Eaton EGSX 50L12, 50L12R, 100A, 100NSEA, 100L24RA, 150NSEA, 200A, 200NSEA, 400NSEA, EGSU 100ACA, 100NSEACA, 100L24RACA, 150NSEACA, 200ACA, 200NSEACA, 400NSEACA, ATC, ATV, ATH Generator Sizing guide
Below you will find brief information for Generator EGSX 50L12, Generator EGSX 50L12R, Generator EGSX 100A, Generator EGSX 100NSEA, Generator EGSX 100L24RA, Generator EGSU 100ACA, Generator EGSU 100NSEACA, Generator EGSU 100L24RACA, Generator EGSX 150NSEA, Generator EGSU 150NSEACA.
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Technical Data TD00405018E
Effective April 2017
Supersedes August 2009
Generator sizing guide
Contents
Description Page
Technical Data TD00405018E
Effective April 2017
Generator sizing guide
Important notice
This booklet is designed to familiarize estimators and installers with proper sizing guidelines for residential and commercial generators.
The information is not comprehensive, nor does it replace or supersede any material contained in any of the written documents shipped with the equipment. This booklet should only be used in conjunction with the Owner’s Manual, Installation Manual, and other technical documents shipped with each product. Always read all accompanying documentation carefully before attempting to install any generator, transfer switch, or related equipment.
How to use this booklet
Within this booklet, you will find electrical load information, plus an outline of generator surge capability, fuel pipe sizing, liquid propane tank sizing, and UPS/generator compatibility. The worksheet pages can be removed from the book and photocopied to create additional
On-site Estimating Sheets for use with individual jobs.
Safety information
Proper sizing of the generator is crucial to the success of any installation and requires a good working knowledge of electricity and its characteristics, as well as the varying requirements of the electrical equipment comprising the load. When analyzing the electrical load, consult the manufacturer’s nameplate on each major appliance or piece of equipment to determine its starting and running requirements in terms of watts, amps, and voltage.
When choosing the generator output for commercial or industrial applications, select a rating that is approximately 20 to 25% higher than the peak load (for example, if the load is about 40 kilowatts, select a 50 kW genset). A higher rated generator will operate comfortably at approximately 80% of its full capacity and will provide a margin of flexibility if the load increases in the future.
For safety reasons, Eaton recommends that the backup power system be installed, serviced, and repaired by an Eaton Authorized Service
Dealer or a competent, qualified electrician or installation technician who is familiar with applicable codes, standards, and regulations.
It is essential to comply with all regulations established by the
Occupational Safety & Health Administration (OSHA) and strict adherence to all local, state, and national codes is mandatory.
Before selecting a generator, check for municipal ordinances that may dictate requirements regarding placement of the unit (setback from building and/or lot line), electrical wiring, gas piping, fuel storage
(for liquid propane or diesel tanks), sound and exhaust emissions.
If you have a technical question regarding sizing or installation, contact EatonCare’s Technical Resource Center toll free at
1-877-386-2273, option 2 during normal business hours
(8 a.m. to 4 p.m. CST).
2
EATON www.eaton.com
Generator sizing guide Technical Data TD00405018E
Effective April 2017
Table 1. Motor load reference
ac and heat pumps
Description
1 ton (12,000 BTU)
2 ton (24,000 BTU)
3 ton (36,000 BTU)
4 ton (48,000 BTU)
5 ton (60,000 BTU)
hp
1
2
3
4
5
7.5 ton (85,000 BTU) 7.5
5 (x2)
10 ton (120,000 BTU) 10
7.5 (x2) 15
15 ton (180,000 BTU) 15 15
10 (x2) 20
7.5
10
10
3
4
5
1
2
Running load
Single-phase Three-phase
Running kW
Amps at
240 V
Amps at
208 V
Amps at
240 V
5
10
3
7
3
6
15
20
25
37
49
49
74
74
98
10
13
16
24
33
33
49
49
65
8
11
14
21
28
28
42
42
57
20 ton (240,000 BTU)
25 ton (300,000 BTU)
20
25
30 ton (360,000 BTU)
15 (x2)
30 ton (360,000 BTU) 30
20 (x2)
40 ton (480,000 BTU) 40
50 ton (480,000 BTU)
25 (x2)
50 ton (480,000 BTU)
General residential
50
20
25
30
30
40
40
50
50
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
65
82
98
98
131
131
163
163
57
71
85
85
113
113
142
142
Single-phase
Running kW
0.5
Amps at 120 V
4.9
4.9 amps at 240 V
2.5
Description
Refrigerator pump, sump, furnace, garage opener
hp
0.5
Freezer, washer, septic grinder
0.75
General 1 hp 1
Well and septic lift pump 2
0.75
1
2
7.4
9.8
19.6
3.7
4.9
9.8
a
For multiple motor configurations, sequence starting is assumed.
28
35
42
21
21
28
42
57
57
71
71
11
14
14
4
6
7
1
3
Amps at
480 V
219
375
250
500
625
375
750
500
1000
625
1250
100
117
145
219
145
250
Starting load
Single-phase Three-phase
LR amps at 240 V
LR amps at 208 V
LR amps at 240 V
33
67
22
44
19
38
67
78
97
146
97
167
58
67
84
126
84
144
146
250
167
333
416
250
500
333
666
416
833
126
217
144
289
361
217
433
289
577
361
722
63
108
72
144
180
108
217
144
289
180
361
63
42
72
29
34
42
LR amps at 480 V
10
19
17
30
20
17
12.5
20
kW
2.5
5
7.5
10
12.5
40
50
30
60
40
80
50
100
Single-phase
LR amps at 240 V
13
19
25
50
LR amps at 120 V
25
38
50
100
kW
1.5
2.3
3
6
m CAUTION
DO NOT SIZE THE GENERATOR BASED ON STARTING KW ALONE.YOU
MUST COMPARE LR AMPS TO GENERATOR SURGE CAPABILITY (TABLE 3).
SIZE THE GENERATOR BY FOLLOWING THE SIZING INSTRUCTIONS.
EATON www.eaton.com
3
Technical Data TD00405018E
Effective April 2017
Table 2. Non-motor load reference
Residential
Description
Single-phase
Running kW
Amps at
120 V
Amps at
240 V
Electric heat per 1000 ft
2
Heat pump elements per 1000 ft 2
Dryer
Hot tub
Range oven/stove top per burner
Hot water
General lighting and receptacles per 1000 ft
2
12
7
5.5
10
8
4.5
3
N/A
N/A
N/A
N/A
N/A
N/A
24.9
50
29
23
50
30
19
N/A
Blow dryer
Dishwasher
Microwave
Toasters
1.25
1.5
1
1
10.4
12.5
8.3
8.3
N/A
N/A
N/A
N/A
Home entertainment center
Computer
Kitchen
1
1
8.3
8.3
N/A
N/A
Laundry
Commercial
1.5
1.5
12.5
12.5
N/A
N/A
Please refer to equipment data plate and/or billing history for commercial details.
a
Always check data plate for actual running amps.
Generator sizing guide
4
EATON www.eaton.com
Generator sizing guide Technical Data TD00405018E
Effective April 2017
35
45
60
70
80
100
150
17
18
20
25
30
8
10
13
14
16
35
36
40
22
25
27
30
45
48
70
80
Table 3. Surge capability
Generators (operating at less than 3600 RPM)
Rated output (running amps)
Size (kW)
Single-phase
240 V 208 V
Three-phase
240 V 480 V
7
92
104
113
125
146
150
167
188
200
292
333
29
76
87
94
104
121
125
139
156
167
243
278
N/A
N/A
75
81
90
105
108
120
135
144
210
240
100
130
417
542
347
451
Generators (operating at 3600 RPM)
300
390
N/A
52
54
60
N/A
38
41
45
68
72
105
120
150
195
N/A
33
42
54
58
67
71
75
83
104
125
146
188
250
292
333
417
625
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
87
104
121
156
208
243
278
347
520
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
75
90
105
135
180
210
240
300
451
N/A
N/A
N/A
38
45
N/A
N/A
N/A
N/A
N/A
52
68
90
105
120
150
226
Commercial (LR amps at 15% voltage dip)
Single-phase Three-phase
240 V 208 V 240 V 480 V
71
71
100
100
113
113
129
146
163
275
275
369
546
113
146
179
275
275
369
63
67
73
71
100
558
23
26
31
48
52
59
48
48
67
67
75
75
86
98
109
164
183
222
364
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
48
67
75
98
120
164
183
222
372
N/A
46
58
65
60
65
75
94
94
159
159
214
315
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
46
60
60
94
103
142
158
214
322
43
44
49
N/A
30
33
43
57
57
95
106
128
209
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
30
43
43
57
69
95
106
128
215
Residential (LR amps at 30% voltage dip)
Single-phase Three-phase
240 V 208 V 240 V 480 V
134
138
153
205
225
225
254
292
321
550
550
738
1088
46
51
63
95
102
117
125
133
145
138
205
225
292
350
550
550
738
1121
92
92
137
137
150
151
169
195
214
330
366
441
724
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
92
137
150
195
234
330
366
441
747
N/A
91
118
130
118
131
147
168
185
318
318
426
628
118
168
204
286
318
426
N/A
N/A
N/A
91
130
647
N/A
N/A
N/A
N/A
N/A
N/A
87
87
97
N/A
59
64
87
112
112
190
212
255
419
87
112
136
190
212
255
N/A
N/A
N/A
60
87
431
N/A
N/A
N/A
N/A
N/A
N/A
N otee:
All nominal ratings based upon LP fuel. Refer to specification sheet for NG ratings and deration adjustments for ambient temperature and altitude.
EATON www.eaton.com
5
Technical Data TD00405018E
Effective April 2017
70
80
100
130
150
20
22
25
27
30
Table 4. Fuel pipe sizing
Natural gas (values are maximum pipe run in ft) kW Pipe size (in inches)
0.75
1 1.25
7–8
10
55
20
200
85
820
370
10
22
25
27
13–14
16–17
20
50
40
20
15
10
245
190
130
115
95
85
45
48
50
30
35–36
40
60
35
25
15
60
70
80
100
130
150
LP vapor (values are maximum pipe run in ft) kW Pipe size (in inches)
0.75
1 1.25
7–8
10
13–14
16–17
165
70
45
25
570
255
170
130
1000
690
540
35–36
40
45
48
50
60
15 115
85
60
55
40
20
15
480
365
275
260
195
125
107
82
70
70
45
20
15
1.5
60
50
30
605
575
435
290
250
195
165
160
115
1.5
60
50
50
147
95
75
25
5
800
545
425
305
260
220
203
2 2.5
3
260
230
220
145
75
65
40
945
799
739
552
565
370
315
2
915
790
650
585
560
390
225
195
140
50
30
2.5
1185
710
630
460
215
150
3
1030
890
725
620
610
445
260
230
165
70
45
1095
660
590
430
205
150
1305
660
490
Generator sizing guide
LP
•
•
LPG: 8.55 ft
3
/lb, 4.24 lb/gal,
2500 btu/ft 3
LPG: 36.3 ft
3
= 1 gal
Natural gas
•
•
•
1 cubic foot = 1,000 BTU
1 therm = 100,000 BTU
Gas consumption = 13,000–
16,000 BTU per kW/hr
Pressure
•
•
•
1 inch mercury = 13.61 inches water column
1 inch water column =
0.036 psi
5–14 inches water column =
0.18 psi to 0.50 psi
Notee:
•
•
•
Pipe sizing is based on 0.5 in
H
2
O pressure drop
Sizing includes a nominal number of elbows and tees
Please verify adequate service and meter sizing
6
EATON www.eaton.com
Generator sizing guide Technical Data TD00405018E
Effective April 2017
Table 5. LP vapor (LPV) tank sizing
Vapor withdrawal (dimensions are given in inches)
Tank capacity total (gal)
Tank capacity useable (gal)
Minimum temp (°F)
120 72
150
250
325
500
850
1000
90
150
195
300
510
600
40
20
0
40
20
0
40
20
0
40
20
0
40
20
0
40
20
0
40
20
0
90
100
110
120
130
140
150
200
300
50
60
70
80
30
35
40
Load (kW)
5
10
15
20
25
BTU/hr
110,000
176,400
231,800
267,100
352,800
418,300
467,400
550,000
675,000
836,600
1,035,700
1,170,000
1,200,000
1,280,000
1,550,000
1,675,000
1,800,000
1,925,000
2,050,000
2,800,000
4,100,000
LP gal/hr
1.2
2
2.5
2.8
3.8
4.5
5.1
6.1
7.5
9
11
12.7
13
13.8
17.1
18.5
19.5
21.3
22.7
30.9
45.3
NG ft
3
/hr
110
156
220
262
316
417
485
550
675
862
1,020
1,154
1,200
1,260
1,550
1,675
1,786
1,925
2,050
2,800
4,100
N otee:
Operating cost per hour = NG therms/hr x cost of NG therms.
12.0
12.6
15.5
16.7
17.8
19.2
20.5
28.0
49.0
4.2
4.8
5.5
6.7
8.6
10.2
11.5
NG therms/hr
1.1
1.6
2.2
2.6
3.2
Tank capacity
(btu/hr)
246,240
164,160
82,080
293,760
195,840
97,920
507,600
338,400
169,200
642,600
428,400
214,200
792,540
528,360
264,180
1,217,700
811,800
405,900
1,416,960
944,640
472,320
Length
57
68
94
119
119
165
192
Diameter
24
24
30
30
37
41
41
Overall height
33
33
39
39
46
50
50
Gas required for common appliances
Appliance
Warm air furnace
Single family
Multifamily, per unit
Hydronic boiler, space heating
Single family
Multifamily, per unit
Hydronic boiler, space and water heating
Single family
Multifamily, per unit
Range, free standing, domestic
Built-in oven or broiler unit, domestic
Built-in top unit, domestic
Water heater, automatic storage, 30 to 40 gal. tank
Water heater, automatic storage, 50 gal. tank
Water healer, automatic storage, instantaneous
2 gpm
4 gpm
6 gpm
Water heater, domestic, circulating or side-arm
Refrigerator
Clothes dryer, Type 1 (domestic)
Gas fireplace direct vent
Gas log
Barbecue
Gas light
Incinerator, domestic
Approximate input (btu/hr)
100,000
60,000
100,000
60,000
120,000
75,000
65,000
25,000
40,000
35,000
50,000
142,800
285,000
428,000
35,000
3,000
35,000
40,000
80,000
40,000
2,500
35,000
N otee:
Tank BTU capacity and generator run times based upon maintaining a minimum tank fuel level of 20%. Tanks are typically filled to 80% full. Typical fuel consumption based on a generator 100% loaded.
EATON www.eaton.com
7
Technical Data TD00405018E
Effective April 2017
Generator sizing guide
UPS—generator compatibility
Passive (also referenced as standby or offline) and line-interactive
These technologies are most common for personal workstations and point-of-sale applications. They are typically single-phase equipment with size ranges of 350–2000 VA for passive and
500 VA to 5000 VA for line-interactive.
Passive UPSs are the simplest type. Under normal conditions, ac power passes straight through to the UPS load. When the input power supply goes outside of specifications, the UPS transfers the load from input power to the internal dc to ac power inverter.
Passive UPSs do not correct for voltage or frequency deviations under “normal” operation.
Line-interactive is similar to the passive technology except it has circuitry that attempts to correct for standard voltage deviations.
Frequency deviations under “normal” power operation are not corrected.
Equipment notes
These devices tend to be electrically/harmonically very noisy. A single small UPS is not a significant concern, but applications with multiple UPSs can be problematic.
Passive UPS technology typically has normal tolerances of 10–25% on voltage and 3 Hz on frequency. If the input source goes outside of these tolerances, the UPS will switch onto the UPS battery source. Some line-interactive units may have frequency tolerances factory set to 0.5 Hz. These units will need to have their frequency tolerance increased to a minimum of 2 Hz.
Generator sizing recommendation
•
Limit the total UPS loading to 15%–20% of the generator capacity
Double-conversion
This technology is most common for critical load applications.
Double-conversion UPSs constantly rectify ac to dc and then invert the dc back into ac. This configuration results in an output that corrects for voltage and frequency deviations.
There are single- and three-phase models covering small to large applications. Most UPS applications larger than 5000 VA use doubleconversion technology. This approach is also the preferred technology for generator applications.
Equipment notes
Double-conversion UPSs that are single-phase or unfiltered three-phase models tend to create a significant level of electrical/ harmonic noise. This is illustrated by harmonic current distortions that are greater than 35%. Minuteman UPS products could have current distortion of 8%. When three-phase models are supplied with harmonic filters (current distortion less than 10%), this concern is no longer an issue.
Generator sizing recommendations
•
•
•
•
Single-phase models: Limit the total UPS loading to 25% of the generator capacity
Single-phase Minuteman UPS models: Limit the total UPS loading to 50% of the generator capacity
Three-phase models without filters (current distortion > 30%):
Limit the UPS loading to 35% of the generator capacity
Three-phase models with filters (current distortion < 10%):
Limit the UPS loading to 80% of the generator capacity
Supplier(s)
Powerware
Minuteman UPS
APC
Liebert
Passive (standby)
3000 series
Enspire
Back-UPS Series
PowerSure PST & PSP
Line-interactive
5000 series
Enterprise Plus
Smart-UPS Series
PowerSure PSA & PSI
Double-conversion
9000 series
Endeavor
Symmetra Series
UPStation & Nfinity
8
EATON www.eaton.com
Generator sizing guide Technical Data TD00405018E
Effective April 2017
Table 6. Online estimating sheet
Contractor: ______________________________________________ Email: ____________________________________
Phone: (___) ________________ Fax: (___) _________________
Job name: __________________________________________________________________________________________
Date: ___ / ___ / __________ Location: _____________________________________________________________
Voltage
Type
Electric service
120/240 1 Ø
Natural gas
100 amp
120/208 3 Ø
LP vapor (LPV)
200 amp
120/240 3 Ø 277/480 3 Ø
400 amp 600 amp Other: _____________
N otee:
Before installation, contact local jurisdiction to confirm all requirements are met. Jurisdictions may vary.
Eaton recommends contacting local authorities prior to installation.
Loadse: Look for heavy building loads such as refrigeration, air conditioning, pumps or UPS systems.
Motor load table (refer to Table 1) Use the following for sizing and determining generator kW.
Device hp RA LRA kW running (= hp) Starting kW
Applications
The QT Series does not meet the necessary requirements for the following applications:
•
•
NEC 695 fire pumps
NEC 700 emergency systems
•
•
•
NFPA 20 fire pumps
NFPA 99 healthcare
NFPA 110 emergency systems
Reference codes
Related codes and standards:
•
NEC 225 branch circuits and feeders
•
•
NEC 240 overcurrent protection
NEC 250 grounding
•
•
•
NEC 445 generators
NEC 700 Emergency Systems
NEC 701 legally required standby
•
•
•
•
NEC 702 optional standby
NFPA 37 installation and use of stationary engines
NFPA 54 national fuel gas code
NFPA 58LP gas code
•
•
•
Starting kW for hp < 7.5 starting kW = hp x 3
Starting kW for hp > 7.5 starting kW = hp x 2
Starting kW for loading with no listed hp, calculate hp based on running amps in the chart on the right
Non-motor load table (refer to Table 2)
Use the following for sizing and determining generator kW.
Device Amps kW
Install notes
•
Suggested concrete pad minimum thickness of 4 inches with
6 inches overhang on all sides. Composite pad included with air-cooled products
•
•
Consult manual for installation recommendations
Consult local authority having jurisdiction for local requirements
Transfer switch availability
Service Entrance
Non-Service Entrance
Three-phase
Service Entrance
Non-Service Entrance
Amps
100, 200, 400, 600, 800
50, 100, 200, 400, 600, 800
100, 225, 300, 400, 600, 800
100, 200, 300, 400, 600, 800 a
Single-phase ATSs from 100 to 400 amps have intelligent load management standard.
To calculate kW
120 V, single-phase
240 V, single-phase
208 V, three-phase
240 V, three-phase
480 V, three-phase
Amps x 120/1000 = kW
Amps x 240/1000 = kW
(Amps x 208 x 1.732 x PF) /1000 = kW
(Amps x 240 x 1.732 x PF) /1000 = kW
(Amps x 480 x 1.732 x PF) /1000 = kW
Recommended generator size
Refer to “Generator sizing instructions” on other side of this sheet.
EATON www.eaton.com
9
Technical Data TD00405018E
Effective April 2017
Generator sizing guide
On-site estimating sheet
Generator sizing instructions
There is not a single correct sizing solution. Following are several methods that, when mixed with good judgement, should result in an appropriately sized generator. Remember to consider load growth, seasonality, and effects of starting motors.
Always check with the local inspection department to confirm which
NEC code cycle will affect your install.
Never add amps when sizing a generator. Convert amps to kW and add kW to determine the required generator size. Power factors for various motor loads vary widely. Adding amps without properly accounting for the power factor and/or mixing voltages will result in improperly sizing the generator.
When motors start, they create a current surge that step loads the generator and creates a voltage dip. After selecting a generator,
reference the generator’s surge capability using Table 3. Verify
that voltage dip is adequate for the application. Most commercial applications should be limited to about 15% voltage dip and residential applications should be limited to a 30% voltage dip.
Some applications utilize an uninterruptible power supply (UPS) to back up critical loads. Please read sizing guide for this load type.
Measurement method
Use a clamp-on amp meter or power analyzer to measure facility load levels. Clamp each leg separately and take the measurement during peak usage levels.
240 V, single-phase applicationse: To determine peak usage in kW,
add the highest amp readings from the two legs, multiply by 120 and divide by 1000.
(L1 + L2)120 / 1000
Size the generator 10 to 20% larger than the peak measured load.
Three-phase applicationse: Add the peak amp readings from all
three legs and divide by 3 to determine peak amps. Multiply peak amps by volts, multiply the result by 1.732 (square root of 3), and then divide by 1000 to convert amps to kW.
Peak Amps = (L1 + L2 + L3) / 3 kW = [(Peak Amps x Volts) x 1.732] / 1000 a a
Assumes power factor of 1.0
Size the generator 20 to 25% larger than the peak measured load.
Peak Amps = _____________ Peak kW= _____________
Project layout
Billing history method commercial
Many commercial customers have a utility rate structure that has a peak demand charge. Using a year’s worth of electric bills, size the generator 25% larger than the largest peak demand.
Verify motor and UPS load compatibility: Peak Demand = _______
Load summation method
•
•
•
Enter running kW for all motor loads (except the largest) expected
to run during peak load levels into Table 6. Refer to Table 1 for
typical motor load sizes and electrical requirements.
Enter kW for all non-motor loads expected to run during peak load
levels into Table 2. Refer to Table 2 for typical residential loads
and rules of thumb.
Add the running motor load kW, non-motor load kW, and the starting kW of the largest motor load.
Motor load running total (minus largest motor): ____________ kW
Non-motor load total: (ref. Table 2):
Starting load from largest cycling motor::
Total electrical loads: =
____________ kW
____________ kW
____________ kW
Select generator: Commercial (add 20 to 25% to total kW)
Residential (add 10 to 20% to total kW)
•
•
Confirm that voltage dip is within acceptable limits by comparing
motor LRA to generator surge capability (see Table 3)
Confirm UPS compatibility (see Table 4)
Ball park estimates (do not use for final sizing)
Estimate based on 60% service size: (commercial)
240 V, single-phase: __________ Amps x 0.15 = __________ kW
208 V, three-phase: ___________ Amps x 0.22 = __________ kW
240 V, three-phase: ___________ Amps x 0.25 = __________ kW
480 V, three-phase: ___________ Amps x 0.50 = __________ kW
Estimate based on 40% service size: (residential)
240 V, single-phase: __________ Amps x 0.10 = __________ kW
208 V, three-phase: ___________ Amps x 0.15 = __________ kW
240 V, three-phase: ___________ Amps x 0.17 = __________ kW
480 V, three-phase: ___________ Amps x 0.34 = __________ kW
Estimate based on square footage
Fast food, convenience stores, restaurants, grocery stores
Other commercial applications
Square footage = __________ kW = 50 kW + 10 watts/sq ft kW = 30 kW + 5 watts/sq ft
Estimated kW = __________
Amps to kW rule-of-thumb (assumes .8 pf)
For 480 V
For 208 V
Amps = kW x 1.5
Amps = kW x 3.5
For 240 V, three-phase systems Amps = kW x 3
For 240 V, single-phase systems Amps = kW x 4
10
EATON www.eaton.com
Generator sizing guide
Typical single-phase generator/transfer switch combinations
Air-cooled generators kW Transfer switch
9
11
16
20
EGSX50L12
EGSX50L12R
EGSX100A
EGSX100NSEA
EGSX100L24RA
EGSU100ACA
EGSU100NSEACA
EGSU100L24RACA
EGSX50L12
EGSX50L12R
EGSX100A
EGSX100NSEA
EGSX100L24RA
EGSU100ACA
EGSU100NSEACA
EGSU100L24RACA
EGSX100A
EGSX100NSEA
EGSX100L24RA
EGSX150NSEA
EGSU100ACA
EGSU100NSEACA
EGSU100L24RACA
EGSU150NSEACA
EGSU200ACA
EGSU200NSEACA
EGSX150NSEA
EGSX200A
EGSX200NSEA
EGSU150NSEACA
EGSU200ACA
EGSU200NSEACA
22
25
27
EGSX150NSEA
EGSX200A
EGSX200NSEA
EGSU150NSEACA
EGSU200ACA
EGSU200NSEACA
EGSX150NSEA
EGSX200A
EGSX200NSEA
EGSX400NSEA
EGSU150NSEACA
EGSU200ACA
EGSU200NSEACA
EGSU400NSEACA
30 EGSX150NSEA
EGSX200A
EGSX200NSEA
EGSX400NSEA
EGSU150NSEACA
EGSU200ACA
EGSU200NSEACA
EGSU400NSEACA
70–150 ATC, ATV and ATH switches EGSX150NSEA
EGSX200A
EGSX200NSEA
EGSX400NSEA
EGSU150NSEACA
EGSU200ACA
EGSU200NSEACA
EGSU400NSEACA
Liquid-cooled generators kW Transfer switch
22 EGSX150NSEA
EGSX200A
EGSX200NSEA
EGSU150NSEACA
EGSU200ACA
EGSU200NSEACA
Technical Data TD00405018E
Effective April 2017
EATON www.eaton.com
11
Technical Data TD00405018E
Effective April 2017
Generator sizing guide
NEC (700, 701, 702) comparison
NEC Comparison Table to be used as a general guideline in determining the proper generator for specific applications.
Refer to architectural documents for final selection.
Scope
Article 700 emergency
Legally required life safety
For emergency / (UL 2200)
Article 701 standby
Legally required critical support
(fire fighting, health hazards, etc)
For intended use / (UL 2200)
Article 702 optional standby
Protect property and facilities
For intended use / (UL 2200) / Not in 2008 Equipment approval
Testing
Witness testing (on-sight)
Periodic testing
Battery maintenance
Maintenance records
Load testing
Capacity
At install and periodically
Yes
Yes
Yes
Yes
All loads
Yes with load shedding
Yes
At install
Yes
Yes
Yes
Yes
None
None
None
None
None
All loads intended to operate at one time All loads intended to operate at one time
Not in 2008
Yes with load shedding
Yes
2008—yes with load shedding
Yes
Other standby loads allowed
Peak shaving allowed
Transfer switch
Automatic
Equipment approval
Means to permit bypass
Elect. operated—mech. held
Other loads
Max. fault current capable
Signals (audible and visual)
Derangement
Carrying load
Battery charger failed
Ground fault indication
NFPA 110 signaling
Signs
At service
At neutral to ground bonding
Wiring kept independent
Fire protection (ref 700-9d)
Maximum power outage
Retransfer delay
Automatic starting
On-site fuel requirements
Battery charger
Ground fault
Yes
For emergency / (UL 1008)
Yes
Yes
No
Yes
Yes / standard common alarm
Yes / displayed at ATS
Yes
Yes (480 V and 1000 A)
Yes / optional annunciator
Yes / type and location
Yes (if remote)
Yes
Yes (1000 persons or 75 ft building)
10 sec
15 min. setting
Yes
2 hours (see NFPA 110)
Yes
Indication only
Yes
For standby / (UL 1008)
No
No
Yes with load shedding
Yes
Yes / standard common alarm
Yes / displayed at ATS
Yes
No
Yes / optional annunciator
Yes / type and location
Yes (if remote)
No
No
60 sec
15 min. setting
Yes
2 hours
Yes
No
No
For intended use / (UL 1008)
No
No
N/A
Yes
Yes / standard common alarm
Yes / displayed at ATS
No
No
No
Yes / type and location
Yes (if remote)
No
No
N/A
No
No
None
No
No
12
EATON www.eaton.com
Generator sizing guide
Electrical formulas
To find:
KILOWATTS (kW)
KVA
AMPERES
WATTS
NO. OF ROTOR POLES
FREQUENCY
RPM kW (required for motor)
RESISTANCE
VOLTS
AMPERES
•
•
•
•
E = VOLTS
I = AMPERES
R = RESISTANCE (OHMS)
PF = POWER FACTOR
Known values
Volts, current, power factor
Volts, current kW, volts, power factor
Volts, amps, power factor
Frequency, RPM
RPM, no. of rotor poles
Frequency, no. of rotor poles
Motor horsepower, efficiency
Volts, amperes
Ohms, amperes
Ohms, volts
Single-phase
E x I
1000
E x I
1000 kW x 1000
E
Volts x amps
2 x 60 x frequency
RPM
I
E
I x R
E
R
RPM x poles
2 x 60
2 x 60 x frequency
Rotor poles hp x 0.746
Efficiency
Technical Data TD00405018E
Effective April 2017
Three-phase
E x I x 1.73 x PF
1000
E x I x 1.73
1000 kW x 1000
E x 1.73 x PF
E x I x 1.73 x PF
2 x 60 x frequency
RPM
I
E
I x R
E
R
RPM x poles
2 x 60
2 x 60 x frequency
Rotor poles hp x 0.746
Efficiency
EATON www.eaton.com
13
Technical Data TD00405018E
Effective April 2017
Weights and measures
U.S. weights and measures
Linear measurements
12 inches
3 feet
5.5 yards
=
=
=
1 inch
1 foot
1 yard
1 rod
40 rods
8 furlongs
=
=
Mile measurements
1 Statute =
1 Scots =
1 Irish =
1 furlong =
1 mile =
5,280 feet
5,952 feet
6,720 feet
=
=
=
=
1 Russian
1 Italian
=
=
3,504 feet
4,401 feet
1 Spanish = 15,084 feet
Other linear measurements
1 hand
1 span
1 chain
=
=
=
4 inches
9 inches
22 yards
2.540 centimeters
3.048 decimeters
9.144 decimeters
5.029 meters
2.018 hectometers
1.609 kilometers
1 link =
1 fathom =
1 furlong =
1 cable =
Square measurements
144 square inches
9 square feet
30
1/4 yards
40 rods
4 roods
640 acres
1 square mile
36 sections
Cubic or solid measure
1 cu foot
1 cu yard
1 cu foot
1 gallon (water)
1 gallon (U.S.)
1 gallon (Imperial)
=
=
=
=
=
=
=
=
=
=
=
=
=
=
1 square foot
1 square yard
1 square rod
1 rood
1 acre
1 square mile
1 section
1 township
1728 cu inches
27 cu feet
7.48 gallons
8.34 lb
231 cu inches of water
277
1/4
cu inches or water
7.92 inches
6 feet
10 chains
608 feet
Generator sizing guide
Metric system
Cube measure (The unit is the meter = 39.37 inches)
1 cu centimeter
1 cu decimeter
=
=
1000 cu millimeters
1000 cu centimeters
1 cu meter = 1000 cu decimeters
= 1 steer
1 cu centimeter (water) = 1 gram
=
=
=
=
0.06102 cu inches
61.02374 cu inches
35.31467 cu feet
1.30795 cu yards
1000 cu centimeter
(water)
= 1 liter
1 cu meter (1000 liters) = 1 metric ton
Measures of weight (The unit is the gram = 0.035274 ounces)
1 milligram = 0.015432 grains
= 1 kilogram
1 centigram
1 decigram
1 gram
1 dekagram
1 hectogram
1 kilogram
1 myriagram
=
=
=
10 milligrams
= 10 centigrams
= 10 decigrams
10 grains
= 10 dekagrams
= 10 hectograms
10 kilograms
= 0.15432 grains
= 1.5432 grains
= 15.4323 grains
= 5.6438 drams
= 3.5274 ounces
= 2.2046223 pounds
= 22.046223 pounds
1 quintal
1 metric ton
= 10 myriagrams
= 10 quintal
= 1.986412 cwt.
= 2,2045.622 pounds
1 gram
1 dram
1 metric ton
= 0.056438 drams
= 1.77186 grams
27.3438 grains
= 2,204.6223 pounds
Measures of capacity (The unit is the liter = 1.0567 liquid quarts)
1 centiliter
1 deciliter
1 liter
1 dekaliter
1 hectoliter
1 kiloliter
=
=
=
=
=
=
10 milliliters
10 centiliters
10 deciliters
10 liters
10 dekaliters
10 hectoliters
=
=
=
=
=
=
0.338 fluid ounces
3.38 fluid ounces
33.8 fluid ounces
0.284 bushel
2.84 bushels
264.2 gallons
N otee:
14
EATON www.eaton.com
Generator sizing guide
Weights and measures, continued
Metric system
Prefixes
a. mega b. kilo c. hecto
= 1,000,000
= 1,000
= 100 e. deci f. centi g. milli
= 0.1
= 0.01
= 0.001
d. deka = 10 h. micro = 0.000001
Linear measurement (the unit is the meter = 39.37 inches)
1 centimeter
1 decimeter
1 meter
=
=
=
10 millimeters
10 centimeters
10 decimeters
= 0.3937011 inches
= 3.9370113 inches
= 1.0936143 yards
3.2808429 feet
= 10.936143 yards 1 dekameter
1 hectometer
1 kilometer
1 myriameter
= 10 meters
= 10 dekameters
= 10 hectometers
= 10,000 meters
=
=
109.36143 yards
0.62137 mile
Square measurement (the unit is the square meter = 1549.9969 square inches)
1 sq centimeter = 100 sq millimeters = 0.1550 sq inches
1 sq decimeter
1 sq meter
=
=
100 sq centimeters
100 sq decimeters
=
=
15.550 sq inches
10.7639 sq feet
= 119.60 sq yards 1 sq dekameter = 100 sq meters
1 sq hectometer = 100 sq dekameters
1 sq kilometer = 100 sq hectometers
(The unit is the “are” = 100 square meters)
1 centiare
1 deciare
1 are
1 dekare
1 hektare
1 sq kilometer
= 10 milliares
= 10 centiares
= 10 deciares
= 10 ares
= 10 dekares
= 100 hektares
= 10.7643 sq feet
= 11.96033 sq yards
= 119.6033 sq yards
= 0.247110 acres
= 2.471098 acres
= 0.38611 sq mile
Cubic measure (the unit is the “stere” = 61,025.38659 cubic inches)
1 decistere = 10 centisteres = 3.531562 cubic inches
1 stere
1 dekastere
=
=
10 decisteres
10 steres
=
=
1.307986 cubic yards
13.07986 cubic yards
Technical Data TD00405018E
Effective April 2017
Metric designator and trade sizes
Metric designator
12 16
Grade size
27 35 41 53 63 78 91 103 129 155
3/8 1/2 1 1
1/4
1
1/2
2 2
1/2
3 3
1/2
4 5 6
U.S. weights and measures / metric equivalent chart
1 inch = 1
1 foot =
1 yard =
1 cm =
12
36
.3937
1
3
1 mile = 63,360 5,280
.333
1
1,760
1 mm = .03937
.0032808 1.0936 x
10-3
1.894 x
10-4
5.6818 x
10-4
1
6.2137 x
10-7
.0328084 .0109361 6.2137 x
10-6
304.8
914.4
1,609,344 160,934.4 1,690.344 1.609344
1
10
30.48
91.44
0.1
1
.3048
.9144
0.001
0.01
3.048 x
10-4
9.144 x
10-4
0.000001
0.00001
1 m =
1 km =
In
39.37
Ft
.0833
Yd
.0278
Mile
1.578 x
10-5
3.28084 1.09361 6.2137 x
10-4
mm
25.4
1000
cm
2.54
100
m
.0254
1
39,370 3,280.84 1,093.61 0.62137 1,000,000 100,000 1,000
km
2.54 x
10-5
0.001
1
Scientific notation
A way of expressing very large or very small numbers in a more compact format. Any number can be expressed as a number between 1 and 10, multiplied by a power of 10 (which indicates the correct position of the decimal point in the original number).
Numbers greater than 10 have positive powers of 10, and numbers less than 1 have negative powers of 10.
Useful conversions / equivalents
1 BTU
1 gram calorie
1 circular mil
1 sq mil
1 mil
Raises 1 lb of water 1 °F
Raises 1 gram of water 1 °C
= 0.7854 sq mil
= 1.27 cir mils
= 0.001
Generator and transfer switch products are supported by an unparalleled service network and sales force.
•
24-hour support 7 days a week
•
For pre-sale support, contact Eaton’s Technical Resource Center at 1-877-ETN-CARE
•
•
•
For installation and technical support, contact Eaton’s Aftermarket
Support team at 1-800-975-8331
Eaton generator and transfer switch products are backed by competitive warranties
For additional information or to place an order, contact your local
Eaton representative or visit us at httpe://generators.eaton.com
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15
Technical Data TD00405018E
Effective April 2017
Generator sizing guide
Eaton
1000 Eaton Boulevard
Cleveland, OH 44122
United States
Eaton.com
© 2017 Eaton
All Rights Reserved
Printed in USA
Publication No. TD00405018E / Z19452
April 2017
For additional information or to place an order, contact your local Eaton representative or visit us at
http://generators.eaton.com
Eaton is a registered trademark.
All other trademarks are property of their respective owners.
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Key Features
- Surge capability
- Fuel pipe sizing
- Liquid propane tank sizing
- UPS-generator compatibility
- Online estimating sheet
- On-site estimating sheet
- NEC (700, 701, 702) comparison
- Electrical formulas
- Weights and measures