Historical
NEMA ICS 3.1-2019
Guide for the Application, Handling, Storage, Installation and Maintenance of Medium Voltage AC Contactors, Controllers and Control Centers
NEMA ICS 3.1-2019 contains practical information for architects, electrical engineers, contractors and maintenance personnel on the handling, storage and installation of ac general-purpose medium voltage contactors and Class E controllers.
NEMA: National Electrical Manufacturers Association [nema]