NEC Commercial Electrical Practice Test

What is the maximum height above the floor or grade level for nonmetallic or metal-enclosed equipment accessible to the public before a lock is required?

1. 6 feet

2. 8 feet

3. 10 feet

4. 12 feet

The correct answer is: 8 feet

The maximum height for nonmetallic or metal-enclosed equipment that is accessible to the public before a lock is required is set at 8 feet. This standard is in place to ensure safety and minimize the risk of public access to potentially hazardous equipment. When equipment is within reach, there is a higher likelihood of individuals inadvertently coming into contact with it, which could result in accidents or injuries. By establishing the height limit at 8 feet, regulations aim to balance accessibility for maintenance and operation with the protection of the public from potential hazards. In settings where equipment exceeds this height, the requirement for a lock serves as an additional safety measure to restrict access and prevent unauthorized tampering or interaction with the equipment. This is particularly important in commercial environments where the average individual may be able to reach equipment installed up to 8 feet high but may struggle with equipment that is above that level. Thus, the 8-foot threshold acts as a critical point for determining when enhanced security measures, like locks, are necessary.