Lockout/Tagout: Lock It Down

The first word in lockout/tagout is “lock” but correct application of locks often remains a mystery to those conducting a lockout/tagout.

First, you can't lock out a device unless it is a lockable device. For example, you have a 120V distribution panel in the front office of a small factory and need to pull a new circuit. The panel doesn't have a lockout means. But if it's a subpanel, you can probably lock out its supply breaker. In the worst case scenario, you'll have to apply the requirements of NFPA70E 130.2(A).

When selecting and/or installing new equipment such as disconnecting devices, keep lockability in mind.

Never put one lock through another lock. If you need multiple locks on a single disconnecting mechanism, use a multi-lock hasp. This way, each lock can do its job (locking out the mechanism).

Always hang a tag with a lock. This way, people know who affixed that lock and when. Always remove the tag when you remove the lock.