How many locks must be applied to a power source during lockout?

The appropriate number of locks to apply to a power source during lockout is one for every person working on the equipment. This practice is a key component of lockout/tagout (LOTO) procedures, which are designed to ensure that machinery is properly shut down and unable to be started while maintenance or service work is being performed.

By having one lock for each individual, it ensures that all people who need to access the equipment can securely lock it out, giving them control over the power source. This prevents accidental re-energization while multiple individuals are working on the equipment, significantly enhancing safety by making it clear that the equipment is being serviced and cannot be operated until all locks are removed. This method fosters communication and accountability among team members and helps to minimize the risk of injury.

In contrast, applying only one lock would not guarantee the safety of individuals if multiple people are working on the equipment, as someone could inadvertently unlock the power source and endanger others. The absence of locks would completely undermine the purpose of LOTO procedures, leaving workers vulnerable to accidental machine activation.