Revised Pages To MG 1-2006 Include MG 1-2006 Errata

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Revised pages to MG 1-2006 include MG 1-2006 ErrataPlease replace the following pages of MG 1-2006:MG 1-2006 Rev 1 Table of Contents (entirely revised)MG 1-2006 Rev 1 Part 1 (entire Part 1))MG 1-2006 Rev 1 Part 2 (entire Part 2)MG 1-2006 Rev 1 Part 4 (pp 29-42 only)MG 1-2006 Rev 1 Part 10 Ratings—AC Motors (pp 9-12) andRatings—DC Motors (pp 17-20)MG 1-2006 Rev 1 Part 12 Tests and Performance—AC Motors (pp 15-40) andTests and Performance—DC Motors (pp 41-52 replace pp 35-44)MG 1-2006 Rev 1 Part 15 (entire Part 15)MG 1-2006 Rev 1 Part 20 (pp 5-6, 13-14)MG 1-2006 Rev 1 Part 21 (pp 9-12; 25-26; 33-36)MG 1-2006 Rev 1 Part 23 (pp 9-18)MG 1-2006 Rev 1 Part 24 (entire Part 24)MG 1-2006 Rev 1 Part 31 (pp 7-14)MG 1-2006 Rev 1 Part 32 (entire Part 32)MG 1-2006 Rev 1 Part 33 (pp 9-34)

NEMA Standards Publication MG 1-2006 Revision 1-2007Motors and GeneratorsPublished by:National Electrical Manufacturers Association1300 North 17th Street, Suite 1752Rosslyn, VA 22209www.nema.org Copyright 2006 by the National Electrical Manufacturers Association. All rights includingtranslation into other languages, reserved under the Universal Copyright Convention, the BerneConvention for the Protection of Literary and Artistic Works, and the International and PanAmerican Copyright Conventions.

NOTICE AND DISCLAIMERThe information in this publication was considered technically sound by the consensus of personsengaged in the development and approval of the document at the time it was developed.Consensus does not necessarily mean that there is unanimous agreement among every personparticipating in the development of this document.The National Electrical Manufacturers Association (NEMA) standards and guideline publications,of which the document contained herein is one, are developed through a voluntary consensusstandards development process. This process brings together volunteers and/or seeks out theviews of persons who have an interest in the topic covered by this publication. While NEMAadministers the process and establishes rules to promote fairness in the development ofconsensus, it does not write the document and it does not independently test, evaluate, or verifythe accuracy or completeness of any information or the soundness of any judgments contained inits standards and guideline publications.NEMA disclaims liability for any personal injury, property, or other damages of any naturewhatsoever, whether special, indirect, consequential, or compensatory, directly or indirectlyresulting from the publication, use of, application, or reliance on this document. NEMA disclaimsand makes no guaranty or warranty, express or implied, as to the accuracy or completeness ofany information published herein, and disclaims and makes no warranty that the information inthis document will fulfill any of your particular purposes or needs. NEMA does not undertake toguarantee the performance of any individual manufacturer or seller’s products or services byvirtue of this standard or guide.In publishing and making this document available, NEMA is not undertaking to renderprofessional or other services for or on behalf of any person or entity, nor is NEMA undertaking toperform any duty owed by any person or entity to someone else. Anyone using this documentshould rely on his or her own independent judgment or, as appropriate, seek the advice of acompetent professional in determining the exercise of reasonable care in any givencircumstances. Information and other standards on the topic covered by this publication may beavailable from other sources, which the user may wish to consult for additional views orinformation not covered by this publication.NEMA has no power, nor does it undertake to police or enforce compliance with the contents ofthis document. NEMA does not certify, test, or inspect products, designs, or installations forsafety or health purposes. Any certification or other statement of compliance with any health orsafety–related information in this document shall not be attributable to NEMA and is solely theresponsibility of the certifier or maker of the statement.

MG 1-2006Page iCONTENTSPage No.Foreword .xxxvSection I GENERAL STANDARDS APPLYING TO ALL MACHINESPart 1—REFERENCED STANDARDS AND DEFINITIONS .1-11.1REFERENCED STANDARDS.1-1DEFINITIONS .1-5CLASSIFICATION ACCORDING TO SIZE .1-51.2MACHINE .1-51.3SMALL (FRACTIONAL) MACHINE .1-51.4MEDIUM (INTEGRAL) MACHINE .1-51.4.1 Alternating-Current Medium Machine .1-51.4.2 Direct-Current Medium Machine.1-51.5LARGE MACHINE .1-51.5.1 Alternating-Current Large Machine.1-51.5.2 Direct-Current Large Machine .1-6CLASSIFICATION ACCORDING TO APPLICATION.1-61.6GENERAL PURPOSE MOTOR.1-61.6.1 General-Purpose Alternating-Current Motor.1-61.6.2 General-Purpose Direct-Current Small Motor .1-61.7GENERAL-PURPOSE GENERATOR .1-61.8INDUSTRIAL SMALL MOTOR .1-61.9INDUSTRIAL DIRECT-CURRENT MEDIUM MOTOR .1-61.10INDUSTRIAL DIRECT-CURRENT GENERATOR .1-61.11DEFINITE-PURPOSE MOTOR .1-71.12GENERAL INDUSTRIAL MOTORS .1-71.13METAL ROLLING MILL MOTORS .1-71.14REVERSING HOT MILL MOTORS .1-71.15SPECIAL-PURPOSE MOTOR .1-71.16NEMA PREMIUM EFFICIENCY MOTOR.1-71.16.1 60 Hz.1-71.16.2 50 Hz.1-7CLASSIFICATION ACCORDING TO ELECTRICAL TYPE .1-81.17GENERAL.1-81.17.1 Electric Motor .1-81.17.2 Electric Generator.1-81.17.3 Electric Machines.1-81.18ALTERNATING-CURRENT MOTORS .1-91.18.1 Induction Motor .1-91.18.2 Synchronous Motor.1-91.18.3 Series-Wound Motor.1-101.19POLYPHASE MOTORS .1-101.19.1 Design Letters of Polyphase Squirrel-Cage Medium Motors .1-101.20SINGLE-PHASE MOTORS .1-101.20.1 Design Letters of Single-Phase Small Motors .1-101.20.2 Design Letters of Single-Phase Medium Motors .1-111.20.3 Single-Phase Squirrel-Cage Motors .1-111.20.4 Single-Phase Wound-Rotor Motors .1-121.21UNIVERSAL MOTORS.1-121.21.1 Series-Wound Motor.1-121.21.2 Compensated Series-Wound Motor .1-121.22ALTERNATING-CURRENT GENERATORS.1-121.22.1 Induction Generator .1-121.22.2 Synchronous Generator.1-13 Copyright 2006 by the National Electrical Manufacturers Association.

MG 1-2006Page ii1.23DIRECT-CURRENT MOTORS.1-131.23.1 Shunt-Wound Motor.1-131.23.2 Series-Wound Motor.1-131.23.3 Compound-Wound Motor .1-131.23.4 Permanent Magnet Motor .1-131.24DIRECT-CURRENT GENERATORS .1-131.24.1 Shunt-Wound Generator.1-131.24.2 Compound-Wound Generator .1-13CLASSIFICATION ACCORDING TO ENVIRONMENTAL PROTECTION AND METHODSOF COOLING .1-141.25OPEN MACHINE (IP00, IC01).1-141.25.1 Dripproof Machine (IP12, IC01) .1-141.25.2 Splash-Proof Machine (IP13, IC01) .1-141.25.3 Semi-Guarded Machine (IC01).1-141.25.4 Guarded Machine (IC01) .1-141.25.5 Dripproof Guarded Machine (IC01) .1-171.25.6 Open Independently Ventilated Machine (IC06).1-171.25.7 Open Pipe-Ventilated Machine .1-171.25.8 Weather-Protected Machine .1-171.26TOTALLY ENCLOSED MACHINE .1-171.26.1 Totally Enclosed Nonventilated Machine (IC410).1-171.26.2 Totally Enclosed Fan-Cooled Machine.1-171.26.3 Totally Enclosed Fan-Cooled Guarded Machine (IC411).1-181.26.4 Totally Enclosed Pipe-Ventilated Machine (IP44) .1-181.26.5 Totally Enclosed Water-Cooled Machine (IP54).1-181.26.6 Water-Proof Machine (IP55) .1-181.26.7 Totally Enclosed Air-to-Water-Cooled Machine (IP54).1-181.26.8 Totally Enclosed Air-to-Air-Cooled Machine (IP54) .1-181.26.9 Totally Enclosed Air-Over Machine (IP54, IC417).1-181.26.10 Explosion-Proof Machine.1-191.26.11 Dust-Ignition-Proof Machine .