An electrical panel needs maintenance work. The lockout/tagout procedure requires that the energy source be:
Correct Answer
A) Isolated, locked out, tagged, and tested
Proper lockout/tagout procedures require the energy source to be isolated, physically locked out, tagged with information, and then tested to verify it is de-energized before work begins.
Why This Is the Correct Answer
Option A correctly identifies all four essential steps of proper lockout/tagout (LOTO) procedures as mandated by OSHA standards. The energy source must be isolated from its power supply, physically locked out using appropriate devices, tagged with identification and warning information, and then tested to verify complete de-energization before any maintenance work begins. This comprehensive approach ensures maximum worker safety by preventing accidental re-energization during electrical work.
Why the Other Options Are Wrong
Option B: Turned off and marked with warning tape
This option is incomplete as it only addresses turning off the power and marking with tape. It fails to include the critical steps of physical lockout devices and testing for de-energization. Warning tape alone does not provide adequate protection against accidental re-energization, and without testing, workers cannot verify the circuit is truly safe to work on.
Option C: Disconnected and posted with a sign
While disconnection and signage are important safety measures, this option lacks the essential physical lockout component and testing verification. Signs can be ignored or removed, and without proper lockout devices and energy verification testing, workers remain at risk of electrical shock or electrocution from unexpected re-energization of the circuit.
Option D: De-energized and barriers installed
This option mentions de-energization and barriers but omits the crucial lockout and tagout components required by OSHA standards. Barriers alone cannot prevent someone from re-energizing the circuit, and without proper lockout devices and identification tags, there's insufficient protection and communication about the ongoing maintenance work to other personnel.
Memory Technique
Remember 'I-L-T-T' for lockout/tagout: Isolate the energy source, Lock it out physically, Tag it with information, and Test to verify it's de-energized.
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