Which statement about locking receptacles is true?

• A. They require no locking mechanism to secure the plug.
• B. They are designed exclusively for outdoor use.
• C. They secure the plug with a locking mechanism.
• D. They cannot be used with straight blade plugs.

Answer: (C)

Locking receptacles secure the plug with a locking mechanism, providing a positive, vibration-resistant connection that stays engaged until you release it. This locking feature is what ensures the plug can’t be easily pulled out, which is crucial in settings with movement, vibrations, or safety concerns. Because the lock is the defining trait, statements that say there’s no locking mechanism miss the primary purpose of this design. They’re not limited to outdoor use; you’ll find locking receptacles in indoor as well as outdoor environments, depending on the model and rating. And while locking systems work with locking plugs, a standard straight blade plug won’t engage the lock, so these receptacles aren’t used with non-locking plugs for a secured connection.