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Safety Standards

 

  

Introduction to the Electrical Safety Standards– NFPA 70 E CSAZ462                                   

     Wearco Safety Pro's Fire Rardant clothing has been tested to meet and exceed the safety stardard requirements, that fall under NFPA 70E & CSA Z462 certified. 

                                                         What is Arc Flash?

An Arc flash is caused by a voltage breakdown of the resistance of air resulting in an arc which can occur where there is sufficient voltage in an electrical system and a path to ground or lower voltage. An arc flash with 1000 amps or more can cause substantial damage, fire or injury. The massive energy released in the fault, instantly vaporizes the metal conductors involved, blasting molten metal and expanding plasma outward with extreme force.  An arc flash incident can cause an explosion, that could severely injure or kill workers as well as those nearby if they are not wearing Arc Flash protection.

      CSA-Z462 has been developed in parallel with the 2009 Edition of NFPA 70E, and, based on an agreement with NFPA, has been made to harmonize Z462 with NFPA 70E as much as practicable for Canadian workplaces.  As agreed with NFPA, CSA used the 2004 Edition of NFPA 70E as the “seed document” for the development of Z462.  This common basis will help ensure that, right from the start, CSA-Z462 is harmonized with NFPA 70E

Arc Rating: A value of the energy necessary to pass through any given fabric to cause   with 50% probability a second or third degree burn. This value is measured in calories/cm². The necessary Arc Rating for an article of   clothing is determined by a Hazard/Risk Assessment and the resulting   HRC. Usually measured in terms of ATPV or EBT.

The HRC (Hazard/Risk Category): The five Hazard/Risk categories are specified by the chart listed in NFPA   70E. The chart, based on specific job tasks, ranges from HRC 1 (which is   low risk and allows for 100% treated cotton), up to HRC 4 (which is   high risk and requires FR clothing with a minimum arc rating of 40 cal/cm2). The   HRC is used to determine the necessary arc rating of a garment worn   during a given job task.

 

Hazard Catagorie Garment Description Arc Rating of PPE

                                                                        Cal/cm2

 

hrc1.pngFR shirt and FR pants or coveralls 1layer        4

 hrc2.pngCotton underwear plus FR shirt and FR pants , 

              or FR  coveralls.     (1 or 2 layers)                    8

hrc3.pngCotton underwear plus FR shirt and FR pants

             plus FR coveralls, or Cotton underwear

             plus two FR coveralls (2 or 3 layers) or quilted

             FR      Winterwear                                          25

hrc4.pngCotton underwear plus FR shirt and FR pants

              plus multilayer flash suit (3 or more layers)

              or quilted FR Winterwear                             40

 

 

 

 

 

 

 


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