This standard applies to enclosed assemblies of single-phase and three-phase, dead-front and live-front, subsurface, vault, and padmounted, load-interrupter switches with or without protective devices such as fuses or fault interrupters, up to 38 kV rated maximum voltage.
IEEE C37.74-2014
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IEEE Standard Requirements for Subsurface, Vault, and Padmounted Load-Interrupter Switchgear and Fused Load-Interrupter Switchgear for Alternating Current Systems up to 38 kV