IEEE C37.74-2025

This standard applies to enclosed assemblies of single-phase and three-phase, dead-front and live-front, subsurface, vault, and pad-mounted, load-interrupter switches with or without protective devices such as fuses or fault interrupters, up to and including 38 kV rated maximum voltage.



Revision Standard - Active. Required definitions, ratings, procedures for performing design tests and production tests, and construction requirements for subsurface, vault, and pad-mounted load-interrupter switchgear and fused load-interrupter switchgear for ac systems up to and including 38 kV are covered in this standard.