Low-voltage dry-type distribution transformers with kVA
ratings not appearing in the table shall have their minimum efficiency level determined by
linear interpolation of the kVA and efficiency values immediately above and below that
kVA rating. All efficiency values are at thirty-five percent of nameplate-rated load
temperature corrected to 75°C, determined according to the DOE Test Method for
Measuring the Energy Consumption of Distribution Transformers under Appendix A to
Subpart K of 10 CFR part 431.

Distribution transformer means a transformer that (1) has an input voltage of 34.5 kVor
less; (2) has an ouput voltage of 600 Vor less; (3) is rated for operation at a frequency of
60 Hz; and (4) has a capacity of 10 to 2500 kVA for liquid-immersed units and 15 to 2500
kVA for dry-type units.
The following low voltage transformers do not need to comply with the table above:
• Auto-transformers
• Drive isolation transformers
• Non-ventilated transformers
• Resin encapsulated transformers
• Buckboost transformers
• Control transformers (machine tool)
• Medical isolation panel transformers compliance with UL 1047 (tables 30.1 and 30.2)
(SPECIAL IZ —LOWLEAKAGE)
NewThree-Phase Offering from Square D — DOE 2016 EX
• Exceedthe efficiency levels from 10 CFR 431.196
• Terminals sized to handle wire ranges to match Square D circuit breakers, switches,
panelboards, etc. Located to meet NEC bending radius and layout to simplifiy
connections
• IZLevels to allow for designing with the minimum AIC Panels available
• In-rush current limited to expand the Square D circuit breaker options at both 125 and
250%sizing
• Soundlevel at 3 dB for all designs, but up to 6–10 dB below on certain units—QUIET
QUALITY
• 1/2 in. clearance from the rear and side, UL 1561alcove testing all enclosures to
not exceed 90°C on adjacent walls
• Four product families of the DOE 2016 EX: General purpose, aluminum and copper
windings, 150°C rise; Watchdog, low temperature rise, aluminum and coover
windings, 115 or 80°C rise; Two solutions for harominic loads: K-13 Wye secondary,
harmonic mitigating transformers and K-9 ZigZag secondary, harmonic mitigating
transformers.
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