Whenever electrical equipment fails unexpectedly and without warning, it requires investigation
of all the facts surrounding the failure, and can result in a catastrophic event, costly downtime, loss of revenue, or replacement of equipment.

Such was the case during a recent loss of two main industrial chillers. With a common failure of two 3 phase chiller fuses on two phases, engineers at Gainesville Regional Utilities suspected the cause was an electrical power source problem feeding the chillers.

This case study examines the incident and the resulting investigation of its cause.