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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:
The following chart illustrates the five HRC levels with corresponding clothing, layer requirements and minimum arc ratings.
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.
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