1926.652(g): Trench Shield System Requirements
Employers must not load trench shields beyond their design and must install them so they cannot shift dangerously under sudden side loads. Workers must be protected from cave-ins when entering and exiting shields and must stay out of shields while they are installed, removed or moved vertically; digging up to 2 feet below the shield bottom is allowed only under the rule's listed conditions.
Key takeaways
- 1926.652(g) is part of OSHA's construction standards (29 CFR Part 1926, Subpart P).
- OSHA cited it 137 times in the last 3 years, in 122 inspections, with $813,168 in current penalties.
- 1 death is linked to inspections that cited this rule.
- Most citations: TX (13), IL (13), OH (12).
- Related part: 1926.652(g)(1) General (99 citations).
- Free 5-minute toolbox talk for your crew below.
In this article
What this rule covers
29 CFR 1926.652(g) ("Shield systems") is one requirement inside 1926.652 Requirements for protective systems, an OSHA construction standard (Part 1926, Subpart P). It includes 6 sub-paragraphs. 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
(g) Shield systems — 137 citations
(1) General. Open (g)(1) 99 citations
(i) Shield systems shall not be subjected to loads exceeding those which the system was designed to withstand. 1 citations
(ii) Shields shall be installed in a manner to restrict lateral or other hazardous movement of the shield in the event of the application of sudden lateral loads. Open (g)(1)(ii) 50 citations
(iii) Employees shall be protected from the hazard of cave-ins when entering or exiting the areas protected by shields. Open (g)(1)(iii) 44 citations
(iv) Employees shall not be allowed in shields when shields are being installed, removed, or moved vertically. Open (g)(1)(iv) 4 citations
(2) Additional requirement for shield systems used in trench excavations. Excavations of earth material to a level not greater than 2 feet (.61 m) below the bottom of a shield shall be permitted, but only if the shield is designed to resist the forces calculated for the full depth of the trench, and there are no indications while the trench is open of a possible loss of soil from behind or below the bottom of the shield. Open (g)(2) 38 citations
Source: eCFR, text current as of 2026-10-15. Read all of 1926.652.
Injuries linked to this rule
1 death is linked to inspections where OSHA cited 1926.652(g).
At 11:23 a.m. on September 24, 2024, Employee #1 was working inside a precast concrete manhole section that had been previously installed in an excavation. A second precast concrete manhole section, suspended above by rigging, came loose and fell approximately 9 feet. The falling load…
Where and how often it was cited
| Year | Citations |
|---|---|
| 2023 | 10 |
| 2024 | 46 |
| 2025 | 49 |
| 2026 | 32 |
Top states: TX (13), IL (13), OH (12), WI (9), IN (8)
Largest penalties
| Employer | Location | Penalty for this rule |
|---|---|---|
| SOUND CONSTRUCTION INC. | STAMFORD, CT | $165,514 |
| PYLES PLUMBING AND UTILITY CONTRACTORS, INC. | PERRY, GA | $79,048 |
| HURTADO CONSTRUCTION COMPANY | FULSHEAR, TX | $31,940 |
| ELDER CORPORATION | WAUKEE, IA | $28,126 |
| GEORGE & LYNCH, INC. | MILLSBORO, DE | $26,811 |
Free toolbox talk
A 5-minute crew talk on 1926.652(g), plus alerts when this rule changes. Free.
OSHA interpretation letters
- Allowable gap requirement between the trench shield and trench sides. (2013-03-11)
- Adjusting work practices to comply with cave-in protection requirements in §1926.652, Requirements for protective systems in excavations. (2005-07-29)
- Permissibility of installing a trench shield so that the top is flush with the surface. (2003-11-14)
- Trench shields must be installed to prevent lateral movement in a collapse. (1999-10-20)
- Design and use of trench boxes (1991-11-07)
Related parts of this rule
- 1926.652(g)(1) General 99 citations
- 1926.652(g)(1)(ii) 50 citations
- 1926.652(g)(1)(iii) 44 citations
- 1926.652(g)(2) Additional requirement for shield systems used in trench excavations 38 citations
- 1926.652(g)(1)(iv) 4 citations
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Trainers on Black Belt Safety: Marc Harvey, Dana Reyes
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Frequently asked questions
Can workers stay in a trench box while it is being moved?
No. Employees are not allowed in shields when they are being installed, removed or moved vertically.
Can we dig below the bottom of the trench box?
Up to 2 feet below the bottom of the shield, but only if the shield is designed for the full depth of the trench and there are no signs of soil loss from behind or below it.
Are workers protected getting in and out of the box?
They must be protected from cave-ins when entering or exiting the areas protected by shields.
About this page
Sources
- 29 CFR 1926.652 (eCFR), text current as of 2026-10-15
- U.S. Department of Labor enforcement data: OSHA inspections, citations and accident records, copied nightly; data as of 2026-10-20
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.