Motor Calculations Annotated Instructor’s Guide_ME_Level-4

COMPTENCIES, OBJECTIVES, AND PERFORMANCE TASKS Power Generation Maintenance Electrician Level Four Power Industry Fundamentals Power Generation Maintenance Electrician Level Two 26410-08 Motor Operation and Maintenance 26301-08 Load Calculations – Branch and Feeder Circuits 32401-09 Preventive and Predictive Maintenance 26409-08 Heat Tracing and Freeze Protection 40401-09 Standby and Emergency Systems 26407-08 Advanced Controls 26305-08 Overcurrent Protection 50401-10 Generator Maintenance 50402-11 Switchgear and Breaker Maintenance 26411-08 Medium-Voltage Terminations/Splices 26405-08 Fire Alarm Systems Power Generation Maintenance Electrician Level One Power Generation Maintenance Electrician Level Three 26309-08 Motor Calculations 26406-08 Specialty Transformers *Located in the Test Booklet. SAFETY CONSIDERATIONS Ensure that the trainees are equipped with appropriate personal protective equipment. ADDITIONAL RESOURCES This module is intended to present thorough resources for task training. The following reference work is suggested for both instructors and motivated trainees interested in further study. This is optional material for continued education rather than for task training. National Electrical Code® Handbook, Latest Edition. Quincy, MA: National Fire Protection Association. NOTE NFPA 70®, National Electrical Code®, and NEC® are registered trademarks of the National Fire Protection Association, Inc., Quincy, MA 02269. All National Electrical Code® and NEC® references in this module refer to the 2008 edition of the National Electrical Code®. Overhead projector and screen Transparencies Blank acetate sheets Transparency pens Whiteboard/chalkboard Markers/chalk Pencils and scratch paper Appropriate personal protective equipment Copy of the latest edition of the National Electrical Code® Calculator Module Examinations* Load Calculations – Branch and Feeder Circuits Annotated Instructor’s Guide MODULE OVERVIEW This module introduces the load calculations and National Electrical Code® (NEC ®) requirements for branch and feeder circuits. PREREQUISITES Prior to training with this module, it is recommended that the trainee shall have successfully completed Core Curriculum; Electrical Level One; and Electrical Level Two. OBJECTIVES Upon completion of this module, the trainee will be able to do the following: 1. Calculate loads for single-phase and three-phase branch circuits. 2. Size branch circuit overcurrent protection devices (circuit breakers and fuses) for noncontinuous duty and continuous duty circuits. 3. Apply derating factors to size branch circuits. 4. Calculate ampacity for single-phase and three-phase loads. 5. Use load calculations to determine branch circuit conductor sizes. 6. Use NEC Table 220.55 to calculate residential cooking equipment loads. 7. Select branch circuit conductors and overcurrent protection devices for electric heat, air conditioning equipment, motors, and welders. PERFORMANCE TASKS This is a knowledge-based module. There are no Performance Tasks. MATERIALS AND EQUIPMENT LIST Module 26301-08 TEACHING TIME FOR THIS MODULE An outline for use in developing your lesson plan is presented below. Note that each Roman numeral in the outline equates to one session of instruction. Each session has a suggested time period of 21 ⁄2 hours. This includes 10 minutes at the beginning of each session for administrative tasks and one 10-minute break during the session. Approximately 171 ⁄2 hours are suggested to cover Load Calculations – Branch and Feeder Circuits. You will need to adjust the time required for hands-on activity and testing based on your class size and resources. Topic Planned Time Session I. Introduction; Branch Circuit Ratings; Derating; Calculating Branch Circuit Ampacity A. Introduction _____________ B. Branch Circuit Ratings _____________ C. Derating _____________ 1. Temperature Derating _____________ 2. Voltage Drop Derating for Single-Phase Circuits _____________ 3. Voltage Drop Derating for Three-Phase Circuits _____________ D. Calculating Branch Circuit Ampacity _____________ Session II. Lighting Loads; Receptacle Loads; Multi-Outlet Assemblies A. Lighting Loads _____________ 1. Recessed Lighting _____________ 2. Heavy-Duty Lamp Holder Outlets _____________ B. Receptacle Loads _____________ C. Multi-Outlet Assemblies _____________ Session III. Show Window Loads; Sign Load A. Show Window Loads _____________ B. Sign Load _____________ Session IV. Residential Branch Circuits; Commercial Kitchen Equipment A. Residential Branch Circuits _____________ 1. Small Appliance Load _____________ 2. Laundry Circuit _____________ 3. Dryers _____________ 4. Cooking Appliances _____________ B. Commercial Kitchen Equipment _____________ Session V. Water Heaters; Electric Heating Loads; Air Conditioning Loads A. Water Heaters _____________ B. Electric Heating Loads _____________ C. Air Conditioning Loads _____________ Session VI. Motor Loads; Welders A. Motor Loads _____________ B. Welders _____________ Session VII. Review and Testing A. Module Review _____________ B. Module Examination _____________ 1. Trainees must score 70 percent or higher to receive recognition from the NCCER. 2. Record the testing results on Craft Training Report Form 200, and submit the results to the Training Program Sponsor. *Located in the Test Booklet. SAFETY CONSIDERATIONS Ensure that the trainees are equipped with appropriate personal protective equipment. ADDITIONAL RESOURCES This module is intended to present thorough resources for task training. The following reference work is suggested for both instructors and motivated trainees interested in further study. This is optional material for continued education rather than for task training. National Electrical Code® Handbook, Latest Edition. Quincy, MA: National Fire Protection Association. Transparencies Markers/chalk Blank acetate sheets Transparency pens Pencils and scratch paper Overhead projector and screen Whiteboard/chalkboard Appropriate personal protective equipment Copy of the latest edition of the National Electrical Code® Various types of fuses, including: Nontime-delay Dual-element, time-delay fuses Various types of disassembled motors, including: Squirrel cage Wound-rotor Synchronous Various types of circuit breakers Motor short circuit protector Devices used to provide motor overload protection, including: Overload relays Fuses Circuit breakers Module Examinations* Motor Calculations Annotated Instructor’s Guide MODULE OVERVIEW This module introduces the calculations used to size motor branch and feeder circuits, overcurrent protection, and disconnects. PREREQUISITES Prior to training with this module, it is recommended that the trainee shall have successfully completed Core Curriculum; Electrical Level One; Electrical Level Two; and Electrical Level Three, Modules 26301-08 through 26308-08. OBJECTIVES Upon completion of this module, the trainee will be able to do the following: 1. Size branch circuits and feeders for electric motors. 2. Size and select overcurrent protective devices for motors. 3. Size and select overload relays for electric motors. 4. Size and select devices to improve the power factor at motor locations. 5. Size motor short circuit protectors. 6. Size multi-motor branch circuits. 7. Size motor disconnects. PERFORMANCE TASKS This is a knowledge-based module. There are no Performance Tasks. MATERIALS AND EQUIPMENT LIST Module 26309-08 NOTE NFPA 70®, National Electrical Code®, and NEC® are registered trademarks of the National Fire Protection Association, Inc., Quincy, MA 02269. All National Electrical Code® and NEC® references in this module refer to the 2008 edition of the National Electrical Code®. TEACHING TIME FOR THIS MODULE An outline for use in developing your lesson plan is presented below. Note that each Roman numeral in the outline equates to one session of instruction. Each session has a suggested time period of 21 ⁄2 hours. This includes 10 minutes at the beginning of each session for administrative tasks and one 10-minute break during the session. Approximately 121 ⁄2 hours are suggested to cover Motor Calculations. You will need to adjust the time required for hands-on activity and testing based on your class size and resources. Topic Planned Time Session I. Introduction; Motor Basics A. Introduction _____________ B. Motor Basics _____________ 1. Stator Windings _____________ 2. Special Connections _____________ Session II. Calculating Motor Circuit Conductors A. Calculating Motor Circuit Conductors _____________ 1. Wound-Rotor Motors _____________ 2. Conductors for DC Motors _____________ 3. Conductors for Miscellaneous Motor Applications _____________ Session III. Motor P