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Power Systems, Inc. 9
If an open bottom is used, the engine-generator is
to be installed over non-combustible materials
and should be located such that combustible
materials are not capable of accumulating under
the generator set.
Only qualified, competent installation contractors or
electricians thoroughly familiar with applicable codes,
standards and regulations should install this standby
electric power system. The installation must comply
strictly with all codes, standards and regulations per-
taining to the installation.
After the system has been installed, you must not do
anything that might render the installation in noncom-
pliance with such codes, standards and regulations.
NOTE:
For more information about the installation of a stand-
by system, you can order Engine-Generator Standby
Electric Power Systems Installer’s Guide and
Reference Manual (part #046622) from your Generac
Authorized Service Dealer.
NFPA STANDARDS
The following published standards booklets pertaining
to standby electric systems are available form the
National Fire Protection Association (NFPA),
Batterymarch Park, Quincy, MA 02269:
• NFPA No. 37, STATIONARY COMBUSTION ENGINES
AND GAS TURBINES.
• NFPA No. 76A, ESSENTIAL ELECTRICAL SYSTEMS
FOR HEALTH CARE FACILITIES.
• NFPA No. 220, STANDARD TYPES OF BUILDING
CONSTRUCTION
• NFPA No. 68, GUIDE FOR EXPLOSION VENTING
• NFPA No. 70, NATIONAL ELECTRICAL CODE.
• NFPA No. 30, FLAMMABLE AND COMBUSTIBLE
LIQUIDS CODE.
• NFPA No. 10, INSTALLATION, MAINTENANCE AND
USE OF PORTABLE FIRE EXTINGUISHERS.
OTHER PUBLISHED STANDARDS
In addition to NFPA standards, the following informa-
tion pertaining to the installation and use of standby
electric systems is available:
• Article X, NATIONAL BUILDING CODE, available
from the American Insurance Association, 85 John
Street, New York, N.Y. 10038.
• AGRICULTURAL WIRING HANDBOOK, obtainable
from the Food and Energy Council, 909 University
Avenue, Columbia, MO, 65201.
• ASAE EP-364.2, INSTALLATION AND MAINTE-
NANCE OF FARM STANDBY ELECTRIC POWER,
available from the American Society of Agricultural
Engineers, 2950 Niles Road, St. Joseph, MI 49085.
• A52.1, AMERICAN NATIONAL STANDARD FOR
CHIMNEYS, FIREPLACES AND VENTING SYS-
TEMS, available from the American National
Standard Institute, 1430 Broadway, New York, N.Y.
10018.
BASIC STANDBY ELECTRIC SYSTEM
Figure 2.1 shows a schematic diagram of a basic stand-
by electric system. Both the UTILITY power supply and
the STANDBY (generator) output are connected to an
approved transfer switch. The transfer switch is
required by electrical code and serves the following
functions:
• Permits the LOAD circuits to be connected to only one
power supply at a time.
• Prevents electrical backfeed between the generator
and the UTILITY power circuits.
Notice that both the STANDBY and the UTILITY power
supplies to the transfer switch are protected against
overload by a main line circuit breaker.
NOTE:
Generac recommends the use of a Generac power
systems “GTS” type transfer switch in conjunction
with this generator.
Figure 2.1 – Basic Standby Electric System
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Section2—Installation
Guardian Liquid-cooled 10 kW, 15 kW, 20 kW and 25 kW Generators
STANDBY GENERATOR INSTALLATION
Connecting this generator to an electrical system normally supplied by an electric utility shall be by
means of a transfer switch (such as the Generac “GTS” type transfer switch), so as to isolate the electric
system from the utility distribution system when the generator is operating. Failure to isolate the
electric system by these means will result in damage to the generator and may also result in injury
or death to utility workers due to backfeed of electrical energy.