Safety Alert

What Happened

During planned maintenance on the main power distribution board, a backup generator auto-started unexpectedly. The isolation procedure did not include the backup generator interlock. The maintenance crew narrowly avoided contact with an energised bus bar.

Why It Matters

Electrical contact incidents have some of the highest fatality rates of any workplace hazard. This event came within metres of electrocution. The root cause — an incomplete isolation procedure — represents a systemic gap that could affect other equipment with backup power sources.

Immediate Actions Required

1. 1All electrical isolation procedures to be reviewed for completeness, specifically checking for backup power sources, UPS systems, and auto-start generators
2. 2Stand-down for all electrical maintenance work pending isolation procedure review completion
3. 3Backup generator interlock to be added to the isolation register for the power station
4. 4Mandatory dual-verification of isolations for all high-voltage work

Key Learning

Isolation procedures must account for ALL energy sources, including backup and emergency systems that may activate automatically. If in doubt, test before touch. Verify dead, every time.

Discussion Points for Toolbox Talk

• •How do you verify that ALL energy sources are isolated before starting work? What's your personal check process?
• •Have you ever encountered an unexpected energy source during maintenance? What happened?
• •What equipment on our site has backup power sources that might not be obvious from the main isolation point?