What is the main purpose of a lockout/tagout device such as a padlock?

• A. To lock a switch in the off position.
• B. To lock the gear in place.
• C. To adjust voltage.
• D. To prevent rotation.

Answer: (A)

The main idea is to control hazardous energy during maintenance by physically preventing equipment from being energized. A padlock on a switch keeps that switch in the off position, so power can’t be restored accidentally while someone is working. This simple, reliable barrier protects workers from unexpected startups. The other ideas describe locking gears, adjusting electrical settings, or preventing rotation, none of which address isolating energy sources to keep a machine safe during servicing.