Layering of Arc Flash Clothing
Layering of Arc Flash Clothing
(OP)
I was having a conversation with a vendor today and he stated that you could layer FR clothing to get the desired FR rating. For instance, if the arc flash hazard is 59 cal/cm2 then you could wear 12 cal/cm2 coveralls and a 55 cal/cm2 suit (12 + 55 = 67 > 59).
I have never heard this and thought that you needed a 60 cal/cm2 suit.
I was hoping to get others opinion on 'adding cal/cm2 numbers' to get the desired protection. Thanks.
I have never heard this and thought that you needed a 60 cal/cm2 suit.
I was hoping to get others opinion on 'adding cal/cm2 numbers' to get the desired protection. Thanks.






RE: Layering of Arc Flash Clothing
60 cal/cm2 is cat > 4, so event with suit 60 cal/cm2 you cannot work there, since the suit will not protect you against the force of the explosion
But for a 40 cal/cm2 case per exemple, you can wear 2 x 20 cal/cm2 layer (event if it's not really confortable)
You must still have a hood rated 40 cal/cm2, since i think it's a little bit difficult to have two layer or more for the hood and facesheild.
RE: Layering of Arc Flash Clothing
Also, NESC refers to the effective arc rating of a "clothing system", which can be made up of multiple layers.
RE: Layering of Arc Flash Clothing
RE: Layering of Arc Flash Clothing
RE: Layering of Arc Flash Clothing
RE: Layering of Arc Flash Clothing
You can wear all the layers you want but a 60cal arc flash is like getting hit by a fridge at 100MPH
RE: Layering of Arc Flash Clothing
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If we learn from our mistakes I'm getting a great education!
RE: Layering of Arc Flash Clothing
David Castor
www.cvoes.com
RE: Layering of Arc Flash Clothing
RE: Layering of Arc Flash Clothing
That is somewhere the UK lags way behind the US. It relies totally on companies developing their own policies, and individuals making a stand when necessary. Hopefully that will change over time.
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If we learn from our mistakes I'm getting a great education!
RE: Layering of Arc Flash Clothing
RE: Layering of Arc Flash Clothing