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What is the Impedance (%IZ) for the EE15T3H transformer?

What is the Impedance (%IZ)  for the EE15T3H transformer?

Product Line:
LV Transformers, 600 Volts and Below, Energy Efficient
EE15T3H, 3 phase, 60 Hz,480V Delta primary, 208Y/120Vac secondary, UL Listed

Impedance of Transformers is information often required by specifications, and for calculations for Average Interrupting Current, Voltage Regulation, and other factors.

The impedance for the EE15T3H is 5.1 per the Energy Efficient Transformers Technical Data Bulletin 7400DB0702R07/09, page 4.  
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