NEC Commercial Electrical Practice Test

At what height must live parts operating at 50 volts or more be guarded to prevent accidental contact?

1. 6 feet

2. 8 feet

3. 10 feet

4. 12 feet

The correct answer is: 8 feet

Live parts operating at 50 volts or more must be guarded to prevent accidental contact at a height of 8 feet. This requirement is specified in the National Electrical Code (NEC) to provide safety in environments where individuals might be present. The 8-foot height is generally recognized as a suitable distance to reduce the risk of inadvertent contact with electrical components, particularly in areas where maintenance and other activities take place. This regulation aims to minimize hazards arising from electrical faults or unintentional contact by persons who may be working or operating equipment in proximity to these live parts. By establishing this height requirement, the NEC helps to ensure that individuals are less likely to accidentally reach or come into contact with potentially dangerous electrical components, thereby enhancing workplace safety.