[Code of Federal Regulations] [Title 46, Volume 4] [Revised as of October 1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 46CFR111.52-3] [Page 231] TITLE 46--SHIPPING CHAPTER I--COAST GUARD, DEPARTMENT OF TRANSPORTATION (CONTINUED) PART 111--ELECTRIC SYSTEMS--GENERAL REQUIREMENTS--Table of Contents Subpart 111.52--Calculation of Short-Circuit Currents Sec. 111.52-3 Systems below 1500 kilowatts. 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 Sec. 111.52-5 are submitted: (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 six times the aggregate normal rated currents of all motors that may be in operation. (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 four times the aggregate normal rated currents of all motors that may be in operation. (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. [[Page 232]]