The SnapNrack 100 UL Roof Mount System is an efficient, visually appealing, solar module installation system for a residential roof. 100 is Listed to the UL Standard 2703 for Bonding, meaning that all system products have been Certified by UL for electrical continuity, eliminating the need for additional grounding hardware. It has also been certified as Class A Fire Rated with Type 1 and Type 2 modules.