Multiple supplies and backfeed

Leader: review the source and site procedures before presenting. Adapt this briefing to today’s task and the crew’s language and training needs. This is an original educational talk, not OSHA-issued training or certification.

Start the conversation

A building has utility power, a generator, and a solar installation. Opening one disconnect may leave other energy sources present.

Key talking points

• Discuss every known supply with the responsible electrical supervisor before servicing equipment. Include alternate supplies and stored energy in the task assessment rather than assuming the utility is the only source.
• Review current equipment documentation and the employer's isolation procedure. Transfer switches, interconnections, and control circuits can make the work boundary more complex than it first appears.
• Do not operate unfamiliar switching equipment to experiment with what turns off. Switching and testing must be assigned to people qualified and authorized for the actual system and task.
• Tell other crews which equipment remains outside the isolated work area. A successful shutdown in one enclosure does not establish that an adjacent enclosure is safe to enter.
• If a new supply or unexpected indication appears, stop and escalate it. Revise the work plan before continuing instead of treating the discrepancy as a harmless instrument problem.
• Crew exercise: apply this discussion to one actual location in today's assignment. Describe the sequence from preparation through cleanup, identify who could be affected, and agree what must be in place before the first person starts. Use a drawing or a safe observation point; do not create an exposure for the demonstration.
• Make the decision practical: name the person who will resolve missing information and confirm the controls. If the planned conditions change, stop the affected activity and obtain a revised plan. At the next briefing, review whether the agreed action was completed and what the crew learned.

Ask the crew

1. What is the most important hazard in our version of this task?
2. What would make us stop and ask for a revised plan?

Before work starts

Identify one task-specific improvement, assign a responsible person, and confirm it is in place before the affected work begins.