OSHA standard 1910.23 establishes the design, installation, and use requirements for all ladders in general industry workplaces in the United States. Located under Subpart D (Walking-Working Surfaces), the current version became effective January 17, 2017, replacing the previous 1910.23 and 1910.24. This guide focuses on the provisions applicable to fixed steel ladders — permanently attached vertical access ladders used in industrial facilities, commercial buildings, and infrastructure across the United States.
All Dengtai ladders shipped to US destinations are designed and manufactured to meet OSHA 1910.23 requirements, with full compliance documentation provided as standard.
Scope of OSHA 1910.23
OSHA 1910.23 applies to all ladders used in general industry, including portable ladders, fixed ladders, and mobile ladder stands. For fixed steel ladder purchasers and specifiers, the relevant sections are:
- 1910.23(b) — General requirements for all ladders
- 1910.23(d) — Fixed ladders (specific design and use provisions)
- 1910.23(l) — Load rating requirements
OSHA 1910.23 works in conjunction with OSHA 1910.27 (Scaffolds and rope descent systems) and OSHA 1910.28 (Duty to have fall protection). Together, these three standards define the complete fall protection framework for fixed ladder installations in US workplaces.
Key Requirements: 1910.23(d) — Fixed Ladders
1910.23(d)(1) — Clearance Requirements
The minimum perpendicular distance from the centerline of the rungs to the nearest permanent object behind the ladder must be 7 inches (178mm). The minimum clearance on each side of the ladder centerline must be 15 inches (381mm).
| Requirement | OSHA Minimum | Dengtai Standard |
|---|---|---|
| Rear clearance (centerline to wall) | 7 in (178mm) | 200mm (7.9 in) |
| Side clearance (each side of centerline) | 15 in (381mm) | 400mm (15.7 in) |
1910.23(d)(2) — Rung Width
Each rung must have a minimum clear width of 16 inches (406mm). Dengtai standard fixed and caged ladders use a 600mm (23.6 in) clear rung width, substantially exceeding the minimum. Heavy-duty models use 700mm (27.6 in). Cat ladders for the UK/Commonwealth use 500mm (19.7 in), which still exceeds the OSHA requirement.
1910.23(d)(3) — Rung Spacing
Rungs must be spaced not more than 12 inches (305mm) apart, center-to-center, and must be uniform throughout the climbing length of the ladder. Dengtai uses a standard 300mm (11.8 in) rung spacing — within the OSHA maximum and aligned with EN ISO 14122-4 and AS 1657 requirements for global compatibility.
1910.23(d)(4) — Cage, Well, or Ladder Safety System
This is the most frequently referenced clause and the one with the greatest compliance impact for US installations.
The rule: For fixed ladders that extend more than 24 feet (7.3m) above a lower level, the employer must ensure the ladder is equipped with a personal fall arrest system or a ladder safety system. Cages and wells are not considered ladder safety systems for installations made after November 19, 2018.
Critical compliance timeline:
| Date | Requirement |
|---|---|
| Before Nov 19, 2018 | Cages and wells were acceptable as fall protection on fixed ladders >24 ft |
| Nov 19, 2018 onward (new installations) | Fixed ladders >24 ft must have ladder safety system OR personal fall arrest system — NOT just a cage |
| Nov 19, 2036 (deadline) | ALL existing fixed ladders >24 ft must be retrofitted with ladder safety system or PFAS |
What this means for specifiers and purchasers:
- New US projects with ladders over 24 feet: You need a ladder safety system (vertical rigid rail or flexible cable with traveler engaged) or personal fall arrest system (full-body harness + lanyard + anchor point) as the primary fall protection. A cage alone is not compliant.
- Cages on new >24 ft ladders: A cage may be installed as supplementary protection alongside the required ladder safety system, but the cage is not the primary fall protection.
- Existing installations before Nov 19, 2018: Caged ladders currently in service remain compliant until the 2036 deadline, at which point all must be retrofitted.
For further analysis: Are Cage Ladders Being Phased Out? OSHA 2036 Explained ->
1910.23(d)(4)(i)-(iv) — Cage Dimensions (where cages are used)
Where cages are installed, the following dimensional requirements apply:
| Parameter | OSHA 1910.23(d)(4) Requirement | Dengtai Implementation |
|---|---|---|
| Cage inside diameter | 27-30 in (686-762mm) | 800mm (31.5 in) — adjustable to 700-750mm for US-spec |
| Cage bottom offset from base | 7-8 ft / 2,100-2,400mm per 1910.23(d)(4)(ii) | 2,200mm |
| Cage vertical bar spacing | Not more than 9.5 in (241mm) around circumference | 5 straps equally spaced (<9.5 in) |
| Cage top extension above landing | 42 in (1,100mm) minimum per 1910.23(d)(4)(iv) | 1,100mm+ |
Note: Dengtai’s standard 800mm cage diameter exceeds OSHA’s 27-30 inch range. For US-market installations specifically optimizing for OSHA compliance, we offer a 700-750mm cage diameter option. Contact engineering to specify the OSHA-optimized cage for US projects.
1910.23(d)(5)-(13) — Summary of Additional Requirements
| Clause | Requirement |
|---|---|
| (d)(5) | Grab bars: extend 42 in above landing on through-ladder installations |
| (d)(6) | Step-across distance: 2.5-12 in from centerline to roof edge (through ladders) |
| (d)(7) | Step-across distance: minimum 15 in (side-step ladders) |
| (d)(8) | Hatch cover must open with sufficient clearance for safe passage |
| (d)(9) | Ladder safety system post must be capable of supporting max intended load |
| (d)(10) | Ladders installed before Nov 19, 2018 must comply by Nov 19, 2036 |
| (d)(11) | Ladders used only for emergency evacuation exempt from fall protection |
| (d)(12) | Ladder sections must be offset with platforms at intervals not exceeding 50 ft |
| (d)(13) | Ladder extensions must not deflect under load that would disengage from landing |
1910.23(b) — General Requirements for All Ladders
| Clause | Requirement | Dengtai Compliance |
|---|---|---|
| (b)(1) | Rungs parallel, level, uniformly spaced | Rungs laser-aligned; 300mm ±2mm tolerance |
| (b)(2) | Rungs shaped to prevent slipping | 20mm round bar with anti-slip surface profile |
| (b)(4) | Ladder surfaces free of puncture/laceration hazards | All welds ground smooth; HDG coating free of sharp edges; SS brushed to 240# |
| (b)(6) | No metal ladders near energized electrical equipment | Specified in installation instructions; non-conductive ladder consultation available |
| (b)(8) | Ladder capable of supporting max intended load | Rated 300-450 lbs per model; tested to 500-750 lbs (1.67x safety factor) |
1910.23(l) — Load Rating
OSHA 1910.23(l)(1) requires that each ladder be capable of supporting, without failure, its maximum intended load. The standard does not specify a single numerical rating, but the industry interpretation adopted by ANSI A14.3 is a minimum of 300 lbs (136 kg) for heavy-duty industrial fixed ladders.
| Model Series | OSHA Rated Load | Static Test Load | Safety Factor |
|---|---|---|---|
| FL-HDG / CL-HDG (Q235B) | 300 lbs (136 kg) | 500 lbs (227 kg) | 1.67x |
| FL-SS / CL-SS (SS304/SS316) | 350 lbs (159 kg) | 580 lbs (263 kg) | 1.66x |
| HD Series (Q345B) | 450 lbs (204 kg) | 750 lbs (340 kg) | 1.67x |
Load test certificates are provided with every shipment and included in the compliance documentation package.
Relationship to Related OSHA Standards
OSHA 1910.23 does not operate in isolation:
| Standard | Scope | Interaction with 1910.23 |
|---|---|---|
| 1910.27 | Scaffolds and rope descent systems | Establishes 2036 timeline; defines ladder safety system requirements |
| 1910.28 | Duty to have fall protection | Requires fall protection at 4 ft (general industry); triggers cage/PFAS evaluation |
| 1910.29 | Fall protection systems criteria | Specifies guardrail dimensions, strength, and design for platforms |
| 1910.30 | Training requirements | Employer must train workers on ladder hazards and fall protection equipment |
For standards outside the US:
OSHA Compliance Checklist for Fixed Steel Ladders
Use this checklist when specifying or procuring fixed steel ladders for a US OSHA-regulated facility:
- [ ] Ladder height measured; PFAS/ladder safety system requirement determined (>24 ft triggers 1910.23(d)(4))
- [ ] Wall clearance >= 7 in (178mm) behind rungs per 1910.23(d)(1)
- [ ] Rung width >= 16 in (406mm) per 1910.23(d)(2) — Dengtai 600mm exceeds this
- [ ] Rung spacing <= 12 in (305mm) and uniform per 1910.23(d)(3) — Dengtai 300mm
- [ ] Top extension >= 42 in (1,100mm) above landing per 1910.23(d)(4)(iv)
- [ ] For new ladders >24 ft: ladder safety system or PFAS specified, not cage alone per 1910.23(d)(4)
- [ ] For existing ladders: retrofit plan in place before Nov 19, 2036 per 1910.23(d)(10)
- [ ] Load rating documentation available from manufacturer per 1910.23(l)
- [ ] Installation instructions include bracket spacing, anchor specifications, torque values
- [ ] Manufacturer Declaration of Conformity included in project documentation package
Download Printable OSHA Compliance Checklist (PDF) ->
Frequently Asked Questions
Can I use a cage instead of a ladder safety system on a new fixed ladder over 24 feet?
No. OSHA 1910.23(d)(4) explicitly requires a ladder safety system or personal fall arrest system — not a cage alone — as the primary fall protection for fixed ladders over 24 feet installed after November 19, 2018. A cage may be installed as supplementary protection alongside the required system, but does not independently meet the regulatory requirement. This is one of the most common compliance mistakes in US ladder procurement.
What is the November 19, 2036 deadline?
OSHA 1910.23(d)(10) requires that all existing fixed ladders over 24 feet, installed before November 19, 2018, must be retrofitted with a ladder safety system or personal fall arrest system by November 19, 2036. After this date, cages alone will not be acceptable as primary fall protection on any ladder over 24 ft in an OSHA-regulated workplace.
What documentation should my ladder supplier provide for OSHA compliance?
At minimum: (1) Declaration of Conformity stating the ladder was manufactured to meet OSHA 1910.23 requirements, (2) dimensional inspection report, (3) material certifications (mill test reports with heat number traceability), (4) weld quality records per ISO 5817 or AWS D1.1, and (5) load test certificate with test methodology and results. Dengtai provides all five documents as standard with every shipment. Any supplier who cannot provide these documents cannot demonstrate OSHA compliance.
How do I prepare for the November 2036 retrofit deadline?
Complete an inventory of all existing fixed ladders exceeding 24 feet at your facility. For each ladder, assess: current structural condition, suitability for retrofit (bracket capacity for ladder safety system loads), and compatibility with ladder safety system hardware. Budget retrofit costs in your capital planning cycle. For ladders in poor condition, replacement with a new OSHA-compliant ladder with integrated safety system may be more cost-effective than retrofitting an aging installation.
How do I verify a supplier’s OSHA compliance claims?
Request the five compliance documents listed above. A legitimate manufacturer provides these without hesitation. Verify that material certifications reference recognized steel grades (Q235B, Q345B, SS304, SS316 with chemical composition and mechanical properties). Confirm weld inspection references ISO 5817 or AWS D1.1 with Quality Level C or better. For load testing, review the test methodology as well as the results. Dengtai provides all documentation with the quotation on request.
Does OSHA 1910.23 apply outside the United States?
OSHA 1910.23 applies to workplaces under OSHA jurisdiction (US states and territories). For projects outside the US, follow the local standard — EN ISO 14122-4 (EU), AS 1657 (AU/NZ), BS 4211 (UK). However, many international projects, particularly US-funded or US-designed facilities (embassies, military bases, oil and gas), reference OSHA standards in their engineering specifications regardless of physical location.
Request an OSHA-Compliant Fixed Ladder
Dengtai fixed and caged ladders meet OSHA 1910.23 design and load requirements. Full compliance documentation included.
Email: sales@dtsteelladder.com
WhatsApp: +86 155 1187 9488
Request OSHA-Compliant Quote -> | Download Documentation Sample ->
</script>