Useful Life of Metal-Enclosed Switchgear

We are frequently asked how long we expect metal-enclosed switchgear to last in service; what is the design life of our products? Other than the very complex procedures used in the nuclear industry, there is absolutely nothing in any industry standard that addresses this question, for the very good reason that there is no reasonable way to test the life of a piece of switchgear other than to put it into service and see how long it lasts.
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