CSLB C-46 Solar ContractorSafetyMedium
A solar crew is about to begin work on a rooftop where an existing HVAC unit's disconnect switch is located. The HVAC unit is not part of the solar installation, but its circuit is adjacent to the work area. To comply with Lockout/Tagout (LOTO) procedures, what is the FIRST step the authorized employee should take?
- ATest the circuit with a voltmeter to ensure it is de-energized.
- BNotify all affected employees that the LOTO procedure is about to begin.
- CTurn off the HVAC unit's disconnect switch.
- DPlace a lockout device and tag on the disconnect switch.
Show answer & explanationAnswer & explanation
Correct answer: B. Notify all affected employees that the LOTO procedure is about to begin.
According to OSHA's LOTO standard (29 CFR 1910.147), the first step in applying LOTO is to notify all affected employees that the equipment will be shut down and locked out. This ensures everyone is aware and can take necessary precautions.
Why the other options are wrong
- A. Testing for de-energization is a critical step, but it occurs after the equipment has been shut down and locked out.
- C. Turning off the disconnect switch is the second step, after notification, to de-energize the equipment.
- D. Placing the lockout device and tag occurs after shutting down the equipment, but before verifying de-energization.
LOTO Step 1: Notification
The initial step in a Lockout/Tagout procedure requires informing all affected employees that machinery or equipment will be shut down and locked out to prevent accidental energization.
- Ensures worker awareness and safety.
- Prevents unexpected startups.
- Applies to all personnel who might be affected by the LOTO.
Memory trick: Notify, Shut, Lock, Test: The LOTO steps, put to the test!