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ANSI C119.1-2023
Electric Connectors - Sealed Insulated Underground Connector Systems Rated 600 V (includes complimentary copy of ANSI C119.0-2022 appended to end of document)
Covers sealed insulated underground connector systems rated at 600 V for utility applications and establishes electrical, mechanical and sealing requirements.
NEMA: National Electrical Manufacturers Association [nema]