The requirements of this Annex applies to the enclosure that are additionally considered to be concrete tight.

NEMA BI 50025-2024
Original price was: $49.00.$24.00Current price is: $24.00.
Concrete Tightness of Enclosures, Outlet Boxes, Junction Boxes, and Conduit Fittings
National Electrical Manufacturers Association , 05/02/2024