Section 2 — Installation
•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.
2.1.2 OTHER PUBLISHED STANDARDS
In addition to NFPA standards, the following informa- tion pertaining to the installation and use of standby electric systems is available:
NOTE:
It is essential to use the latest version of any stan- dard to ensure correct and current information.
•Where strong prevailing winds blow from one direction, face the generator air inlet openings into the prevailing winds.
•Install the generator as close as possible to the transfer switch. This reduces the length of wiring and conduit.
•Install the generator as close as possible to the fuel supply, to reduce the length of piping.
HOWEVER, REMEMBER THAT LAWS OR CODES MAY REGULATE THE DISTANCE.
2.3GENERATOR MOUNTING AND
SUPPORT
Retain the generator compartment to a concrete slab with
•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
•A52.1, AMERICAN NATIONAL STANDARD FOR CHIMNEYS, FIREPLACES AND VENTING SYSTEMS, available from the American National Standard Institute, 1430 Broadway, New York, N.Y. 10018.
2.4BASIC STANDBY ELECTRIC
SYSTEM
Figure 2.1 shows a schematic diagram of a basic standby electric system. Both the UTILITY power supply and the STANDBY (GENERATOR) output are connected to an approved transfer switch. The trans- fer switch is required by electrical code and serves the following functions:
•Allows 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.
2.2 GENERATOR LOCATION | Figure 2.1 – Basic Standby Electric System |
Install the generator set, in its protective enclosure outdoors, where adequate cooling and ventilating air always is available. Consider these factors:
• Install the unit where air inlet and outlet open- ings will not become obstructed by leaves, grass, snow, etc. If prevailing winds will cause blowing or drifting, consider using a windbreak to protect the unit.
• Install the generator on high ground where water levels will not rise and endanger it.
• This genset must be installed on a level surface. The base frame must be level within 1/2 inch all around.
• Allow sufficient room on all sides of the generator for maintenance and servicing. A good rule is to allow five feet of space on all sides.
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