An arc-flash-incident energy analysis quantifies the incident energy that will be released during an arc flash event at each location in the electrical system. The results of the incident energy analysis are printed on an arc flash label for use by the qualified electrical worker to determine the appropriate personal protective equipment (PPE) to be worn while performing energized electrical work.

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10 essential steps to support arc flash incident
energy analysis

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The executive summary will describe the
major action items associated with the
analysis.
It will also have details regarding over-dutied equipment
and recommendations for protective device settings.
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When energized work is necessary, there
should be a specific safe work procedure.*
Energized work should be the last choice when it is not
feasible to de-energize the work location due to equipment
design or operation limitations.
*In accordance with OSHA CFR 1910 Subpart R or Subpart S and NFPA-70E-2015.
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Follow the OSHA regulations for employer
responsibility.
Determine who is qualified to work on energized electrical
equipment and outline the qualifications.
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The analysis report may identify locations
with high arc flash incident energy levels.
If it is not feasible to mitigate arc flash hazard at all
equipment, prioritize by reviewing operational goals and
identifying locations where interactions with the equipment
are frequent and prolonged.
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Work with your power system engineer to
develop a plan to mitigate the hazards
identified in "Step 4."
Implement recommendations for over-dutied equipment and
protective device settings that may have been identified.
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Invest in training for electricians,
maintenance personnel, site safety teams,
and facilities management teams.
Ask:
• Who is qualified to work on electrical equipment?
• Is my day-to-day operation going to be affected by our
renewed focus on electrical safety?
• What do I need to do to ensure my team is working
safely?
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Per NPFA-70E, electrical equipment likely to
require examination, adjustment, servicing
or maintenance while energized must be
field-marked with a label containing:
1. The nominal system voltage
2. The calculated arc flash boundary
3. The available incident energy and working distance as
calculated by the arc-flash-incident energy analysis
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In development of the electrical safety
policy, a PPE system needs to be
implemented based on the incident energies
calculated.
In the 2015 edition of NFPA-70E, there are no standard
PPE categories based on calculated incident energy.
*Table H.3(b) in NFPA-70E offers guidelines for selection of arc-rated clothing and other PPE when incident energy exposure is determined.
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The electrical equipment owner, or
designated representative, is responsible.
Improper maintenance can lead to increased operating
time, which could result in higher arc flash incident energy
than the values determined by arc flash analysis. If the
incident energy for an actual arc flash event is higher than
the incident energy calculated by the arc flash incident
energy analysis, the electrical worker may not be wearing
sufficient PPE.
10 essential steps to support arc flash
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Continuous improvement focuses on
removing stagnation and implementing
evolving processes and procedures.
Use this opportunity to ensure that equipment continuously
operates at peak performances, and to ensure safety
policies and procedures are updated and reviewed on a
regular basis.
10 essential steps to support arc flash
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