Be Aware of the Established Flash Protection Boundaries (FPB) and Procedures

The "Limited Approach Boundary" is the limit of approach distance for unqualified persons, that is, those less capable of recognizing a shock or flash hazard, to be near a live part.


The "Restricted Approach Boundary" should never be crossed by any unqualified person. Even qualified people must have an approved work plan and use personal protection equipment approved for those work conditions.


The "Prohibited Approach Boundary" (removed in 2015) is the minimum approach distance to an exposed energized conductor and is the closest point to prevent flashover. In order to cross into prohibited space, qualified personnel must do all of the following:

  • Be specifically trained to work on energized conductors or circuit parts.
  • Have a documented plan that justifies the need to work inside the prohibited approach boundary.
  • Perform a hazard risk analysis.
  • Have both the documented justification plan and the hazard risk analysis approved by the site manager.
  • Wear personal protection equipment as if they would be in direct contact with the energized part.

It is against the law for anyone other than a trained Electrician or authorized person to perform such work requiring levels of PPE and training NOT allocated to the work member and/or team leader level.


Only an Electrician can go into an electrical panel!


This and other citations within NFPA 70E make it clear that these references are referring to trained electricians.

  • You can do minor maintenance outside of the panels.
  • You have received training on Arc Flash/Blast and ECPL.


As a result of this training you do not have the authority to enter into an Electrical Panel.



Figure 1: AIMSS Arc Flash Boundaries