How many locks should be applied when placing a Lockout/Tagout (LOTO) on a system?

The correct approach to Lockout/Tagout (LOTO) practices is to apply as many locks as there are personnel working on the system. This ensures that each individual who is involved in maintenance or servicing of the equipment has control over their own lock, preventing accidental re-energization of the system while they are working on it. Each worker uses their own lock and tag to signify that they are working on the equipment, which enhances safety by making it clear that multiple people are involved and that each person must agree to proceed before removing any locks.

This practice aligns with the principle of safeguarding individuals by allowing them to maintain control over the hazardous energy they are working on, ensuring that no other person can inadvertently energize the equipment while maintenance is ongoing. It promotes accountability and communication among team members, critical elements of workplace safety.

In contrast, relying on a single lock for the entire system would not account for multiple workers who may be servicing different parts of the system simultaneously, thus increasing the risk of accidents. Therefore, the practice of using as many locks as there are personnel is a fundamental safety measure in the context of Lockout/Tagout procedures.