Emergency Power Supply and UPS

Function and hazard

Standby generators and UPS systems bridge mains failures for life-safety systems (fire detection and suppression, emergency lighting, IT) as well as for production processes whose uncontrolled shutdown would cause consequential damage. The most common failure cause is not the absence of the system but its lack of operational readiness: discharged or aged batteries, degraded diesel fuel, faulty automatic transfer switches, or a rating that no longer matches the actual load profile.

Operation and testing

An effective programme includes regular load runs under realistic conditions, annual full-load tests, documented battery maintenance (internal resistance, state of charge, temperature) and periodic verification of the automatic transfer logic. For diesel sets, fuel quality and refuelling reserve are critical parameters; for UPS systems, battery life and cooling are decisive.

Insurance relevance

For business interruption and property insurers, documented operational readiness of the emergency power supply is a decisive factor in whether safety systems actually function in an event and consequential losses are contained. Untested or undersized systems are regarded as a significant weakness in the risk concept.