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Distribution Transformers (Superseded)

Rev7
IssuedAug 26, 2026

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1 Scope

NOTE This standard has been superseded and is retained only for existing adoptions and revision history. (1.1)
NOTE The original scope combined low-voltage dry-type units and medium-voltage units in one standard; use-case-specific option lists ("(dry-type only)", "(pad-mounted only)") made a split the correct structure. (1.2)
NOTE Dry-type transformers rated 600 V and below (UL 1561, IEEE C57.12.01) are covered by Low Voltage Dry Type TransformersLow-Voltage Dry-Type TransformersResolves to the current adopted revision.sync/low-voltage-dry-type-transformers. (1.3)
NOTE Transformers with a primary voltage above 600 V — liquid-immersed pad-mounted units (IEEE C57.12.34) and medium-voltage dry-type units (UL 1562) — are covered by Medium Voltage TransformersMedium-Voltage Distribution TransformersResolves to the current adopted revision.sync/medium-voltage-transformers. (1.4)
NOTE Existing adoptions of this standard continue to function against their adopted revision; new projects should adopt the successor standards. (1.5)

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