Arc Flash PPE 31 cal/cm^2
Arc Flash PPE 31 cal/cm^2
(OP)
Hi,
I have a question regarding AFH. Here's a hypothecal case. If you have a system rated 28 cal/cm^2, you should have a cat4 PPE so with a minimum arc rating of 40 cal/cm^2
But...if you have a PPE rated at 31 cal/cm^2 (there's some equipment rated at this level), can you work at this place?
I would say yes, since the incident energy is less than the arc rating of the PPE (and it's not too close), but in NFPA 70E, it is written that for a cat4 you should have 40 cal/cm^2 minimum. Maybe NFA are referring on the simplified table method instead of the calculated one. I would like to know your opinion about this.
Thanks
I have a question regarding AFH. Here's a hypothecal case. If you have a system rated 28 cal/cm^2, you should have a cat4 PPE so with a minimum arc rating of 40 cal/cm^2
But...if you have a PPE rated at 31 cal/cm^2 (there's some equipment rated at this level), can you work at this place?
I would say yes, since the incident energy is less than the arc rating of the PPE (and it's not too close), but in NFPA 70E, it is written that for a cat4 you should have 40 cal/cm^2 minimum. Maybe NFA are referring on the simplified table method instead of the calculated one. I would like to know your opinion about this.
Thanks






RE: Arc Flash PPE 31 cal/cm^2
So in general, 28 cal/cm2 requires Hazard/Risk Category #4 PPE per NFPA 70E. Category #4 PPE is good up to a maximum of 40 cal/cm2. So with Category #4 PPE on, the worker is protected up to 40 cal/cm2. In theory.
RE: Arc Flash PPE 31 cal/cm^2
that's logic