I saw a home that had newly installed 3/4" liquidtite running down a wall to underground. Liquidtite is weatherproof but can it be run underground?
The 99 NEC states "Direct burial where listed
and marked for the purpose". This is for metallic and non-metallic.
Most sealtight I have installed has "suitable for direct burial" down the side of it. I would assume that the only way it could be used underground was if it was listed for that purpose
Jim