Solutions By Design

NFPA 70E Requirements


An arc flash hazard analysis shall determine the Arc Flash Protection Boundary and the personal protective equipment that people within the Arc Flash Protection Boundary shall use.  The arc flash hazard analysis shall be updated when a major modification or renovation takes place.  It shall be reviewed periodically, not to exceed five years, to account for changes in the electrical distribution system that could affect the results of the arc flash hazard analysis.


Electrical equipment such as switchboards, panelboards, industrial control panels, meter socket enclosures, and motore control centers that are in other than dwelling units, and are likely to require examination, adjustment, servicing, or maintenance while energized, shall be field marked with a lable containing all the following information:

     At least one of the following:

  •      Available incident energy and the corresponding working distance
  •      Minimum arc rating of clothing
  •      Required level of PPE
  •      Highest Hazard/Risk Category (HRC) for the equipment

     Nominal system voltage

     Arc Flash Boundary


Labels applied prior to September 30, 2011 are acceptable if they contain the available incident energy or required level of PPE.