Integrity of emergency systems [UPS]

The reliability of emergency power systems has improved steadily since the earliest installations. The generator set, and its maintenance, will probably always be the most critical part of the system, but the application of the set and the rest of the system often prevents it from supplying power. This paper concentrates on the integrity of the system. It illustrates some actual cases of early failure of the wiring and environmental damage to the generator set, addresses some misunderstandings of generator set applications and reviews progress with strengthening code requirements.