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It seems that the NEC requires wire splices to be UL486D listed when used in outdoor (generally damp or wet) locations, similar to the requirement for THWN or other wet-rated wiring.

Why are special wire nuts required when receptacles, like a duplex NEMA 5-20R, have exposed terminal screws? It seems that if the junction box were flooded, there would still be a short from the receptacle terminals.

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    Receptacles should never be installed where flooding is a significant possibility. Splices may occur elsewhere. – isherwood Jul 3 '18 at 20:39
  • @isherwood I'm not saying they're installed where prone to flooding, but I think I see how that influences the requirements – Hari Ganti Jul 3 '18 at 21:54

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