Millwright Level 1 Practice Exam

What is the minimum safe distance from which an electric arc should be viewed without protection?

1. 15M (50ft)

2. 10M (30ft)

3. 12M (40ft)

4. 5M (16ft)

The correct answer is: 12M (40ft)

The minimum safe distance from which an electric arc should be viewed without protection is 12 meters (40 feet). This distance is established based on the intensity of the ultraviolet (UV) light emitted by electric arcs, which can cause serious eye injuries, including burns to the retina. At distances closer than 12 meters, the risk of such injuries significantly increases, as the UV radiation can reach harmful levels. Understanding this safe distance is crucial for maintaining safety in environments where electric arcs may occur, such as welding or electrical maintenance. Proper safety protocols emphasize the use of protective gear, including welding goggles or face shields, as well as maintaining appropriate distances to prevent exposure to harmful radiation. By maintaining a distance of at least 12 meters, individuals can significantly reduce the risk of eye damage and ensure a safer working environment when dealing with electric arcs.