ICS 29.160.01K 20National Standard of the People’s Republic of ChinaGB 14711-2006Substitute for GB 14711-1993Safety Requirements of Small and Medium Size Rotating Electrical Machines Issued on August 25, 2006Effective from March 1, 2007Issued byGeneral Administration of Quality Supervision, Inspection and Quarantine of the P. R. ChinaStandardization Administration of the People's Republic of China GB14711-2006ContentsForeword…………………………………………………………………………………………………………………..III1 Scope…………………………………………………………………………………………………………………….12 Normative sources of standards…………………………………………………………………………………………. 13 Technical terms and explanations………………………………………………………………………………………..24 General requirements……………………………………………………………………………………………………. 25 Structure…………………………………………………………………………………………………………………. 26 Symbols………………………………………………………………………………………………………………….. 67 Tests……………………………………………………………………………………………………………………… 78 Low voltage (rated voltage≤1, 000V)AC motor (including universal motor)…………………………………………129 High voltage (rated voltage>1, 000V) AC motor……………………………………………………………………….1310 DC motor………………………………………………………………………………………………………………1311 Portable and auxiliary generator……………………………………………………………………………………….1412 Variable-frequency & adjustable-speed motor……………………………………………………………………….. 16I GB14711-2006ForewordAll the technical content of the standard is compulsory.The standard is consistent with the safety requirements in GB755-2000 Rotating Machine Rating and Performance.ThestandardisasubstituteforGB14711-1993GeneralSafetyRequirementsofSmallandMediumRotatingElectrical Machines, with the present title Safety Requirements of Small and Medium Size Rotating Electrical Machines.The standard differs from GB14711-1993 mainly in the following respects:1.2.Standard was rearranged;Thesafetyrequirements ofportable,auxiliary,and variable-frequency&adjustable-speedmotors wereincluded;3.Tables related were placed at the back of this book, for easy reference.The standard is proposed by China Electrical Equipment Industry Association.The preparationandmanagement ofstandard isunder thesupervision ofthe ChinaRotating ElectricalMachineStandardization & Technology Committee (SAC/TC 26).ShanghaiElectrical EquipmentResearch Institutewas responsiblefor thedrafting ofthe standard.Otherorganizationsthatparticipated inthedraftinginclude:BeijingB.J. ElectricMotorCo.,Ltd.,ChongqingSailimengElectric MotorCo.,Ltd., ShandongQilu ElectricMotorManufacturing Co.,Ltd., LanzhouElectric MotorCo.,Ltd.,ShanghaiUnitedElectricMotor(Group)Corporation,ZhejiangJinlongElectricMotorCo.,Ltd., ShandongHualiElectr