit for load center wires. Factory installed blade guides on line and load meter jaws ensures proper alignment of meter blades with meter jaws to prevent meter socket damage. Forward tilted top endwall promotes water run-off to prevent pooling. All units built per ANSI C12.7, NEMA PB-1, UL standards 50, 67 and 414 and are listed in UL file number E-6294. Devices meet Federal Specifications W-P-115C for government housing. Devices meet the Electric Utility Service Equipment Requirements Committee (EUSERC) standards, meets EUSERC Requirements.