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Heavy Duty Equipment Technician Red Seal Exam Prep · Question

A heavy equipment technician is performing a diagnostic procedure on a machine's electronic control unit (ECU). The procedure requires the machine to be powered on, but a large rotating component is in close proximity to the work area. What is the most effective and compliant safety procedure?

When LOTO cannot fully de-energize all hazards (e.g., for diagnostics requiring power), a Controlled Access Zone with a spotter and exclusion of non-essential p

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Question: A heavy equipment technician is performing a diagnostic procedure on a machine's electronic control unit (ECU). The procedure requires the machine to be powered on, but a large rotating component is in close proximity to the work area. What is the most effective and compliant safety procedure?

Answer options:

  • Place warning signs around the machine and instruct others to keep clear.
  • Work quickly and carefully while avoiding contact with the rotating component. ✅ Implement a 'Controlled Access Zone' with a dedicated spotter and ensure all non-essential personnel are excluded, in addition to using appropriate LOTO for any other energy sources that can be isolated.
  • Temporarily remove the rotating component to perform diagnostics, then reinstall it.

Correct answer: Implement a 'Controlled Access Zone' with a dedicated spotter and ensure all non-essential personnel are excluded, in addition to using appropriate LOTO for any other energy sources that can be isolated.

Explanation: When LOTO cannot fully de-energize all hazards (e.g., for diagnostics requiring power), a Controlled Access Zone with a spotter and exclusion of non-essential personnel is crucial to manage the remaining risks, while still applying LOTO where possible.

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