Arc Flash Reference

Data record gloss.arc-flash-boundary.osha1910-269.burn-injury-level

Verified 2026-10-28 Confidence: High

Appendix E to 29 CFR 1910.269 explains that arc-rated protection is not required for exposures at or below the threshold of the section's protective clothing rule, because untreated cotton clothing reduces such an exposure below the level of heat energy, given in the datum value, at which burn injury begins, and should not ignite at that level. The explanation sits in section III.B of the appendix.

Value: 1.2 to 1.5 cal/cm2

Provenance29 CFR 1910.269 supports data record gloss.arc-flash-boundary.osha1910-269.burn-injury-level, which is cited on the entry Arc flash boundary.SOURCE29 CFR 1910.26929 CFR 1910.269Regulation, clause Appendix E, III.BDATA RECORDgloss.arc-flash-boundary.osha1910-269.burn-injury-levelgloss.arc-flash-boundary..Verified 2026-10-28ENTRYArc flash boundaryArc flash boundaryNo revisions
Provenance. Where this record comes from and where it is used: the cited source, the record itself and the entry that cites it.
Provenance: the chain from source to entry.
StepItemDetail
Source29 CFR 1910.269Regulation, clause Appendix E, III.B
Data recordgloss.arc-flash-boundary.osha1910-269.burn-injury-levelVerified 2026-10-28
EntryArc flash boundaryNo revisions
Subject
Arc flash boundary (Glossary)
Kind
Standard scope
Source
29 CFR 1910.269, current edition, clause Appendix E, III.B, 1910.269 - Electric power generation, transmission, and distribution (with Appendices A to G; Appendix B, Working on Exposed Energized Parts), OSHA. Regulation text. Agency copy of 29 CFR 1910.269
Also stated in
  • 29 CFR 1910.269, Appendix E, section III.B (eCFR current as of 2026-10-26).
    Read the reference passage
    "Paragraph (l)(8)(v) of § 1910.269 does not require arc-rated protection for exposures of 2 cal/cm2 or less. Untreated cotton clothing will reduce a 2-cal/cm2 exposure below the 1.2- to 1.5-cal/cm2 level necessary to cause burn injury, and this material should not ignite at such low heat energy levels."

    29 CFR 1910.269, Appendix E, section III.B, eCFR current as of 2026-10-26. Agency copy of 29 CFR 1910.269

    The current standard governs; this passage is a public-domain description of the practice dated eCFR current as of 2026-10-26.

Beside
gloss.arc-flash-boundary.nfpa70e.definition

History

Every recorded change to this data record, oldest first.
DateChange
2026-10-28created

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Cite the governing standard for the fact itself; cite this page as the finding aid.

"Data record gloss.arc-flash-boundary.osha1910-269.burn-injury-level." Arc Flash Reference. 2026-10-28. https://www.arcflashreference.com/data/gloss.arc-flash-boundary.osha1910-269.burn-injury-level/.