-The present document specifies the test severities and methods for verification of the required resistibility for equipment which is to be stored, transported and used in the environments which characteristics are defined in ETSI EN 300 019-1 [2]. The purpose of the present document is to provide a general overview of ETSI EN 300 019-2 [3]. ETSI TR 100 035 [i.1] should be used in conjunction with ETSI EN 300 019 multi-parts deliverable. It gives an introduction to the main concepts of environmental engineering, the purpose and use of environmental classes and the corresponding test philosophy.