Which step ensures energy cannot be re-applied while work is performed?

• A. Identify flash protection and wear
• B. Lockout/Tagout (LOTO)
• C. Open disconnect device
• D. Turn off the equipment (load)

Answer: (B)

The main concept is preventing re-energization while work is performed by isolating all energy sources. Lockout/Tagout creates a physical lock on energy sources and places warning tags to show that the equipment is under maintenance and must not be energized. With the lock in place, even if someone tries to restart the machine, the lock blocks re-energization unless it’s removed by the authorized person. This ensures a true zero-energy state and protects workers from unexpected starts or energy release, including stored or residual energy.

Other steps don’t provide the same protection. Identifying flash protection and wear relates to personal protective equipment, which helps if energy is present but doesn’t stop the equipment from being re-energized. Simply turning off the equipment or opening a disconnect may leave stored energy or be bypassed if someone clears the disconnect or removes the lock, allowing a restart. Lockout/Tagout is the defined procedure that prevents re-energization during maintenance.