Testing metal enclosed assemblies

Testing of metal-enclosed switchgear assemblies 14/427 Table 14.5 Temperature rise limits for buses, bus connections and other parts of a switchgear assembly... 

This test is applicable to all outdoor metal-enclosed switchgear and controlgear assemblies, as in lEC 60298, lEC 60694 and ANSI C-37/20C. The enclosure to be tested should be complete in all respects including its mounts, bushings (for HT switchgear assemblies, 1 kV and above) and wiring. One or more vertical units can be tested simultaneously as may be convenient, but not more than 3 m panel width can be tested at a time. For a multiple unit switchboard, however, at least two vertical units should be tested together to check the joints between the units. 

Testing of metal-enclosed switchgear assemblies 14/435 Insulation resistance method... 

Testing a bus system is generally along similar lines to those for a switchgear assembly, discussed in Chapter 14. In this chapter we discuss additional tests that are specifically for a metal-enclosed bus system,... 

The procedure and test requirements will remain the same as that discussed in Section 14.3.2, for metal-enclosed switchgear and controlgear assemblies. 

The greatest difficulty in using corrosive gas tests comes in deciding how to test entire assemblies of equipment, rather than just the metallization schemes used for connectors, and in evaluating equipment for those indoor environments where the RH may reach close to 100 %. The Battelle, Bellcore, and Siemens test conditions are intended for simulations of metals that will be used in office buildings, homes, and other air-conditioned environments. Enclosed environments such as sheds, utility huts, and non-air-conditioned manufacturing environments are more like outdoor than indoor environments with respect to RH. Standardized test conditions are not available. At this time, the test engineer has little alternative but to use the conditions that work for metals in indoor environments to cover all "enclosed" environments. 

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