Certifications and Standards
Two words: "field evaluation"

Most Authorities Having Jurisdiction defer to the opinion of a Nationally Recognized Testing Laboratory (UL, Intertek ETL, CSA, MET, etal)1 as to whether a machine is safe or not.  Normally, the listing and labeling process that conveys that "UL has tested this and found it safe" takes place as part of factory production of the machine.

However, your situation, where you have an unlisted machine already and you want someone to see if it's safe or not, isn't an uncommon one in industry for custom, old, or imported machinery, so UL and company provide an "out" called a field evaluation where they come to your site and test/inspect the item of machinery in question, then provide a "one off" field evaluation label for it if it passes all the tests they throw at it.

Expect this to be not cheap though -- you're paying for the equivalent of a one-off listing here, so costs are going to be somewhere in the vicinity of getting a product listed + travel costs for the NRTL folks as well.




The notion of a NRTL that lists products is North American.  However, for the equivalent of listing markings in other countries (the GS product safety mark in Europe, for example), there will be a set of labs (for GS, this is normally either of the two TUVs) that are authorized to test products to the applicable standards and apply the mark if the product passes the tests.