Arc flash temperatures can reach 35,000°F, which is hotter than the surface of the Sun. True or False?

• A. True
• B. False
• C. It varies by material
• D. Not enough information

Answer: (A)

Electrical arc flashes release heat so intense that temperatures can reach tens of thousands of degrees Fahrenheit. The claim that arc flash temperatures can reach 35,000°F is true. That temperature is about 19,400°C, which is far hotter than the Sun’s surface, roughly 5,500°C (about 9,932°F). This shows how extreme the energy from an arc can be, even though the flash lasts a very short time and is localized. The exact temperature can depend on factors like voltage, current, gap, and duration, but such extreme heat is a well-recognized hazard of arc flashes. This is why proper PPE and safety procedures are essential when working with energized equipment.