Arc flash boundary
Updated 2026-10-27
Data records
- Article 100 of NFPA 70E-2027 defines the arc flash boundary, where an arc flash hazard exists, as the approach limit at which the incident energy equals the threshold value the definition states, the same value clause 130.5(E) uses for the incident energy analysis method.
- Clause 130.5(E) of NFPA 70E-2027 locates the arc flash boundary either by incident energy analysis or from the PPE category tables of clause 130.7(C)(15); clause 130.4(E) makes it independent of the shock protection boundaries, so it may be larger than the limited approach boundary, and clause 130.5(H) puts it on the equipment label.
Sources
- NFPA 70E-2027, Standard for Electrical Safety in the Workplace, 2027 edition, NFPA. Cited: clause Article 100; clause 130.5(E). Held as: Purchased single-user copy. Publisher page for NFPA 70E-2027
Obtaining the documents
- NFPA 70E-2027: available from the publisher
Changelog (2 entries)
| Date | Revision | Change |
|---|---|---|
| 2026-10-27 | created (gloss.arc-flash-boundary.nfpa70e.definition) | |
| 2026-10-27 | created (gloss.arc-flash-boundary.nfpa70e.determination) |
Cite this page
Cite the governing standard for the fact itself; cite this page as the finding aid.
"Arc flash boundary." Arc Flash Reference. 2026-10-27. https://www.arcflashreference.com/glossary/arc-flash-boundary/.
Arc Flash Reference, Arc flash boundary (Oct. 27, 2026), https://www.arcflashreference.com/glossary/arc-flash-boundary/.
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title = {Arc flash boundary},
howpublished = {\url{https://www.arcflashreference.com/glossary/arc-flash-boundary/}},
organization = {Arc Flash Reference},
publisher = {Arc Flash Reference},
year = {2026},
note = {last substantive change 2026-10-27}
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