Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A technician is troubleshooting an electrical fault on a piece of heavy equipment. The equipment's main power switch is off, but there's a stored energy warning for capacitors in the control system. What is the correct procedure to follow before beginning work?
Even with the main power off, capacitors can store lethal amounts of electrical energy. A lockout device is essential for the main power, and a specific, safe d
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Question: A technician is troubleshooting an electrical fault on a piece of heavy equipment. The equipment's main power switch is off, but there's a stored energy warning for capacitors in the control system. What is the correct procedure to follow before beginning work?
Answer options: ✅ Apply a lockout device to the main power switch and follow the manufacturer's discharge procedure for the capacitors.
- Assume the capacitors will self-discharge after a few minutes and proceed with caution.
- Use a screwdriver to short the capacitor terminals, ensuring a quick discharge.
- Disconnect the battery terminals and then immediately start working on the control system.
Correct answer: Apply a lockout device to the main power switch and follow the manufacturer's discharge procedure for the capacitors.
Explanation: Even with the main power off, capacitors can store lethal amounts of electrical energy. A lockout device is essential for the main power, and a specific, safe discharge procedure for capacitors must be followed to eliminate stored energy before any work begins. Shorting terminals directly is extremely dangerous, and disconnecting the battery does not discharge capacitors.
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