SECTION 11338 MOTORS
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Single phase electric motors.
B. Three phase electric motors.
1.2 REFERENCES
A. AFBMA 9 - Load Ratings and Fatigue Life for Ball Bearings.
B. AFBMA 11 - Load Ratings and Fatigue Life for Roller Bearings.
C. ANSI/IEEE 112 - Test Procedure for Polyphase Induction Motors and Generators.
D. ANSI/NEMA MG 1 - Motors and Generators.
E. ANSI/NFPA 70 - National Electrical Code.
F. EISA – Energy Independence and Security Act of 2007.
1.3 SUBMITTALS
A. Submit product data under provisions of Division 1.
B. Submit test results verifying nominal efficiency and power factor for three phase motors larger than 5 horsepower.
C. Submit manufacturer's installation instructions under provisions of Division 1.
1.4 OPERATION AND MAINTENANCE DATA
A. Submit operation and maintenance data under provisions of Division 1.
B. Include assembly drawings, bearing data including replacement sizes, and lubrication instructions.
1.5 QUALIFICATIONS
A. Manufacturer: Company specializing in manufacture of electric motors for General use, and their accessories, with minimum three years documented product development, testing, and manufacturing experience.
1.6 REGULATORY REQUIREMENTS
A. ANSI/NFPA MG 1.
B. EISA.
1.7 DELIVERY, STORAGE, AND HANDLING
A. Deliver products to site under provisions of Division 1.
B. Store and protect products under provisions of Division 1.
C. Protect motors stored on site from weather and moisture by maintaining factory covers and suitable weather-proof covering. For extended outdoor storage, remove motors from equipment and store separately.
1.8 WARRANTY
A. Provide manufacturer's warranty under provisions of Division 1.
PART 2 PRODUCTS
2.1 MANUFACTURERS
A. Marathon.
B. U.S. Motors.
C. Westinghouse/TECO
D. General Electric.
E. Or Equal.
F. Substitutions: Under provisions of Division 1.
2.2 GENERAL CONSTRUCTION AND REQUIREMENTS
A. Electrical Service: Refer to Division 16 for required electrical characteristics.
B. Motors: Design for continuous operation in 40 degrees C environment, and for temperature rise in accordance with ANSI/NEMA MG 1 limits for insulation class, Service Factor, and motor enclosure type.
C. Explosion-Proof Motors: UL approved and labeled for hazard classification, with over temperature protection.
D. Visible Nameplate: Indicating motor horsepower, voltage, phase, cycles, RPM, full load amps, locked rotor amps, frame size, manufacturer's name and model number, Service Factor, Power Factor, efficiency.
E. Electrical Connection: Conduit connection boxes, threaded for conduit. For fractional horsepower motors where connection is made directly, provide [screwed] conduit connection in end frame.
2.3 SINGLE PHASE POWER - SPLIT PHASE MOTORS
A. Starting Torque: Less than 150 percent of full load torque.
B. Starting Current: Up to seven times full load current.
C. Breakdown Torque: Approximately 200 percent of full load torque.
D. Drip-proof Enclosure: Class A (50 degrees C temperature rise) insulation, NEMA Service Factor, prelubricated sleeve or ball bearings.
E. Enclosed Motors: Class A (50 degrees C temperature rise) insulation, 1.0 Service Factor, prelubricated ball bearings.
2.4 SINGLE PHASE POWER - PERMANENT-SPLIT CAPACITOR MOTORS
A. Starting Torque: Exceeding one fourth of full load torque.
B. Starting Current: Up to six times full load current.
C. Multiple Speed: Through tapped windings.
D. Open Drip-proof or Enclosed Air Over Enclosure: Class A (50 degrees C temperature rise) insulation, minimum 1.0 Service Factor, prelubricated sleeve or ball bearings, automatic reset overload protector.
2.5 SINGLE PHASE POWER - CAPACITOR START MOTORS
A. Starting Torque: Three times full load torque.
B. Starting Current: Less than five times full load current.
C. Pull-up Torque: Up to 350 percent of full load torque.
D. Breakdown Torque: Approximately 250 percent of full load torque.
E. Motors: Capacitor in series with starting winding; capacitor-start/capacitor-run motors shall have two capacitors in parallel with run capacitor remaining in circuit at operating speeds.
F. Drip-proof Enclosure: Class A (50 degrees C temperature rise) insulation, NEMA Service Factor, prelubricated ball bearings.
G. Enclosed Motors: Class A (50 degrees C temperature rise) insulation, 1.0 Service Factor, prelubricated ball bearings.
2.6 THREE PHASE POWER - SQUIRREL CAGE MOTORS
A. Starting Torque: Between one and one and one-half times full load torque.
B. Starting Current: Six times full load current.
C. Power Output, Locked Rotor Torque, Breakdown or Pullout Torque: NEMA Design B characteristics.
D. Design, Construction, Testing, and Performance: Conform to ANSI/NEMA MG 1 for Design B motors.
E. Insulation System: NEMA Class B or better.
F. Testing Procedure: In accordance with ANSI/IEEE 112, Test Method B. Load test motors to determine freedom from electrical or mechanical defects and compliance with performance data.
G. Motor Frames: NEMA standard T-frames of steel, aluminum, or cast iron with end brackets of cast iron or aluminum with steel inserts.
H. Thermostat System (for all motors operated by VFD): Three thermostats imbedded in motor windings and epoxy encapsulated. Series connected with wires brought to a motor terminal box. This terminal box shall be a separate box; not shared with the motor’s power terminal box.
I. Bearings: Grease lubricated anti-friction ball bearings with housings equipped with plugged provision for relubrication, rated for minimum AFBMA 9, L-10 life of 20,000 hours. Calculate bearing load with NEMA minimum V-belt pulley with belt center line at end of NEMA standard shaft extension. Stamp bearing sizes on nameplate.
J. Sound Power Levels: To ANSI/NEMA MG 1.
K. Weatherproof Epoxy Sealed Motors (Where Indicated): Epoxy coat windings with rotor and starter surfaces protected with epoxy enamel. Bearings shall be double shielded with waterproof non-washing grease.
L. Nominal Efficiency: Meet or exceed values in Schedules at full load and rated voltage when tested in accordance with ANSI/IEEE 112. Motors manufactured January 2011 or later shall conform to EISA (Premium Efficiency Levels) listed in paragraphs 3.12 and 3.13.
M. Nominal Power Factor: Meet or exceed values in Schedules at full load and rated voltage when tested in accordance with ANSI/IEEE 112.
PART 3 EXECUTION
3.1 APPLICATION
A. Motors drawing less than 250 Watts and intended for intermittent service may be germaine to equipment manufacturer and need not conform to these specifications.
B. Motors shall be open drip-proof (ODP) for non-process applications, except where specifically noted otherwise. Motors on process equipment specified in Division 11 shall be totally-enclosed fan cooled (TEFC), except where specifically noted otherwise.
C. Motors with frame sizes 254T and larger shall be energy efficient type.
D. Single phase motors for shaft mounted fans shall be split phase type.
E. Single phase motors for shaft mounted fans or blowers shall be permanent split capacitor type.
F. Single phase motors for fans shall be capacitor start type.
G. Motors located in exterior locations shall be weatherproof epoxy-treated type.
3.2 NEMA OPEN MOTOR SERVICE FACTORS
HP 3600 RPM 1800 RPM 1200 RPM 900 RPM 1/6 - 1/3 1.35 1.35 1.35 1.35
1/2 1.25 1.25 1.25 1.15
3/4 1.25 1.25 1.15 1.15
1 1.25 1.15 1.15 1.15
1.5 - 150 1.15 1.15 1.15 1.15
3.3 PERFORMANCE SCHEDULE: SINGLE PHASE – OPEN, DRIP-PROOF
HP RPM
(Syn)
Efficiency (%)
Power Factor (%)
1-1/2 1200 67 60
2 1200 68 65
3 1200 75 80
1/8 1800
1/6 1800 49 58
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
1/4
1800
52
1/3
1800
56
55
1/2
1800
64
65
3/4
1800
63
64
1
1800
68
72
1-1/2
1800
70
64
2
1800
73
72
3
1800
78
78
5
1800
74
76
7-1/2
1800
77
85
10
1800
84
90
1/3
3600
55
68
1/2
3600
57
71
3/4
3600
62
75
1
3600
63
69
1-1/2
3600
68
77
2
3600
71
75
3
3600
76
88
5
3600
76
88
7-1/2
3600
81
82
10
3600
83
86
3.4 PERFORMANCE SCHEDULE: SINGLE PHASE – TOTALLY ENCLOSED, FAN COOLED
HP RPM
(Syn)
Efficiency (%)
Power Factor (%)
1/6 1200 41 48
1/4 1200 44 50
1/3 1200 57 56
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
1/2
1200
59
63
3/4
1200
68
68
1
1200
67
67
1-1/2
1200
71
69
2
1200
82
84
3
1200
80
82
5
1200
1/12
1800
1/8
1800
47
55
1/6
1800
49
58
1/4
1800
53
52
1/3
1800
56
55
1/2
1800
63
67
3/4
1800
66
68
1
1800
68
72
1-1/2
1800
73
77
2
1800
75
81
3
1800
78
87
5
1800
82
87
7-1/2
1800
84
10
1800
1/8
3600
55
68
1/6
3600
57
1/4
3600
66
1/3
3600
70
1/2
3600
57
71
3/4
3600
66
74
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
1
3600
66
81
1-1/2
3600
70
82
2
3600
74
78
3
3600
76
87
5
3600
84
96
7-1/2
3600
82
89
10
3600
86
98
3.5 PERFORMANCE SCHEDULE: SINGLE PHASE – EXPLOSION PROOF
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
1/3
1200
54
56
½
1200
59
63
3/4
1200
65
67
1
1200
67
67
1-1/2
1200
71
69
1/3
1800
56
58
1/2
1800
65
65
3/4
1800
66
68
1
1800
66
67
1-1/2
1800
70
70
2
1800
75
81
3
1800
79
77
5
1800
74
81
1/2
3600
55
69
3/4
3600
62
75
1
3600
66
81
1-1/2
3600
70
82
HP RPM
(Syn)
Efficiency (%)
Power Factor (%)
2 3600 74 82
3 3600 76 87
3.6 PERFORMANCE SCHEDULE: THREE PHASE – OPEN, DRIP-PROOF (applies to U-frame, close-coupled pumps, footless, and vertical-shaft motors only)
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
1/2
900
71
57
3/4
900
74
56
1
900
71
66
1-1/2
900
74
67
2
900
73
63
3
900
76
60
5
900
80
60
7-1/2
900
85
62
1/4
1200
1/3
1200
1/2
1200
71
58
3/4
1200
77
67
1
1200
77
69
1-1/2
1200
78
77
2
1200
78
72
3
1200
79
72
5
1200
83
76
7-1/2
1200
85
78
10
1200
86
78
15
1200
87
82
20
1200
87
81
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
25
1200
88
84
30
1200
88
80
40
1200
89
85
50
1200
90
87
60
1200
90
82
75
1200
90
83
100
1200
91
85
125
1200
92
85
150
1200
91
84
200
1200
93
250
1200
93
1/4
1800
1/3
1800
1/2
1800
74
63
3/4
1800
74
60
1
1800
75
64
1-1/2
1800
79
69
2
1800
80
70
3
1800
81
77
5
1800
84
82
7-1/2
1800
86
76
10
1800
87
78
15
1800
87
77
20
1800
89
86
25
1800
89
83
30
1800
90
86
40
1800
91
85
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
50
1800
91
85
60
1800
90
83
75
1800
90
86
100
1800
91
86
125
1800
92
86
150
1800
92
88
200
1800
92
89
250
1800
92
90
1/3
3600
1/2
3600
74
63
3/4
3600
75
73
1/2
3600
67
63
1
3600
75
64
1-1/2
3600
78
82
2
3600
80
86
3
3600
81
84
5
3600
81
88
7-1/2
3600
84
85
10
3600
87
89
15
3600
87
91
20
3600
89
86
25
3600
89
87
30
3600
87
87
40
3600
90
87
50
3600
88
89
60
3600
90
88
75
3600
90
84
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
100
3600
93
83
125
3600
89
88
150
3600
90
89
200
3600
91
89
250
3600
92
90
3.7 PERFORMANCE SCHEDULE: THREE PHASE – EXPLOSION PROOF
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
1/3
1200
1/2
1200
71
58
3/4
1200
72
70
1
1200
82.5
69
1-1/2
1200
87.5
77
2
1200
88.5
68
3
1200
89.5
75
5
1200
89.5
7-1/2
1200
91
10
1200
91
15
1200
91.7
1/3
1800
1/2
1800
74
60
3/4
1800
76
69
1
1800
85.5
74
1-1/2
1800
86.5
80
2
1800
86.5
80
3
1800
89.5
75
5
1800
89.5
80
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
7-1/2
1800
91.7
82
10
1800
91.5
82
15
1800
92.4
82
20
1800
93
84
25
1800
93.6
86
30
1800
93.6
87
40
1800
94.1
88
50
1800
94.5
86
60
1800
95
75
1800
95.4
100
1800
95.4
1/2
3600
68
77
3/4
3600
72
79
1
3600
77
79
1-1/2
3600
84
80
2
3600
85.5
89
3
3600
86.5
87
5
3600
88.5
94
7-1/2
3600
89.5
90
10
3600
90.2
92
15
3600
91
85
20
3600
91
25
3600
91.7
30
3600
91.7
40
3600
92.4
50
3600
93
3.8 PERFORMANCE SCHEDULE: THREE PHASE – TWO SPEED, ONE WINDING, OPEN, DRIP-PROOF, VARIABLE TORQUE
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
1/
1800/
80/
75/
0.25
900
86
49
1.5/
1800/
77/
81/
0.37
900
61
58
2/
1800/
77/
85/
0.5
900
60
67
3/
1800/
81/
83/
0.75
900
71
60
5/
1800/
81/
84/
1.2
900
61
65
7.5/
1800/
83/
82/
1.9
900
75
65
10/
1800/
83/
87/
2.5
900
76
66
15/
1800/
3.7
900
20/
1800/
5
900
25/
1800/
6.3
900
3.9 PERFORMANCE SCHEDULE: THEEE PHASE – TWO SPEED, ONE WINDING, TOTALLY ENCLOSED, FAN COOLED, CONSTANT TORQUE
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
1/
1800/
77/
80/
0.5
900
59
48
1.5/
1800/
76/
85/
0.75
900
61
50
2/
1800/
75/
86/
1
900
64
52
HP RPM
(Syn)
Efficiency (%)
Power Factor (%)
3/
1.5
1800/
900
80/
66
85/
48
5/
2.5
1800/
900
83/
69
82/
48
7.5/
3.75
1800/
900
10/
5
1800/
900
15/
7.5
1800/
900
25/
13
1800/
900
25/
6.3
1800/
900
3.10 PERFORMANCE SCHEDULE: THREE PHASE – TWO SPEED, TWO WINDING, OPEN, DRIP-PROOF, CONSTANT TORQUE
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
1/
1800/
77/
80/
0.44
900
59
48
1.5/
1800/
76/
85/
0.7
900
61
50
2/
1800/
75/
86/
0.9
900
64
52
3/
1800/
80/
85/
1.3
900
66
48
5/
1800/
83/
82/
2.2
900
69
48
7.5/
1800/
3.3
900
10/
1800/
4.4
900
HP RPM
(Syn)
Efficiency (%)
Power Factor (%)
15/
6.7
1800/
900
20/
8.9
1800/
900
25/
8.9
1800/
900
25/
11
1800/
900
3.11 PERFORMANCE SCHEDULE: THREE PHASE – PREMIUM EFFICIENCY, OPEN, DRIP- PROOF
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
1
1200
82.5
72
1-1/2
1200
86.5
73
2
1200
87.5
75
3
1200
88.5
60
5
1200
89.5
65
7-1/2
1200
90.2
73
10
1200
91.7
74
15
1200
91.7
77
20
1200
92.4
78
25
1200
93.0
74
30
1200
93.6
78
40
1200
94.1
77
50
1200
94.1
79
60
1200
94.5
82
75
1200
94.5
80
100
1200
95.0
80
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
125
1200
95.0
84
1
1800
85.5
84
1-1/2
1800
86.5
85
2
1800
86.5
85
3
1800
89.5
86
5
1800
89.5
87
7-1/2
1800
91.0
86
10
1800
91.7
85
15
1800
93.0
85
20
1800
93.0
86
25
1800
93.6
85
30
1800
94.1
88
40
1800
94.1
83
50
1800
94.5
85
60
1800
95.0
88
75
1800
95.0
88
100
1800
95.4
83
125
1800
93.0
86
150
1800
93.0
85
200
1800
95.0
85
1-1/2
3600
84.0
85
2
3600
85.5
87
3
3600
85.5
85
5
3600
86.5
86
7-1/2
3600
88.5
88
10
3600
89.5
86
15
3600
90.2
89
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
20
3600
91.0
89
25
3600
91.7
92
30
3600
91.7
91
40
3600
92.4
92
50
3600
93
89
60
3600
93.6
91
75
3600
93.6
88
100
3600
93.6
88
150
3600
94.1
88
200
3600
95.0
88
3.12 PERFORMANCE SCHEDULE: THREE PHASE – PREMIUM EFFICIENCY, TOTALLY ENCLOSED, FAN COOLED
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
1
1200
82.5
72
1-1/2
1200
87.5
65
2
1200
88.5
68
3
1200
89.5
63
5
1200
89.5
66
7-1/2
1200
91.0
68
10
1200
91.0
75
15
1200
91.7
72
20
1200
91.7
76
25
1200
93.0
71
30
1200
93.0
79
40
1200
94.1
78
50
1200
94.1
81
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
60
1200
94.5
83
75
1200
94.5
80
100
1200
95.0
83
125
1200
95.0
85
1
1800
85.5
71
1-1/2
1800
86.5
85
2
1800
86.5
85
3
1800
89.5
83
5
1800
89.5
83
7-1/2
1800
91.7
85
10
1800
91.7
84
15
1800
92.4
86
20
1800
93.0
85
25
1800
93.6
84
30
1800
93.6
86
40
1800
94.1
83
50
1800
94.5
85
60
1800
95.0
87
75
1800
95.4
87
100
1800
95.4
86
125
1800
95.4
87
150
1800
95.8
88
200
1800
96.2
87
250
1800
96.2
89
1-1/2
3600
84.0
85
2
3600
85.5
87
3
3600
86.5
87
HP
RPM
(Syn)
Efficiency (%)
Power Factor (%)
5
3600
88.5
88
7-1/2
3600
89.5
86
10
3600
90.2
86
15
3600
91.0
91
20
3600
91.0
89
25
3600
91.7
92
30
3600
91.7
92
40
3600
92.4
91
50
3600
93.0
92
60
3600
93.6
93
75
3600
93.6
91
100
3600
94.1
92
END OF SECTION
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