Technical Standards and Safety Authority (TSSA) G3 Practice Exam

Which of the following is acceptable for locking out equipment?

1. Keyed lock

2. Combination lock

3. Neither a nor b

4. Both a and b

The correct answer is: Keyed lock

A keyed lock is an acceptable method for locking out equipment because it provides a secure means of preventing unauthorized access or operation. The use of a keyed lock minimizes the risk of accidental or intentional energization of machinery, which is critical for ensuring the safety of personnel working on or near the equipment. Keyed locks require a specific key to unlock, meaning that only authorized personnel can operate the equipment. This enhances accountability and control over the equipment. Regarding the other options, while combination locks are also a widely accepted method of locking out equipment, it may not offer the same level of security as a keyed lock in certain situations. Combination locks require knowledge of the code, but if that code is known to multiple employees, it can increase the risk of unauthorized access. Therefore, both keyed locks and combination locks are valid locking out methods, leading to the conclusion that the best answer is that both methods are acceptable.