9
Technical Data TD00405018E
Effective August 2009
Generator Sizing Guide
EATON CORPORATION www.eaton.com
Transfer Switch Avalability
Single Phase* Amps
Service Entrance 100, 200, 400, 600, 800
Non-Service Entrance 50, 100, 200, 400, 600, 800
Three Phase
Service Entrance 100, 225, 300, 400, 600, 800
Non-Service Entrance
100, 200, 300, 400, 600, 800
* Single Phase ATS’s from 100-400 Amp have intelligent load management standard.
Onsite Estimating Sheet
Contractor______________________________________________ Email_________________________________________
Phone______________________________________________ Fax_____________________________________________
Job Name__________________________________________________________________________________________
Date__________________________________ Location__________________________________________________
VOLTAGE 120/240 1ø 120/208 3ø 120/240 3ø 277/480 3ø
TYPE Natural Gas LP Vapor (LPV)
ELEC. SERVICE 100 Amp 200 Amp 400 Amp 600 Amp Other____________
Before installation contact local jurisdiction to confirm all requirements are met. Jurisdictions may vary.
Eaton recommends contacting local authorities prior to installation.
Loads: 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 Rnning (= HP) Starting kW
•
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
Applications
The QT Series does not meet the
necessary requirements for the fol-
lowing 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 701Legally Required Standby
•
NEC 702 Optional Standby
•
NFPA 37 Installation & Use of
Stationary Engines
•
NFPA 54 National Fuel Gas Code
•
NFPA 58LP Gas Code
To Calculate kW
120 V 1ø Amps x 120/1000 = kW
240 V 1ø Amps x 240/1000 = kW
208 V 3ø (Amps x 208 x 1.732 x PF) /1000 = kW
240 V 3ø (Amps x 240 x 1.732 x PF) /1000 = kW
480 V 3ø (Amps x 480 x 1.732 x PF) /1000 = kW
Install notes:
•
Suggested concrete pad minimum thickness of 4” with 6” overhang on all sides. Composite
pad included with air-cooled products.
•
Consult manual for installation recommendations.
•
Consult local authority having jurisdiction for local requirements.
Recommended Generator Size ___________
Refer to Generator Sizing Instructions on other side of this sheet.
(4 paginas)
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