There is no requirement for a RPE.
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www.access.gpo.gov]
This requirement is for responsibility. That is why someone else signs for a check.
The key is to know where to find and understand the rules. Whenever I read a Code....I read 3 or 4 times....put it down and walk away for a bit. Then go back and read it 3 or 4 times again.
If you are still sane when you are finished it may make sense.
Dean D Cockroft