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12.47 - 480V Transformer Impedance Question

Question asked by jmoore284 on Sep 14, 2018

When you have a Wye/Wye bank of 3 transformers each with a different impedance which impedance do you use for the purpose of the arc flash model? In my case I have impedances of 6.49, 6.61, and 6.53. Do you use an average which would be 6.54 or do I use the lowest value of 6.49?