Verification and Periodic Inspection and testing qualification

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I wonder?
Why do we have 2392 inspection and testing qualification when we have the more popular one 2391-50?

Which one is which? and what are the recognitions of them in the industery?

If you have a qualification of 2392, will the industry recognise you as an inspector for testing of electrical installation in dwelling? in commercial? or industrial?

Is it only for making money by offering two different versions?

Thanks

sn
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