{"data":{"id":"us/46-cfr-111.51-3","jurisdiction":"us","citation":"46 CFR 111.51-3","heading":"-3 Short-circuit calculations for systems below 1500 kilowatts.","body":"The following short-circuit assumptions must be made for a system with an aggregate generating capacity below 1500 kilowatts, unless detailed computations in accordance with § 111.51-4 are submitted:\n(a) The maximum short-circuit current of a direct current system must be assumed to be 10 times the aggregate normal rated generator currents plus 6 times the aggregate normal rated currents of all motors that may be in operation.\n(b) The maximum asymmetrical short-circuit current for an alternating current system must be assumed to be 10 times the aggregate normal rated generator currents plus 4 times the aggregate normal rated currents of all motors that may be in operation.\n(c) The average asymmetrical short circuit current for an alternating-current system must be assumed to be 8 1/2 times the aggregate normal rated generator currents plus 3 1/2 times the aggregate normal rated currents of all motors that may be in operation.","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":"db3e99ff8636a3a9c8368dd2b11f894d151ddfb01cfb106bdc652fe2d6ac3c39","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-111.51-2","next":"us/46-cfr-111.51-4"},"notice":"GroundRules: Original legal text. Not legal advice."}