46 C.F.R. § 111.01-17 Voltage and frequency variations.
Title 46 - Shipping
Unless otherwise stated, electrical equipment must function at variations of at least ±5 percent of rated frequency and +6 percent to −10 percent of rated voltage. This limitation does not address transient conditions. [CGD 94–108, 61 FR 28276, June 4, 1996]
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PART 111—ELECTRIC SYSTEMS—GENERAL REQUIREMENTS
Subpart 111.01—General
§ 111.01-17 Voltage and frequency variations.

