What is the Hazard Risk Category (HRC) of NFPA 70E? -C&G Safety

HRC is a 2004 NFPA 70E rating of exposure levels for particular types of equipment. The values range from zero to four, with a zero HRC not requiring any ATPV-rated PPE. The minimum ATPV rating for Categories One through Four are as follows:
  • Category One: five calories per square centimeter
  • Category Two: eight calories per square centimeter
  • Category Three: 25 calories per square centimeter
  • Category Four: 40 calories per square centimeter
The following chart illustrates the five HRC levels with corresponding clothing, layer requirements and minimum arc ratings.
What is the Hazard Risk Category (HRC) of NFPA 70E?
Overclothing: Any arc-flash rated clothing with a HAF of less that 70 percent is considered overclothing. This means that the flash-rated clothing must be worn over a suitable undergarment to protect the wearer. Typically, the undergarments in this situation would be 100 percent cotton. Other undergarment fabrics may be required in special situations.
What is the Hazard Risk Category (HRC) of NFPA 70E? -C&G Safety: What is the Hazard Risk Category (HRC) of NFPA 70E?

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