Which item is described as a requirement for installations accessible to unqualified persons, along with additional precautions?

• A. Metal enclosure for indoor installations
• B. Minimum required dimensions for clear work space
• C. Entrance requirement for large equipment
• D. Overcurrent protection requirement

Answer: (A)

When installations could be accessed by unqualified persons, a protective metal enclosure for indoor installations is required. The metal enclosure serves as a solid barrier that prevents contact with live parts, reducing the risk of electric shock and arcing. It also allows the enclosure to be grounded, helping to safely direct fault currents and keep energized surfaces from being touched. In addition to the enclosure, other precautions such as proper labeling, restricted access, and locking devices further enhance safety by controlling who can reach the equipment.

The other options don’t address the accessibility risk this scenario highlights: workspace dimensions relate to providing room to work safely, entrance requirements for large equipment concern access logistics, and overcurrent protection focuses on electrical fault protection rather than preventing contact by unqualified persons.