StacksVerified U.S. regulatory reference

46 CFR §111.51-4

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
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:
  1. (a)Exact calculations using actual impedance and reactance values of system components.
  2. (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).
  3. (c)The estimated calculations using a commercially established analysis procedure for utility or industrial applications.