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4.0 Installation and Operation Standards Underwriters Laboratories (UL), the Electrical Generating Systems Association (EGSA), and the National Fire Protection Association (NFPA) have developed standards most relevant to microturbine installations. Those three standards are summarized in this chapter. 4.1 UL 2200, Stationary Engine Generator Assemblies This standard deals almost exclusively with safety issues in relation to electrified equipment. It does not cover any mechanical performance standards of the prime mover and ancillary equipment. Currently microturbines are not referenced by name in the standard, although this is the central document by which third-party testing organizations are listing microturbine products as safe for operation. The requirements spelled out in this standard cover stationary engine generator assemblies rated 600 volts or less that are intended for installation and use in ordinary locations in accordance with the National Electrical Code, NFPA-70; the Standard for the installation and Use of Stationary Combustion Engines and Gas Turbines, NFPA-37; the Standard for Health Care Facilities, NFPA-99; and the Standard for Emergency and Standby Power Systems, NFPA-110. These requirements do not cover 1) generators for use in hazardous (classified) locations; 2) uninterruptible power source (UPS) equipment; or 3) generators for marine use. The contents of UL 2200 are in terms of the following sections: Construction of the Unit—Consists of essential features for general protection, controls, accessible circuits, and other mechanical and electrical subassemblies. Section 34 at the end of this part deals with requirements for “Protection of Service Personnel.” This part of the standard mandates, among other requirements, a minimum thickness of the cast metal enclosures and sheet metal enclosures of the generator assemblies; a minimum thickness for nonmetallic enclosures (UL 746C); flammability limits (UL 94); and minimum thickness and maximum area requirements for glass-covered openings. Mechanical Systems—Construction—Deals mainly with fuel systems and exhaust systems. Mechanical Systems—Performance—Deals with several testing requirements, including tests for harmonic distortion, voltage and frequency fluctuation, salt sprays, grounding impedance, overcurrent protection calibration, and impacts, among others. Marking—details and instruction manual 4.1PDF Image | PNNL 13277
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