Motors Calculations
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Motor Calculations Module 26309-05
National Center for Construction Education and Research
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
ncy 1
Objectives
Upon completion of this module, you will be able to do the following: 1. 2. 3. 4. 5. 6. 7.
Size branch circuits and feeders for electric motors. Size and select overcurrent protective devices for motors. Size and select overload relays for electric motors. Size and select devices to improve the power factor at motor locations. Size motor short circuit protectors. Size multi-motor branch circuits. Size motor disconnects.
ncy 1a
Performance Tasks
This is a knowledge-based module; there is no performance testing.
ncy 2
Figure 2 - Squirrel cage rotor
ncy 3
Figure 3 - Types of windings found in three-phase motors
ncy 4
Figure 4 - Dual-voltage, wye-connected, three-phase motors
ncy 5
Figure 5 - Equivalent parallel circuits
ncy 6
Figure 6 - Arrangement of leads in a nine-lead, delta-wound, dual-voltage motor
ncy 7
Figure 7 - Lead connections for a three-phase, dual-voltage, delta-wound motor
ncy 8
Figure 8 - Lead connections for a 12-lead, dual-voltage, delta-wound motor
ncy 9
Figure 9 - Fifteen-lead motor
ncy 10
Figure 10 - Basic elements of any motor circuit
ncy 11
Figure 11 - Typical motor control center
ncy 12
Figure 12 - Sizing motor branch circuits
ncy 13
Figure 13 - Ratings of nontime-delay fuses for typical motor circuits
ncy 14
Figure 14 - Fuse application guidelines for motor branch circuits
ncy 15
Figure 15 - Determining running current with an ammeter
ncy 16
Figure 16 - Motor starting current characteristics
Transparency 17
National Center for Construction Education and Research
Figure 17 - Time-current characteristics of dual-element fuses and overload heaters
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
Transparency 18
National Center for Construction Education and Research
Figure 18 - Circuit components of a typical 10-horsepower motor
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
Transparency 19
National Center for Construction Education and Research
Figure 19 - Combination motor starter with magnetic-only circuit breakers
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
Transparency 20
National Center for Construction Education and Research
Figure 20 - Typical 30-horsepower Design B energy efficient motor circuit
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
Transparency 21
National Center for Construction Education and Research
Figure 21 - Several motors on one branch circuit
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
Transparency 22
National Center for Construction Education and Research
Figure 22 - Several smaller motors supplied by one branch circuit
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
Transparency 23
National Center for Construction Education and Research
Figure 23 - Placement of capacitors in a motor circuit
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
Supplemental Art
National Center for Construction Education and Research
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
National Center for Construction Education and Research
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
Figure 1 - Basic parts of a three-phase motor
National Center for Construction Education and Research
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
Think about it - Overload Protection
National Center for Construction Education and Research
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
National Center for Construction Education and Research
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
ncy 1
Objectives
Upon completion of this module, you will be able to do the following: 1. 2. 3. 4. 5. 6. 7.
Size branch circuits and feeders for electric motors. Size and select overcurrent protective devices for motors. Size and select overload relays for electric motors. Size and select devices to improve the power factor at motor locations. Size motor short circuit protectors. Size multi-motor branch circuits. Size motor disconnects.
ncy 1a
Performance Tasks
This is a knowledge-based module; there is no performance testing.
ncy 2
Figure 2 - Squirrel cage rotor
ncy 3
Figure 3 - Types of windings found in three-phase motors
ncy 4
Figure 4 - Dual-voltage, wye-connected, three-phase motors
ncy 5
Figure 5 - Equivalent parallel circuits
ncy 6
Figure 6 - Arrangement of leads in a nine-lead, delta-wound, dual-voltage motor
ncy 7
Figure 7 - Lead connections for a three-phase, dual-voltage, delta-wound motor
ncy 8
Figure 8 - Lead connections for a 12-lead, dual-voltage, delta-wound motor
ncy 9
Figure 9 - Fifteen-lead motor
ncy 10
Figure 10 - Basic elements of any motor circuit
ncy 11
Figure 11 - Typical motor control center
ncy 12
Figure 12 - Sizing motor branch circuits
ncy 13
Figure 13 - Ratings of nontime-delay fuses for typical motor circuits
ncy 14
Figure 14 - Fuse application guidelines for motor branch circuits
ncy 15
Figure 15 - Determining running current with an ammeter
ncy 16
Figure 16 - Motor starting current characteristics
Transparency 17
National Center for Construction Education and Research
Figure 17 - Time-current characteristics of dual-element fuses and overload heaters
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
Transparency 18
National Center for Construction Education and Research
Figure 18 - Circuit components of a typical 10-horsepower motor
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
Transparency 19
National Center for Construction Education and Research
Figure 19 - Combination motor starter with magnetic-only circuit breakers
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
Transparency 20
National Center for Construction Education and Research
Figure 20 - Typical 30-horsepower Design B energy efficient motor circuit
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
Transparency 21
National Center for Construction Education and Research
Figure 21 - Several motors on one branch circuit
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
Transparency 22
National Center for Construction Education and Research
Figure 22 - Several smaller motors supplied by one branch circuit
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
Transparency 23
National Center for Construction Education and Research
Figure 23 - Placement of capacitors in a motor circuit
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
Supplemental Art
National Center for Construction Education and Research
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
National Center for Construction Education and Research
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
Figure 1 - Basic parts of a three-phase motor
National Center for Construction Education and Research
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
Think about it - Overload Protection
National Center for Construction Education and Research
Electrical Level Three Module 26309-05
Copyright © 2005 by NCCER, Published by Pearson Education, Inc.
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