Arc Flash Studies and Electric Utility Company Short Circuit Data

[@timfrey6087]

Can you show your work for the infinite bus calculation. I can not get the 31374 amps.

[@Brainfiller]

Sure thing. SCA = short circuit amps (on secondary) FLA2 = Full Load Amps (on secondary) SCA = (FLA2 x 100) / %Z FLA2 = 1500 kVA / [sqrt(3) x 0.48 kV] = 1804 Amps SCA = [1804 Amps x 100] / 5.75 SCA = 31,374 Amps

[@timfrey6087]

Thank you