NFPA 70E

mshields

Senior Member
Location
Boston, MA
In the 2018 NFPA 70E, I note that Table 130.7(C)(15)(c), defining PPE for categories 1- 4, is only for use if the PPE Category is determined via the (a) or (b) tables that precedes it and not for use where incident energy has been calculated.

And that in the event that incident energy analysis method is used, one uses table 130.5(G) to determine PPE. And that there are only two categories in this table.

So if one uses SKM or one of the other programs to do a combination Short Circuit, Coordination and Arc Flash analysis, are the PPE categories 1 - 4 no longer relevant. And how does Table 130.5(C) giving the likelihood of arc flash occurence for varying tasks given varying equipment conditions fit into what PPE is required?
 

paulengr

Senior Member
You use Annex H and dress to the calculated cal/cm2, NOT PPE level. Using the ATPV on the PPE table is reading it backwards.

This is more flexible. So if you calculate say 9 cal/cm2 and your shirt and pants are ATPV 10, you are good to go if you wear the rest of the PPE. If you used the table backwards you’d be at level 3.
 

jim dungar

Moderator
Staff member
Location
Wisconsin
Occupation
Engineer
So if one uses SKM or one of the other programs to do a combination Short Circuit, Coordination and Arc Flash analysis, are the PPE categories 1 - 4 no longer relevant. And how does Table 130.5(C) giving the likelihood of arc flash occurence for varying tasks given varying equipment conditions fit into what PPE is required?
NFPA70E allows 'site specific' PPE selection in addition to the 2 levels suggested for use when the incident energy level has been calculated. This allows companies to continue to select PPE based on existing company policies

The likelihood of an arc flash occurring and the incident energy are two separate and independent assessments that must be made.
 

topgone

Senior Member
NFPA70E allows 'site specific' PPE selection in addition to the 2 levels suggested for use when the incident energy level has been calculated. This allows companies to continue to select PPE based on existing company policies

The likelihood of an arc flash occurring and the incident energy are two separate and independent assessments that must be made.
Thanks. I like it when issues are clearly explained!
 
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