1、An AmericAn nAtionAl StAndArdNECA 230-2010Standard forSelenullinnull nullstallinnull and MaintaininnullnullenullrinullMotors and Motor Controllersnullnullished nullnulltional nullenullrinulll Contranullors nullsonullationTStandard for Selecting,Installing, and MaintainingElectric Motors andMotor Con
2、trollersNECA 230-2010An AmericanNational StandardPublished byNational ElectricalContractors Associationiii a73Foreword .v1. Scope 11.1 Products and Applications Included . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11.2 Regulatory and
3、 Other Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12. ReceivingandStorage . 22.1 Packaged Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4、 . . . . . . . . . .22.2 Loose Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22.3 Motor Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5、 . . . . . . . . . . . . . . . . . . . . . . . . . .22.4 Physical Damage and Moisture Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23. Motor Selection . 33.1 Power Supply Characteristics . . . . . . . . . . . . . . . . . . . . . . .
6、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33.2 Motor Design-Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34. Motor BranchCircuitConductors . 44.1 Single Motor . . . . . . .
7、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44.2 Several Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8、 . 44.3 Full-Load Current (FLC) Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44.4 Motor Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9、. . . . . . . . . 44.5 Full-Load Current (FLC) Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44.6 Full-Load Current (FLC) Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10、 . . . . . . . . . . . . 44.7 Conductor Temperature Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55. Motor Branch-CircuitShort-CircuitandGround-Fault Protection65.1 Locked-Rotor Current (LRC) . . . . . . . . . . . . . .
11、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65.2 Rating or Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65.3 Individual Motor Circuit . . . . . .
12、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65.4 Taps from Feeders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65.5 More Than One
13、 Motor or Motor(s) and Other Loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75.6 Single-Phasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76. MotorandBranch
14、-CircuitOverloadProtection . 86.1 Continuous Duty Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86.2 Separate Overload Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15、 . . . . . . . . . . . . . . . . . . . . . 86.3 Service Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86.4 Motor Temperature Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86.5 Fuses as Overload Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97. DisconnectingMeansforMotorandController 107.1 Motor . . . . . . . . . . .
17、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107.2 Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18、. . . 107.3 Types of Motor Disconnects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10Table ofContents8. Motor ControlCircuits . 128.1 Source of Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128.2 Overcurrent Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128.3 Control Circuit Transformer . . . . . . . . . . . . . . . . . . . .
20、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128.4 Disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .128.5 Protection from Physical Damage . . . . . . .
21、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138.6 Adjustable-Speed Drive System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139. Motor Controllers .149.1 Rating . . . . . .
22、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .149.2 Controller Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23、 . . . . 149.3 Controller Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149.4 Wiring Space in Enclosures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24、. . . . . . . . . . . . .159.5 Controller Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1510. Motor TerminalHousings.1610.1 Dimensions and Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1610.2 Equipment Grounding C onnections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1611. Motor WiringConnections .1711.1 High-Voltage Connections . . . . . . . . .
26、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1711.2 Low-Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1711.3 Motor Rotation . . . . . . .
27、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1712. Installinga 3-PhaseMotor . 1813. ElectricMotorMaintenance.1913.1 Lubrication and Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28、 . . . . . . . . . . . . . . . . . . . . . . . . . .1913.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1913.3 Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Annex A:Tables . 21Motor Starter Selection Data Sheet (Courtesy Square D Company) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21NEC Table 310.16 (Courtesy National Fire Protection Associatio
30、n) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22NEC Table 430.10(B) (Courtesy National Fire Protection Association) . . . . . . . . . . . . . . . . . . . . . . . . . . . .23NEC Table 430.12(B) (Courtesy National Fire Protection Association) . . . . . . . . . . . . . . . . . . . . .
31、 . . . . . . .23NEC Table 430.52 (Courtesy National Fire Protection Association) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23NEC Table 430.72(B) (Courtesy National Fire Protection Association) . . . . . . . . . . . . . . . . . . . . . . . . . . . .24NEC Table 430.248 (Courtesy Nat
32、ional Fire Protection Association) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24NEC Table 430.250 (Courtesy National Fire Protection Association) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25NEC Table 430.251(B) (Courtesy National Fire Protection Association) . . . .
33、. . . . . . . . . . . . . . . . . . . . . . .26Annex B:WiringDiagrams 27Wiring Diagram: High Voltage and Low Voltage Delta Motor Windings . . . . . . . . . . . . . . . . . . . . . . . . .27Wiring Diagram: High Voltage and Low Voltage Star (Y) Motor Windings . . . . . . . . . . . . . . . . . . . . .
34、. .27Wiring Diagram: One Three-Wire Stop-Start Station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28Wiring Diagram: Two Three-Wire Stop-Start Stations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29Wiring Diagram: Hand-Off Autom
35、atic Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30One Line Diagram: Motor Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31Annex C:ReferenceStandards . 32NECA230 Standard fo
36、r Selecting, Installing, and Maintaining Electric Motorsand Motor Controllersa73 ivv a73National Electrical Installation Standards (NEIS) areintended to improve communication among speci-fiers, purchasers, and suppliers of electrical construc-tion services. They define a minimum baseline ofquality a
37、nd workmanship for installing electrical prod-ucts and systems. NEIS are intended to be referencedin contract documents for electrical construction pro-jects. The following language is recommended:Electric motors and motor controllers rated 600volts or less shall be installed and maintained inaccord
38、ance with NECA 230-2010, Standard forSelecting, Installing, and Maintaining ElectricMotors and Motor Controllers (ANSI).Use of NEIS is voluntary, and the National ElectricalContractors Association assumes no obligation or lia-bility to users of this publication. Existence of astandard shall not prec
39、lude any member or non-member of NECA from specifying or using alternateconstruction methods permitted by applicable regu-lations.This publication is intended to comply with the edi-tion of the National Electrical Code (NEC) in effectat the time of publication. Because they are qualitystandards, NEI
40、S may in some instances go beyondthe minimum requirements of the NEC. It is theresponsibility of users of this publication to complywith state and local electrical codes when installingelectrical products and systems.Suggestions for revisions and improvements to thisstandard are welcome. They should
41、 be addressed to:NECA Standards however the ampacityused must be less than or equal to that shown in the60C column. Information regarding temperaturelimitations is found in NEC 110.14(C).Standard for Selecting, Installing, and Maintaining Electric Motors NECA 230and Motor Controllers5 a73The motor b
42、ranch circuit is the circuit between thebranch-circuit short-circuit and ground-fault protec-tive device and the motor terminals. It can be either amotor circuit tapped from a feeder, or an individualcircuit to a motor that is connected directly to anovercurrent device in a distribution panel.Motor
43、branch-circuit short-circuit, and ground-faultprotective device, sizing requirements for motorsrated 600 volts or less are in NEC Article 430, Part IV.These requirements add to or amend the provisionsof NEC Article 240, Overcurrent Protection. Theseadditions or amendments are required because of the
44、particular characteristics of motors regarding lockedrotor current (LRC).5.1Locked-RotorCurrent(LRC)The moment a motor is started, during the accelerationperiod, the motor draws a high in rush current. This inrush current is also called locked-rotor current (LRC)and can be as high as from 4 to 10 ti
45、mes the full loadcurrent (FLC). Most motors have a LRC of about 6times the FLC, and this figure is the one generally used.The motor overload device permits the high startingcurrent, which is required to start the motor, to flow fora short period of time and will open the motor branchcircuit after a
46、predetermined time (See chapter 6).5.2RatingorSettingThe short-circuit and ground-fault protective devicefor a motor branch-circuit must be capable of carry-ing the starting current (inrush current) of themotor. A protective device with a rating or settingnot exceeding the value calculated in accord
47、ance withthe values shown in NEC Table 430.52 must be used.This table lists the types of motors in the first col-umn and the following four columns show the vari-ous overcurrent devices that are used for motor pro-tection.If the motor cannot be started using protectivedevices rated as shown in NEC T
48、able 430.52, theexceptions to NEC 430.52(C)(1) may be used.However, the installer should determine that highinrush current is the problem before increasing thesize of the protective devices, and that the motor iscapable of handling the physical load attached to it.5.3IndividualMotorCircuitFor an ind
49、ividual circuit feeding directly from anovercurrent device in a distribution panel to a motor,the motor branch circuit conductors must be sized asshown in Section 4 of this publication and these con-ductors must be protected in accordance with NEC430.52. If the value of overcurrent protection speci-fied in NEC Table 430.52 does not correspond to thestandard sizes or ratings of overcurrent devices, ahigher size, not exceeding the next standard size, ispermitted.Where the rating or size shown in NEC Table 430.52is not sufficient for the starting current of the motor,the size or rating sho
