How do work permits or lockout/tagout differ from "do not operate" tags in EV maintenance?

• A. LOTO physically prevents energization; work permits define scope and safety conditions; "do not operate" tags simply warn not to operate until cleared.
• B. LOTO is optional.
• C. Do not operate tags physically prevent energization.
• D. Work permits do not define safety conditions.

Answer: (A)

In EV maintenance, controlling energy sources and communicating safety requirements are essential. Lockout/tagout provides a physical barrier to energy: a lock on the energy-disconnecting device prevents it from being re-energized, so technicians can work on high-voltage systems like the traction battery with a strong, ongoing guarantee that power cannot flow. A work permit, on the other hand, is a formal authorization that defines exactly what work will be done, the hazards present, and the safety controls that must be in place; it sets the scope and the steps needed to perform the task safely. Do not operate tags are warnings that tell others not to operate the equipment until clearance is given, but they do not physically stop energy and depend on people to comply. Together, LOTO prevents energization, work permits define the task and protections, and do-not-operate tags communicate a temporary precaution until those protections are in place.