High voltage interrupting switch failure results in arc flash
Incident Investigation
High voltage interrupting switch failure results in arc flash
June 30, 2019
Electrical
Reference Number:
II-882604-2019 (#14507)
Location: Nanaimo
Regulated industry sector: Electrical - High voltage electrical system (greater than 750V)
Impact
Injury
Injuries: 0
Injury description: NA
Injury rating: NA
Incident rating: Major
Incident overview
During a routine isolation process to install equipment and record measurements to facilitate future retrofit installations of breakers, a main high voltage interrupting switch for a transformer failed when opening, resulting in an arc flash and damage to the equipment.