Fire case histories make an argument for requiring survivability of all fire alarm system circuits. A fire occurred in the London Apartments for the elderly in Delaware, Ohio, on March 12, 1994. Manual fire alarm boxes and corridor smoke detectors were connected to the building’s fire alarm system.
The Occupational Safety and Health Administration (OSHA) estimates that 1.6 million U.S. workers enter confined spaces every year. Unfortunately, nearly 100 workers are killed, and more than 5,000 other accidents occur annually in such environments.