When properly installed, seismic floor anchor brackets bring any Seismic Certified ERK Series enclosure to applicable Zone 4, Seismic Design Category (SDC) “D” and Seismic Use Group III Upper Floor Essential Equipment rating and have an Ip rating of 1.5. Includes four brackets.- Anchoring bracket set supports a seismic-certified installation- Can be used to reinforce any mission-critical application- One set required per rack