§ 111.51-4 — -4 Short-circuit Calculations For Systems 1500 Kilowatts Or Above

Short-circuit calculations must be submitted for systems with an aggregate generating capacity of 1500 kilowatts or more by utilizing one of the following methods:

(a) Exact calculations using actual impedance and reactance values of system components.

(b) Estimated calculations using IEC 61363-1:1998 for AC systems and IEC 61660-1:1997 for DC systems (both incorporated by reference; see § 110.10-1 of this subchapter).

(c) The estimated calculations using a commercially established analysis procedure for utility or industrial applications.