Just found out arc flash boundaries are way bigger than I thought

I was looking up NFPA 70E stuff last night and saw the arc flash boundary for a 480v panel can be like 20 feet with high fault current... has anyone else actually measured theirs on a job site?

3 comments

3 Comments

michael66929d ago

Yeah that one caught me off guard too. I always figured a few feet was plenty, but then I ran the numbers for a 480V panel with a 40kA fault current and it came out to like 18 feet. Definitely changed my thinking on how close I stand to stuff now.

william_harris28d ago

Electricity always makes you realize how little things add up way faster than you'd expect.

seth_singh2028d ago

lol yeah but nobody talks about how arc flash gear turns into a sauna in like 30 seconds flat.