B.3.18 ELECTRICAL REQUIREMENTS
electric Motors Specification
Motors efficiencies. Efficiencies are classified by the National Electrical Manufacturer’s Association,
(NEMA) as “energy efficient”. NEMA minimum specifications are listed in the following tables:
FULL LOAD EFFICIENCIES
Single Speed Polyphase Squirrel-Cage Induction Motors Having Synchronous Speeds of 3600, 1200, and 900 rpm |
OPEN MOTORS |
HP |
2 POLE |
4 POLE |
6 POLE |
8 POLE |
|
Nominal Efficiency |
Minimum Efficiency |
Nominal Efficiency |
Minimum Efficiency |
Nominal Efficiency |
Minimum Efficiency |
Nominal Efficiency |
Minimum Efficiency |
1.0 |
--- |
--- |
82.5 |
81.5 |
80.0 |
78.5 |
74.0 |
72.0 |
1.5 |
82.5 |
81.5 |
84.0 |
82.5 |
84.0 |
82.5 |
75.5 |
74.0 |
2.0 |
84.0 |
82.5 |
84.0 |
82.5 |
85.5 |
84.0 |
85.5 |
84.0 |
3.0 |
84.0 |
82.5 |
86.5 |
85.5 |
86.5 |
85.5 |
86.5 |
85.5 |
5.0 |
85.5 |
84.0 |
87.5 |
86.5 |
87.5 |
86.5 |
87.5 |
86.0 |
7.5 |
87.5 |
86.5 |
88.5 |
87.5 |
88.5 |
87.5 |
88.5 |
87.5 |
10.0 |
88.5 |
87.5 |
89.5 |
88.5 |
90.2 |
89.5 |
89.5 |
88.5 |
15.0 |
89.5 |
88.5 |
91.0 |
90.2 |
90.2 |
89.5 |
89.5 |
88.5 |
20.0 |
90.2 |
89.5 |
91.0 |
90.2 |
91.0 |
90.2 |
90.2 |
89.5 |
25.0 |
91.0 |
90.2 |
91.7 |
91.0 |
91.7 |
91.0 |
90.2 |
89.5 |
30.0 |
91.0 |
90.2 |
92.4 |
91.7 |
92.4 |
91.7 |
91.0 |
90.2 |
40.0 |
91.7 |
91.0 |
93.0 |
92.4 |
93.0 |
92.4 |
91.0 |
90.2 |
50.0 |
92.4 |
91.7 |
93.0 |
92.4 |
93.0 |
92.4 |
91.7 |
91.0 |
60.0 |
93.0 |
92.4 |
93.6 |
93.0 |
93.6 |
93.0 |
92.4 |
91.7 |
75.0 |
93.0 |
92.4 |
94.1 |
93.6 |
93.6 |
93.0 |
93.6 |
93.0 |
100.0 |
93.0 |
92.4 |
94.1 |
93.6 |
94.1 |
93.6 |
93.6 |
93.0 |
125.0 |
93.6 |
93.0 |
94.5 |
94.1 |
94.1 |
93.6 |
93.6 |
93.0 |
150.0 |
93.6 |
93.0 |
95.0 |
94.5 |
94.5 |
94.1 |
93.6 |
93.0 |
200.0 |
94.5 |
94.1 |
95.0 |
94.5 |
94.5 |
94.1 |
93.6 |
93.0 |
FULL LOAD EFFICIENCIES
Single Speed Polyphase Squirrel-Cage Induction Motors Having Synchronous Speeds of 3600, 1200, and 900 rpm |
HP |
2 POLE |
4 POLE |
6 POLE |
8 POLE |
|
Nominal Efficiency |
Minimum Efficiency |
Nominal Efficiency |
Minimum Efficiency |
Nominal Efficiency |
Minimum Efficiency |
Nominal Efficiency |
Minimum Efficiency |
1.0 |
75.5 |
74.0 |
82.5 |
81.5 |
80.0 |
78.5 |
74.0 |
72.0 |
1.5 |
82.5 |
81.5 |
84.0 |
82.5 |
85.5 |
84.0 |
77.0 |
75.5 |
2.0 |
84.0 |
82.5 |
84.0 |
82.5 |
86.5 |
85.5 |
82.5 |
81.5 |
3.0 |
85.5 |
84.0 |
87.5 |
86.5 |
87.5 |
86.5 |
84.0 |
82.5 |
5.0 |
87.5 |
86.5 |
87.5 |
86.5 |
87.5 |
86.5 |
85.5 |
84.0 |
7.5 |
88.5 |
87.5 |
89.5 |
88.5 |
89.5 |
88.5 |
85.5 |
84.0 |
10.0 |
89.5 |
88.5 |
89.5 |
88.5 |
89.5 |
88.5 |
88.5 |
87.5 |
15.0 |
90.2 |
89.5 |
91.0 |
90.2 |
90.2 |
89.5 |
88.5 |
87.5 |
20.0 |
90.2 |
89.5 |
91.0 |
90.2 |
90.2 |
89.5 |
89.5 |
88.5 |
25.0 |
91.0 |
90.2 |
92.4 |
91.7 |
91.7 |
91.0 |
89.5 |
88.5 |
30.0 |
91.0 |
90.2 |
92.4 |
91.7 |
91.7 |
91.0 |
91.0 |
90.2 |
40.0 |
91.7 |
91.0 |
93.0 |
92.4 |
93.0 |
92.4 |
91.0 |
90.2 |
50.0 |
92.4 |
91.7 |
93.0 |
92.4 |
93.0 |
92.4 |
91.7 |
91.0 |
60.0 |
93.0 |
92.4 |
93.6 |
93.0 |
93.6 |
93.0 |
91.7 |
91.0 |
75.0 |
93.0 |
92.4 |
94.1 |
93.6 |
93.6 |
93.0 |
93.0 |
92.4 |
100.0 |
93.6 |
93.0 |
94.5 |
94.1 |
94.1 |
93.6 |
93.0 |
92.4 |
125.0 |
94.5 |
94.1 |
94.5 |
94.1 |
94.1 |
93.6 |
93.6 |
93.0 |
150.0 |
94.5 |
94.1 |
95.0 |
94.5 |
95.0 |
94.5 |
93.6 |
93.0 |
200.0 |
95.0 |
94.5 |
95.0 |
94.5 |
95.0 |
94.5 |
94.1 |
93.6 |
Motor Sizing. Motor horsepower ratings shall not exceed the calculated maximum load served by more than 25%. If a standard rated motor is not available within the desired range, the next larger standard size may be used.
Energy-efficient lighting guidelines:
Light levels: 30 fc in administrative areas, 10 fc in hallways.
Lighting power densities shall not exceed 1.5 W/sf, with goal of less than 1 Wlsf.
Design lighting with separate on-off switching for each zone within a space.
Install occupancy sensors in hallway, latrines, classrooms, and meeting rooms.
Take advantage of daylighting potential.
Where daylighting is used, provide photosensors for electric lighting control.
Electronic Ballasts Specifications:
UL listed Class P.
Sound Rated A.
Total Harmonic Distortion greater than or equal to IO%, third harmonic distortion less than 6%.
Power factor must be greater than or equal to 95%.
Ballast factor must be greater than or equal to 0.88.
Lamp current crest factor less than or equal to 1.7.
Flicker 5% or less with any lamp suitable for ballast.
Minimum 5 year warranty.
Fluorescent Lamp Specifications:
In general, lamps shall be 265 mA "t-8" rapid start type as follows:
2' lamps shall be 17 watt F17T8.
3' lamps shall be 25 watt F25T8.
4' lamps shall be 32 watt F32T8.
5' lamps shall be 40 watt F4OT8.
1'MOL U-Iamps shall be 16 watt FB16TS.
1.5'MOL U-Iamps shall be 24 watt FB24T8.
2'MOL U-Iamps shall be 31 watt FB31 TS.
Color: Lamps shall be 3500 Kelvin correlated temperature.
Color Rendering Index: Lamps shall have a minimum CRI of 80 through the use of rare earth phosphor coatings.
Compact Fluorescent Lamp/Ballast Specifications:
Color Rendering Index: Lamps shall have a rninimurn CRI of 80 through the use of rare earth phosphor coatings.
Color: Lamps shall be of 2700, 3000, 3500, or 5000 Kelvin correlated temperature.
Lamp efficacy must be at least 50 lumens/waft.
Ballast must be of High Power Factor (HPF) type, capable of increasing power factor to 90%.
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