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In addition to its primary objective of supplying power for emergency lighting to assure the safe and panic-free evacuation of people during emergency conditions, power must be supplied for the continued operation of vital building service functions, even if the building is sparsely populated and not open to the general public Examples of these functions are the operation of fire detection and alarm systems, selected elevators, fire pumps, and public safety communication systems During power outages, facilities such as laboratories or chemical process plants must continue to operate ventilation systems where toxic gases, dangerous biological substances, or radioactive materials are present If the ventilation system is shut down, these toxic gases or noxious vapors could accumulate rapidly, contaminate the air and injure or incapacitate persons exiting the building, or be the cause of later health problems Although less critical from a health and safety standpoint, power for ovens or equipment processing metals, chemicals, pharmaceuticals, or other similar materials must be available following a normal power outage to prevent the loss of raw or partially processed product Also, emergency power must be available for refrigeration in food processing plants, cold-storage warehouses, and even large restaurants, to prevent the loss of perishable meat and produce
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EMERGENCY AND STANDBY SYSTEMS
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A standby engine generator set driven by an internal combustion engine is shown in Fig 11-3 Also illustrated are the necessary support equipment, wiring, plumbing, and fuel source A standby engine generator requires a means for automatically starting the internal combustion engine when normal power fails and automatic transfer switches for powering all critical electrical circuits A 15-min time delay must be installed to avoid premature transfer if normal power is restored within that time interval As shown in the figure, an on-site fuel supply in a storage tank is provided The fuel supply must be sufficient for at least 2 hrs of full-demand operation An AC generator suitable for use with a standby engine generator is shown in Fig 11-4 It is common practice for factories, hospitals, government agencies, and educational institutions that require standby engine generator sets to supplement them with rechargeable storage battery standby power systems to sustain critical functions until the generator sets can be started, go on line, and pick up the load Standby engine generator sets must not be dependent on the municipal water supply if water is needed for cooling the internal combustion engine This means that there must be sufficient water available in a storage tank In general, if dual-fuelsupply tanks are used, a means must be provided for automatically transferring fuel from one supply tank to the other Methods for transferring loads from their normal (electric utility or commercial) source to standby generators with transfer switches are illustrated in Fig 11-5 The one-line diagram Fig 11-5a shows how a complete electrical load is transferred to the standby generator with one transfer switch, and the diagram Fig 11-5b shows how only the critical load is transferred Electrical systems can be served by one or more automatic or manual transfer switches The power riser diagram Fig 11-6 shows the equipment and the wiring specified for a 70-kW, 120/208-V three-phase standby engine generator set In this installation a , 500-gal fuel tank is buried in the ground outside the building in which the generator set is located The boxes marked A through F are electrical distribution subpanels Commercial standby engine generator sets driven by internal combustion engines are available in a wide range of output power ratings Four different fuels are commonly used for powering these sets: diesel fuel, gasoline, natural gas, and liquefied propane Portable diesel or gasoline engine generator sets capable of outputs from 33 to 12 kW are sold as complete packaged units mounted on a carrying frame or platform They are designed to supply standby power for homes and farms, but they are also purchased for use in mobile homes, recreational vehicles, and boats These sets must be located where they can be properly exhausted and will not present a fire hazard This usually means operating them from an outdoor location, preferably protected from the weather and close to the service entrance and loadcenter Each set includes an external transfer switch that must be connected to the loadcenter of a home or building, or the equivalent in a mobile vehicle or a boat If these engine generator sets are to be used as standby systems in homes, buildings, or permanently located mobile homes, permission to operate them must be
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