10 Essential steps to support arc flash incident energy analysis

© 2016 Eaton. All Rights Reserved..

10 essential steps to support arc flash incident energy analysis

© 2016 Eaton. All Rights Reserved.. 2

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.






Follow the OSHA regulations for employer

responsibility.

Determine who is qualified to work on energized electrical

equipment and outline the qualifications.






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.






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.






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?






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






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.






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.






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.






Learn more about arc flash

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10 Essential steps to support arc flash incident energy analysis