IEEE C37.74-2003 pdf download.IEEE Standard Requirements for Subsurface, Vault, and Pad-Mounted Load-Interrupter Switchgear and Fused Load-Interrupter Switchgear for Alternating Current Systems Up to 38 kV 4. Service conditions 4.1 Usual service conditions Apparatus conforming to this standard shall be suitable for operation at nameplate rating provided that a) The ambient
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