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Steel Beams are an acceptable alternative. Foundations help in the servicing and repair of Gen-Set's and protect the unit from moisture that could occur from seepage. The concrete base that the generator is mounted to should be separate and independent from the surround- ing structure. The following applies to concrete bases: A Single (See Figure 1)or Double (See Figure 2) pedestal base may be used. A height of at least 6 inches higher than floor level is recommended. Figure 1- Single Pedestal Concrete Mount Figure 2 - Double Pedestal Concrete Mount . A double pedestal base allows easier cleaning under most generator's. . Double pedestals provide better access for inspecting for oil or fuel tank leaks. . The generator should be retained to the pedestal base with fasteners that are recommended by the generator set manufacturer. . The concrete base should extend beyond the genera- tor's "Footprint" by at least 12 Inches (305 mm) on all sides. . The higher the mounting base is made, the easier the unit will be to work on when performing maintenance, service, or repairs. Typically bases are required to be raised at least 6 inches (153 mm) above floor level. Placing the unit higher than 6 inches sometimes has the advantage of making it easier to change the unit's oil. . Passing fuel lines and electrical conduit for a "stub-up" through the concrete base is a standard practice of gen-set installers. . Concrete foundations are typically mixed by volume. The typical ratio of cement, sand, and aggregate is 1:2:3 with a maximum 4 inch (102 mm) slump and 28 day compressive strength of 2500 psi (173 kPa). . A generator can typically be mounted to a combustible floor or roof, dependent upon code, however, the sur- face beneath the engine and beyond the engine to a minimum distance of 12 inches (305 mm) must be covered with a non combustible insulation and a mini- mum of 24 gage sheet metal between the insulation and the generator. See Figure 3. Figure 3. Combustible Floor and Roof . Optional vibration isolators beyond those already built in the generator also help reduce transmitted noise, however, it is recommended that one verify that the generator manufacturer recommends the use of an isolator. . Insulation must be a non-combustible material, typi- cally a Fiberglas mat. 3. VENTILATION 3.1. OUTDOOR INSTALLATIONS - AIR COOLED UNITS If your generator is expected to be in temperatures lower than -20oF(-29oC) a cold weather package may be required. The following general rules apply: . Where strong prevailing winds are anticipated, face the engine end away from the wind. . Plan the installation carefully to prevent the cooling air vents on the generator from becoming clogged by leaves, grass, snow, etc. Page 13 Page 14 4. ELECTRICAL SYSTEM There are a number of different generator systems and typical loads in the context of electrical systems. Most sys- tems, unless they contain automated switch gear, have a means of disconnect between the generator and the load. This is typically a transfer switch or discon- nect. Ensure the contacts on the switch are rated for the size of your system. 4.1. GENERAL ELECTRICAL SYSTEM When mounting electrical panels, a 3 foot clearance is re- quired and the use of an emergency light to illuminate the unit during operation is typically required. Power for the emergency light should be from both the primary utility and the generator. This is highly recommend so that in the event of a malfunction there is a light source to see to work on the unit. Refer to your local building and electrical codes to ensure compliance. 4.2. CONDUCTOR SIZING CONNECTION This information is dependent upon your generator output and intended load. When connecting cables to the genera- tor, make connections at the generator first. Make the con- nections at the load last. Failure to do so may constitute a fire or safety hazard. All ampacities are typically calculated at 75 o C (Celsius) (167 o F(Fahrenheit) in the conductor size charts. Building wire conductors should be rated at 90oC(194oF) to allow for different ambient temperatures that these conductors may pass through. All conductors are typically required by electrical code to be copper. The recommended conductor sizes are based on maximum current. Ampacities are found in NEC Article 310, Table 310-16. Conductor resistances are found in NEC Ta- ble 8 "Conductor Properties". 4.3. CONNECTING THE GENERATOR Please the refer to the electrical drawing of the unit and your transfer switch documentation for information related. Leave the installation only to a trained personnel and don‘t forget to observe the local laws and permit requirements. Errors during the installation may damage the equipment and electrical devices connected to the unit and may create fire and electrocution risks. 5. EXHAUST SYSTEM 5.1. GENERAL (EXHAUST SYSTEM) Generator engines give off deadly carbon monoxide gas through their exhaust systems. Carbon monoxide gas, if breathed in sufficient conce...

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