ABB R4B and R5B Automatic Transfer Switch Seismic Certification Letter

This document is a seismic certification letter from W.E. Gundy & Associates certifying that ABB R4B and R5B Automatic Transfer Switch product lines meet Special Seismic Certification requirements per CBC 2022 Section 1705A.14.3 and ICC-ES AC156 standards, based on witnessed shake table testing at Clark Testing Laboratories. It includes certified product line matrices linking ABB and Caterpillar branded ATS units, with detailed dimensions, weights, and representative UUT designations.