Qualification testing of class 1E switchgear per 1974 seismic standards

The requirements for seismic qualification of Class 1E equipment have been continually evolving for the past several years. 1 Periodically, this evolution arrives at a plateau of such significance that the decision to evaluate the equipment at that level is worth the investment of material, time and money. The IEEE Std. 344-1971, having currently undergone working group revision to Draft Rev. 3, is a broad general document. This paper delineates these general requirements for a specific product, in this case switchgear.