I am trying to get a handle on how UL Liquid-Tight and UL Rain-tight relate to NEMA moisture ratings (e.g. NEMA 6) and IEC IP 7) moisture ratings...what are the tests for UL Liquid-tight and Rain-tight and what would be the most comparable NEMA and IP ratings? I know that UL and NEMA have other metrics besides water ingress, but I am just interested in the water ingress portion of the standards. Thanks for the help!