Engines for Emergency Use : Engines that operate under limited use conditions to support critical operations in the protection of life, property, or both
NFPA 37 Standard for the Installation and Use of Stationary Combustion Engines and Gas Turbines, 2002 ed. http://pozhproekt.ru/nsis/nfpa/NFPA37-2002.pdf, (Std: Install and Use of Stnry Combustion Engines and Gas Turbines - Amer) {201 NFC}