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Technical Data TD00405018E
Effective August 2009
Generator Sizing Guide
EATON CORPORATION www.eaton.com
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 supercede 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
Onsite 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 Eaton’s Technical Service Center toll free at 1-800-975-8331
during normal business hours (8 a.m. to 4 p.m. CST).
(4 paginas)
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