ASTM F2361-18

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F2361 − 03 (Reapproved 2013) F2361 − 18 An American National Standard
Standard Guide for
Ordering Low Voltage (1000 VAC or Less) Alternating
Current Electric Motors for Shipboard Service—Up to and
Including Motors of 500 Horsepower
This standard is issued under the fixed designation F2361; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This guide covers the required basic ordering information for low voltage (1000 VAC or less) general-purpose, commercial,
universal, smallsmall-, and medium sized medium-sized alternating current electric motors for shipboard use, up to and including
motors of 500 hp.
1.2 The electric motors covered by this guide are general-purpose (GP) motors intended to drive common shipboard mechanical
machinery such as fans, blowers, centrifugal and screw pumps.
1.3 This guide is not intended to be used to order special-purpose (SP) motors or definite-purpose motors (for example,
cryogenic service) or motors for use in hazardous (classified) locations as defined by the National Electrical Code (NFPA 70).
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 Canadian Standards Association (CSA):
CSA Standard C390-93C Energy Efficiency Test Methods for Three-Phase Induction Motors General Instruction No.1
2.2 Institute of Electrical and Electronic Engineers (IEEE):
IEEE Standard 45 Recommended Practice for Electrical Installations on Shipboard
IEEE Standard 112 Standard Test—Procedure for Polyphase Induction Motors and Generators
2.3 National Electrical Manufacturers Association (NEMA) Standard:
NEMA Standard MG-l Motors and Generators
2.4 National Fire Protection Association (NFPA):
NFPA 70 National Electrical Code
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 closed-coupled—closed-coupled, n—a special design where the motor features a face mounting flange that the pump
casing mounts to, and a motor shaft extension on which the pump impeller is mounted.
3.1.2 dripproof—dripproof, n—a machine enclosure that allows the motor to be cooled by ambient air having ventilation
openings that allow operation when drops of liquid or solid particles strike the enclosure at any angle from zero to 15°.
This guide is under the jurisdiction of ASTM Committee F25 on Ships and Marine Technology and is the direct responsibility of Subcommittee F25.10 on Electrical.
Current edition approved Oct. 1, 2013Nov. 1, 2018. Published October 2013November 2018. Originally approved in 2003. Last previous edition approved in 20092013
as F2361 – 03 (2009).(2013). DOI: 10.1520/F2361-03R13.10.1520/F2361-18.
Available from Canadian Standards Association (CSA), 5060 Spectrum Way, Mississauga, ON L4W 5N6, Canada, http://www.csa.ca.178 Rexdale Blvd., Toronto, ON
M9W 1R3, Canada, http://www.csagroup.org.
Available from Institute of Electrical and Electronics Engineers, Inc. (IEEE), 445 Hoes Ln., P.O. Box 1331, Piscataway, NJ 08854-1331,08854-4141, http://www.ieee.org.
Available from National Electrical Manufacturers Association (NEMA), 1300 N. 17th St., Suite 1752, Rosslyn,900, Arlington, VA 22209, http://www.nema.org.
Available from National Fire Protection Association (NFPA), 1 Batterymarch Park, Quincy, MA 02169-7471, http://www.nfpa.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2361 − 18
3.1.3 drive method—method, n—the method of driving the equipment, such as direct, belt, gearbox, or chain.
3.1.4 effıciency classes—classes, n—standard efficiency classes established by NEMA based on motor performance.
3.1.5 end shield—shield, n—a machined flange or base which have rabbets and bolt holes for mounting equipment to the motor
or for overhanging the motor on a driven machine.
3.1.6 frame size—size, n—standard sizes established by NEMA based on motor power and speed.
3.1.7 mounting arrangement—arrangement, n—the installed operating position of the motor, such as horizontal, vertical shaft
up, or vertical shaft down.
3.1.8 multi-speed—multi-speed, n—a motor that can operate at more than one speed, typically at two or three speeds.
3.1.9 NEMA design classes—classes, n—design classifications designated by NEMA (see NEMA Standard MG-1) for motors
that provides information to the end user on characteristics such as motor starting, torque, voltage, and so forth.
3.1.10 NEMA insulation classes—classes, n—NEMA system that classifies motor insulation systems by their ability to
withstand a specified temperature for a specified length of time with minimum deterioration.
3.1.11 polyphase medium motors—motors, n—motors which have windings so arranged to accept to polyphase voltage sources.
3.1.12 service factor—factor, n—service factor for an ac motor is a multiplier, which when applied to the rated horsepower,
indicates a permissible horsepower loading which may be carried under the conditions specified for the service factor.
3.1.13 single-phase fractional horsepower motors—motors, n—motors with ratings up to 1 hp which use single-phase power.
3.1.14 single-phase integral horsepower motors—motors, n—motors with ratings of 1 hp up to and including 10 hp, which
normally use single-phase power but at the upper end of their specified range may also utilize polyphase power.
3.1.15 slip—slip, n—the difference between synchronous speed and full load speed. Normal slip is less than 5 %.
3.1.16 speed—speed, n—the number of revolutions per minute (r/min) at which an induction motor operates, which is dependent
upon the input power, frequency, and the number of magnetic poles in the machine.
3.1.17 temperature, ambient—ambient, n—th
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