Scope of Section 22 applies to the installation of electrical equipment “in locations in which corrosive liquids, vapours, or excessive moisture are likely to be present.”
Section 22 also covers installation of electrical equipment in sewage lift and treatment plants. Areas covered by Section 22 are classified as Category 1 or Category 2 locations. Code users should be able to classify the respective areas accordingly based on the definitions of Category 1 or Category 2, and select types of electrical equipment and wiring methods, as appropriate for the established Category.
In addition, sewage lift and treatment plants must also be classified for hazardous areas in accordance with Section 18.
So, at the first glance, everything should be reasonably simple for the purpose of applying appropriate requirements of Section 22.
However, there appears to be some confusion in respect to the application of installation requirements in wet locations in conjunction with the installation requirements in Category 1 locations.
Apparently, there is also a degree of confusion as to whether a typical sewage lift and treatment plant must be automatically classified as Class I hazardous location.