C37.121-1989 (R2000)

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Switchgear – Unit Substations – Requirements

Covers the requirements for three-phase unit substations for step-down operation in the range of 112.5 kVA through 1000 kVA at primary voltages of 601 volts through 38 kilovolts.

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Switchgear – Unit Substations – Requirements

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Historical

C37.121-1989 (R2000)

Switchgear – Unit Substations – Requirements

Are the documents at the ANSI Webstore in electronic Adobe Acrobat PDF format only?

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