This specification sets forth the minimum requirements for a traffic signal uninterruptible power supply (UPS) system. The UPS system is designed for intersections operating LED lenses with typical loads of 700 watts or less. The UPS system shall provide a cabinet meeting all the criteria of this specification. All system components of the UPS system shall be housed within the cabinet. The UPS system shall provide reliable emergency power to a traffic signal intersection (vehicle and pedestrian) in the event of utility power failure or interruption. The UPS system shall also act as a power conditioner and/or voltage regulation device. The UPS system shall be capable of operating a signalized intersection (700 watt load) for 4 hours of full runtime when utility power is disabled and under ambient temperatures of 25˚C. The UPS system shall switch the intersection to flash mode of operation when approximately 40% of battery charge is remaining, via relay contact connection points on front panel of unit. The UPS system shall operate the intersection in the flash mode of operation (350 watt load) for an additional 2 hours. UPS system components shall be rated for a minimum 1,400 watt load capacity. The UPS system shall be designed for outdoor applications in accordance with NEMA TS2 2003, or latest revision, Section 2. All components of the UPS system shall be rated to operate under temperature extremes of -34˚C to +74˚C
