1910.269(l)(3)(ii): OSHA rule
Key takeaways
- 1910.269(l)(3)(ii) is part of OSHA's general industry standards (29 CFR Part 1910, Subpart R).
- Related part: 1910.269(l) Working on or near exposed energized parts (75 citations).
- Free 5-minute toolbox talk for your crew below.
In this article
What this rule covers
29 CFR 1910.269(l)(3)(ii) is one requirement inside 1910.269 Electric power generation, transmission, and distribution, an OSHA general industry standard (Part 1910, Subpart R). The official text below is copied word for word from the Electronic Code of Federal Regulations (eCFR). The numbers, injury cases and training on this page show how OSHA enforces it on real job sites.
Official text
(ii) No later than April 1, 2015, for voltages over 72.5 kilovolts, the employer shall determine the maximum anticipated per-unit transient overvoltage, phase-to-ground, through an engineering analysis or assume a maximum anticipated per-unit transient overvoltage, phase-to-ground, in accordance with Table R-9. When the employer uses portable protective gaps to control the maximum transient overvoltage, the value of the maximum anticipated per-unit transient overvoltage, phase-to-ground, must provide for five standard deviations between the statistical sparkover voltage of the gap and the statistical withstand voltage corresponding to the electrical component of the minimum approach distance. The employer shall make any engineering analysis conducted to determine maximum anticipated per-unit transient overvoltage available upon request to employees and to the Assistant Secretary or designee for examination and copying.
See appendix B to this section for information on how to calculate the maximum anticipated per-unit transient overvoltage, phase-to-ground, when the employer uses portable protective gaps to reduce maximum transient overvoltages.
Source: eCFR, text current as of 2026-10-15. Read all of 1910.269.
Free toolbox talk
A 5-minute crew talk on 1910.269(l)(3)(ii), plus alerts when this rule changes. Free.
OSHA interpretation letters
- Extended enforcement dates for minimum approach distances to electrical power lines (2016-01-20)
- Conditions allowing the use of insulating gloves without the use of insulating sleeves when working on or near exposed energized parts. (2006-09-01)
Related parts of this rule
- 1910.269(l) Working on or near exposed energized parts 75 citations
- 1910.269(l)(3) Minimum approach distances 28 citations
- 1910.269(l)(3)(iii) 26 citations
- 1910.269(l)(8) Protection from flames and electric arcs 18 citations
- 1910.269(l)(1) General 13 citations
- 1910.269(l)(8)(v) 9 citations
- 1910.269(l)(1)(ii) 6 citations
- 1910.269(l)(5) Working position 6 citations
- 1910.269(l)(1)(iii) 5 citations
- 1910.269(l)(3)(iii)(A) 5 citations
- 1910.269(l)(5)(ii) 5 citations
- 1910.269(l)(2) At least two employees 4 citations
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About this page
Sources
- 29 CFR 1910.269 (eCFR), text current as of 2026-10-15
- U.S. Department of Labor enforcement data: OSHA inspections, citations and accident records, copied nightly
3-year window. Federal OSHA only; state-plan rules are not counted. Plain-language text is a summary, not legal advice; the official text controls. Black Belt Safety is not part of OSHA or the Department of Labor.