{"data":{"id":"us/46-cfr-111.51-4","jurisdiction":"us","citation":"46 CFR 111.51-4","heading":"-4 Short-circuit calculations for systems 1500 kilowatts or above.","body":"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:\n(a) Exact calculations using actual impedance and reactance values of system components.\n(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).\n(c) The estimated calculations using a commercially established analysis procedure for utility or industrial applications.","path":["Title 46—Shipping","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER J—ELECTRICAL ENGINEERING","PART 111—ELECTRIC SYSTEMS—GENERAL REQUIREMENTS","Subpart 111.51—Calculation of Short-Circuit Currents and Coordination of Overcurrent Protective Devices"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-46.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:22Z","sha256":"185a7dd58d4be1d47b71b8ae1ce770961e5a2758bd81e4c30d0b1ec751e629eb","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-111.51-3","next":"us/46-cfr-111.51-5"},"notice":"GroundRules: Original legal text. Not legal advice."}