What is HRC

Hazard Risk Category (HRC) is a rating range directly related to ATPV. There are 5 HRCs ranging from 0 to 4, with a hazard risk of 0 presenting the least risk and a hazard risk of 4 being the greatest risk.

Hazard
Risk
Category
 
Clothing Description
(Typical number of clothing layers is given in parentheses)
 
Required Minimum
Arc Rating of PPE
Cal/cm2

FR shirt and FR pants or FR coveralls (1 layer)
4

Cotton underwear plus FR shirt and FR pants (1 or 2 layers)
8

Cotton underwear plus FR shirt and FR pants plus FR coveralls, or Cotton underwear plus two FR coveralls (2 or 3 layers)
25

Cotton underwear plus FR shirt and FR pants plus multilayer flash suit (3 or more layers)
40

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