These letters provide guidance to clarify the application of an established OSHA standard, policy, or. 29 and a fixed guardrail system that leaves only one exposed side", as described in 29 CFR 1910. Being distracted by technical jargon and confused by the wording of OSHA 1910 can leave you paralyzed from addressing known issues. OSHA guardrail system requirements. OSHA observes that the proposed provision was framed in performance-oriented. , Labor §1910. Under its general requirements for machine guarding ( standard number 1910. 451(g)(4. 23(e)(2) and 1910. 28 (b) (1) (i) (A) Result (s) Document Type (s) 1. Guardrails need to have a minimum breaking strength of 200 lbs. 503 (a) (1) The employer shall provide a training program for each employee who might be exposed to fall hazards. 29(b)(3) Guardrail systems are capable of withstanding, without failure, a force of at least 200 pounds (890 N) applied in a downward or outward direction within 2 inches (5 cm) of the top edge, at any point along the top rail. 1910. 1053 Ladders (Construction) 8. 23(c)(1) states that “e very open-sided floor or platform 4 feet or more above adjacent floor or ground level shall be guarded by a standard railing (or the equivalent as specified in paragraph (e)(3) of this section) on all open sides. 2022. 4 - Amendments to this part. 1926. 1910. Loren Sweatt, Principal Deputy Assistant Secretary of Labor for Occupational Safety and Health. 23(e)(3)(v)(b)] When the 200-pound (890-N) test load is applied in a downward direction, the top rail. Each employee on a walking/working surface (horizontal and vertical surface) with an unprotected side or edge which is 6 feet (1. According to OSHA standard 1910. (standard no. Toeboards and handrails must comply with subpart D of this part. 1910. Each employee in aOSHA says that the guardrail you use should be 42” in height, with a mid-rail at the halfway point. 5” high. 28(b)(3)(iv)“Each employee is protected from falling into a ladderway floor hole or ladderway platform hole by a guardrail system and toeboards erected on all exposed sides, except at the entrance to the hole, where a self-closing gate or an offset must be used. Final Regulatory Text For the reasons set forth in the preamble, OSHA amends part 1910 of title 29 of the Code of Federal Regulations as follows: PART 1910--OCCUPATIONAL SAFETY AND HEALTH STANDARDS Subpart D--Walking-Working. According to OSHA 1910. Calculating Safe Mounting Distances for Safeguards | EHS Today. Watertown, SD 57201-3624. Any working surface 4 feet or higher must be protected with guardrails on all sides at least 42″ tall and have to withstand 200 pounds of force. 261 (a) (2) Standards incorporated by reference. Stilts may be used on a large area scaffold. 29(b) – states the specific requirements for the minimum and maximum height of guardrail systems. 1910. 28 (b) (13): “When work is performed less than 6 feet (1. 57(a)(8). S. Warehousing hazards are addressed in specific standards for general industry (29 CFR 1910). Cal-OSHA’s 1” tolerance only. [Note: for this section, the criteria and practices requirements for guardrail systems on scaffolds are contained in 29 CFR part 1926, Subpart L or 29 CFR 1915. When a forklift truck is used for lifting personnel on a secured safety platform with a guardrail to perform work at an elevated position, would an employer have to abide by OSHA standard 29 CFR 1910. If you need additional information, please contact us by fax at: U. " - 1910. This is the first OSHA requirement to be aware of. 1926. The employer must ensure guardrail systems meet the following requirements: (1) The top edge height of top rails, or equivalent guardrail system members, are 42 inches (107. , Labor §1910. 1926. onstrate the use of a guardrail or trav-el restraint system is not feasible, the work may be done without those sys-tems provided:. 23 (a) (2), which states, "every ladderway floor opening or platform shall be guarded by a standard railing with standard toeboard on all exposed sides (except at entrance to opening), with the passage through the railing. 68 (b) (6) (v) (a) Emergency landings shall be accessible from both the "up" and "down" rungs of the manlift and shall give access to the ladder required in subparagraph (12) of this paragraph. 23, Ladders; 1910. 120(e)(3)] 04/21/2021 - Interim. This section stipulates, in full detail, how guardrails and other safety barriers should be designed, installed, inspected, tested, and maintained in a manner that will prevent employees from falling. 1910. 29(b)(1) Provides an interpretation of the OSHA standards addressing fall protection in the electric power distribution industry, ( 29 CFR 1910. Section 1926. NextGen 3000 and KeeGuard freestanding railing. For guardrails, the General Industry regulations. 140. Based on its analysis. 502(g)(l)(iv) requires that the control line be connected on each side to a guardrail system or wall. 29 and their roof guardrail requirements, we've identified at least 4 areas of major concern for rooftop safety that would require a safety rail for roof system. Under §1910. Handrails, stair rail systems, and guardrail systems are provided in accordance with § 1910. was unnecessarily restrictive because a guardrail system around a 3-inch hole would require a 3-foot diagonal guardrail. 29 Fall Protection Systems and Falling Object Protection-Criteria and Practices >. 29 and a removable guardrail system on all exposed sides, except at the entrance to the stairway. 28, Fall Protection Systems. Amendments to this part. The top rail of the handrail must be a minimum of 42" [ref. ( 1) Handrails, stair rail systems, and guardrail systems are provided in accordance with § 1910. 28(c)(2)(ii) and (iv)], for new installation the height of a handrail shall be not less than 36 inches above the tread. 1917. 2m) or more above a lower level is protected from falling by one or more of the following guardrail systems; safety net systems; or. Occupational Safety and Health Administration 200 Constitution Ave NW Washington, DC 20210 1. S. The top edge height may exceed 45 inches (114 cm), provided the guardrail system meets all other criteria of paragraph (b) of this section. 29(f)(1)(iii)(A) The height of the stair rail system is not less than 36 inches (91 cm) and not more than 38 inches (97 cm) as measured at the leading edge of the stair tread to the top surface of the top rail (see Figure D-13 of this section); andEmergency lighting shall be provided at stairways and passageways or aisleways used by employees for emergency exit in case of power failure. OSHA 1910. 23 (b) (12) - Fall Protection Requirements for Fixed Ladders - 09/10/2021. 1910. OSHA considers this scenario a violation of 29 CFR 1926. 23, entitled "Guarding Floor and Wall Openings and Holes. 6]Guarding Floor and Wall Openings and Holes — OSHA Standard 1910. 1926. 7 m). 28(b)(6)). 500 NOTICE: This is an OSHA Archive Document, and may no longer represent OSHA Policy. (i. 6 m) from the roof edge, the employer must ensure each employee is protected from falling by a guardrail system. S. OSHA 1910. They must specifically cite the source policy or procedure document they interpret. If the top of a tank is not a "platform" under the analysis called for in OSHA's guidance document, the guardrail requirements of that standard would not apply. When the hinged cover for an opening is left up, there are sides exposed which must be appropriately protected. 17 (e) When employees are working in, on, or under a railcar, positive means shall be taken to protect them from exposure to impact from moving railcars. 333 – Selection and Use of Work Practices. Top rail: The top rail of a guardrail system. 1423 (b) (1) Equipment manufactured after November 8, 2011 with lattice booms must be equipped with walkways on the boom (s) if the vertical profile of the boom (from cord centerline to cord centerline) is 6 or more feet. 1926. Please refer to OSHA's Frequently Cited OSHA Standards page for additional information. e. 72 kg) applied within 2 inches (5. OSHA eTool. Guardrail systems: Guardrails should be placed around edges or openings where workers could fall. 29 (b) (1): The top edge height of top rails, or equivalent guardrail system members, are 42 inches (107 cm), plus or minus 3 inches (8 cm), above the walking-working surface. of force from any direction; Three sizes: 8’ Door, Est. 28(b)(15), employees who work on surfaces that are 4 feet (1. • Check to see that a guardrail system is in place before working on the scissor lift. 48 (b). Share. 29 (f) (1) (i)) (as measured at the leading edge of the stair tread to the top surface of the rail). 29, qualifying as a passive barrier between the worker and the fall hazard. Schlekeway: Thank you for your March 17, 2017, letter on the Occupational Safety and Health Administration’s (OSHA) final rule revising and updating the general industry Walking-Working Surfaces and Personal Protective Equipment (Fall Protection Systems) standards (29 CFR part 1910, subparts. As an employer, it is your responsibility to ensure all workers have adequate fall protection and falling object protection including handrails, stair rail systems, and guardrail. 269?from falling by a guardrail system, a safety net system, or a personal fall arrest system. [IBC 1011. 6 m) above a lower level shall be protected from fall hazards by guardrail systems, safety net systems, personal fall arrest systems, positioning device systems or. If questions of concerns beyond the scope of the standard, consult with your safety representative . 29 (b) (1) The top edge height of top rails, or equivalent guardrail system members, are 42 inches (107 cm), plus or minus 3. 500, Guardrails, handrails & guards. Pursuant to §1910. Darmstadter: This is in response to your letter of February 6, 1976, with attachments, regarding an exception from 29 CFR 1910. Personnel baskets should be equipped with a guard rail that encompasses the entire rim of the basket. OSHA 1910. 23 Ladders §1910. 28(b)(15), for instance, employees working on surfaces 4 feet or more off the ground must be protected by handrails, safety net systems, or personal fall protection. 67 – Vehicle-mounted elevating and rotating work platforms; 1910. Petitions for the issuance, amendment, or repeal of a standard. 23(e)(1) – A standard railing shall consist of a top rail. Open riser:. Department of Labor. Hole means a gap or void 2 inches (5. 28(b)(1)(i), in general workplaces, employers must ensure that any employee working on a surface with an unprotected side or edge that is four feet (1. The employer must ensure guardrail systems meet the following requirements: 1910. 04/16/2018 - Regarding guardrail systems and fall protection requirements to scaffold systems, including form scaffolds. 29: 29 CFR 1910. OSHA 1910. 28. 28(b)(13)(iii)(A), when work is performed 15 feet or more from the roof edge, each employee must be protected from falling by a guardrail system, a safety net system, a travel restraint system, personal fall arrest system, or a designated area. Body belt (safety belt) means a strap with means both for securing it about the waist and for attaching it to a lanyard, lifeline, or deceleration device. 29(f)(1) Handrails and stair rail systems; Height criteria, OSHA did not intend for any of the ``grandfathered'' stair rail systems that had a top rail height between 30 and 38 inches to need to be modified if the stair rail system was installed before January 17, 2017, and it complied with the previous rule. The top rail rail must be able to withstand 200 pounds of force in the downward and outward directions. The employer must ensure guardrail systems meet the following requirements: 1910. Labor Day: A Celebration Of Hard Work. 1926. 28 - Duty to Have Fall Protection and Falling Object Protection, and we see that section 1910. ( ii) Stairways shall be equipped with rigid and substantial metal handrails. TOTAL VIOLATIONS. With respect to § 1910. 25(b)(2) Vertical clearance above any stair tread to any overhead obstruction is at least 6 feet, 8 inches (203 cm), as measured from the leading edge of the tread. 1910. Handrails and the top rails of stair rail systems are capable of withstanding, without failure, a force of at least 200 pounds (890 N) applied in any downward or outward direction within 2 inches (5 cm) of any point along the top edge of the rail. OSHA 1910. Section 1910. 29(f)(1) Handrails and stair rail systems; Height criteria, OSHA did not intend for any of the ``grandfathered'' stair rail systems that had a top rail height between 30 and 38 inches to need to be modified if the stair rail system was installed before January 17, 2017, and it complied with the previous rule. OSHA-S041-2006-0666 (formerly Docket No. [Content_Types]. Top 10 standards cited as “serious,” fiscal year 2022. 23(e)(2) and 1910. ”Updated scaffold requirements (§1910. Gates that meet OSHA 29 CFR 1910. 28(b)(3)). 29(f)(1)(iii)(A) allows the top rail of a stair rail system to serve as a handrail when the stair rail system is not less than 36 inches (91 cm) and not more than 38 inches. 28 and 1910. For more information, visit or call OSHA at 1-800-321-OSHA (6742), TTY 1-877-889-5627. 15 (a) Adoption and extension of established safety and health standards for shipyard employment. If you need further assistance, please contact [the Office of General Industry Enforcement at (202) 693-1850]. To be OSHA compliant, they must be 42 inches (1. OSHA 1910 Occupational Safety and Health Standards > D Walking-Working Surfaces > 1910. Haydl: This is in response to your letter of June 24, 2004 regarding the Occupational Safety and Health Administration (OSHA) standards for heights for stair rails and handrails and corresponding building code requirements. 23(e)(1) – A standard railing shall consist of top rail, intermediate rail, and posts, and shall have a vertical. A guardrail, or guard rail, is a stationary, fixed fall protection system designed to prevent workers from stepping over the edge of a walking-working surface. In addition, if the guardrail has intermediate vertical members (uprights. Theatre galleries, balconies, or other such elevated seating locations, where a 42-inch railing would obstruct the sight lines, may be protected by a guardrail or other barrier of not less than 34 inches in height provided that a horizontal concave safety ledge not less than 6 inches in depth and not less than 36 inches in effective width is installed beyond the. 05 m) or less in overall length, and shall increase at least¼ inch (0. In addition, Section 5 (a) (1) of the Occupational Safety and Health (OSH) Act, often referred to as the General Duty Clause, requires employers to "furnish to each of his employees employment and a place of employment which are free from recognized. 8. 23(c)(1) , Protection of Open-sided Floors, Platforms and Runways; Guardrails--Loading Rack Platforms. 1910. 26, Dockboards;. 212 ), OSHA. TO: ALL AREA DIRECTORS Paragraph 1926. 1910. This section does not apply to logging and the transportation of logs to pulp, paper, and paperboard mills. 28(b)(3)(iv) UNPROTECTED EXTENSION LADDER - OSHA 1918. When the hole is not in use, the employer must ensure the cover is closed or a removable guard-rail system is provided on the exposed sides; (B) A removable guardrail system and toeboards on not more than two sides of the hole and a fixed guardrailOSHA 1910. The employer must ensure each. 8 (Loads on Handrails, Guards, Grab Bars, Seats and Vehicle Barriers). We hope you find this information helpful. Meets OSHA Requirements 1910. One of these requirements is that the toprail be at least 1/4-inch. Regulations. Department of Labor, OSHA, Directorate of Construction, [Office of Construction Standards and Guidance], fax # 202-693-1689. In accordance with 29 CFR § 1910. OSHA 1910. If a climber safety rail is not installed, use a double lanyard configuration. 23(e)(1), which otherwise requires a nominal vertical height of 42 inches. Subject: 29 CFR 1910. Hazards are identified, as well as the controls that keep these hazards from becoming tragedies. No need to shut these gates behind you— springs automatically do it for you. 6 m) from the roof edge, the employer must ensure each employee is protected from falling by using a guardrail system, safety net system, travel restraint system, or personal fall arrest system. Safety Rail Source® products are designed to meet or exceed all OSHA Standards. 44 FR 8577, Feb. Response: 29 CFR 1910. a or call OSHA at 1-800-321-OSHA (6742), TTY 1-877-889-5627. 6 - Incorporation by reference. That part of §1910. Nearly all industrial equipment requires human interaction to function, so people need to be protected from dangerous interactions with machines. 08 cm) of the top, all along the rail. ¢YPvdK þõÕ ˜ÉÇÔz_Wîô†D«¹ï}ÞÜW†šúIVÚ—çE«Åƒ†v“êB» d³Ö(«Qy¥Ý¦€Ô IÓ. 23 is part. Sets forth safety requirements for areas where danger exists of persons or objects falling through floor or wall openings, platforms, runways, ramps, and fixed stairs, in normal, temporary. 252, General requirements. S. 1910. The IBC and OSHA Guardrail Requirements. OSHA published a final rule on walking-working surfaces and personal protective equipment in November 2016 that updated requirements for slip, trip and fall hazards. Bottom Diagonal Brace, Four Cross Braces, Four End Frames, Guardrail Posts, Guardrail/Midrail, Midside Rail, Toeboard, Top Rail: OSHA Compliant 29 CFR 1926. (3) Guardrail systems are capable of withstanding, without failure, a force of at least 200 pounds (890 N) applied in a downward or outward direction with-in 2 inches (5 cm) of the top edge, at any point along the top rail. 29 is the Federal Standard for General Industry Guardrail Systems, which our Safety Railings are compliant of. 140, OSHA adopts the flexible approach to providing fall protection systems that the construction standard codified in 1994. 23(d)(5): For through ladders, the steps or rungs are omitted from the extensions,. 503 (a) Training program. Railings can pivot in 45° increments. Response: 29 CFR 1910. Accordingly, proposed paragraph 1910. 23(e)(1) as referenced by 1910. 29(b). OSHA scaffold regulations recommend that your scaffolding include a guard rail across the base, mid rails and top of any scaffolding more than 10 feet in height. ( c) Safety net systems. 1926. OSHA maintains a listing of the most frequently cited standards for specified 6-digit North American Industry Classification System (NAICS) codes. Additional OSHA Code Detail: 1910. 1910. SUBJECT: 1926. The employer must ensure each safety net system meets the requirements in 29 CFR part 1926, subpart M. Final Regulatory Text For the reasons set forth in the preamble, OSHA amends part 1910 of title 29 of the Code of Federal Regulations as follows: PART 1910--OCCUPATIONAL SAFETY AND HEALTH STANDARDS Subpart D--Walking-Working Surfaces 1. See solutions to OSHA requirements. On commercial roofs, HVAC units typically are located near the center of the roof, which may. 1910. 1910. OSHA’s 29 CFR 1910. 1. 24 (arranged alphabetically by the respective paragraph) Handrail: a single bar or pipe supported on brackets from a wall or partition to provide a continuous handhold for persons using a stair. 1052) GENERAL INDUSTRY Every open-sided floor, platform or runway 4 feet or more. This Safety and Health Information Bulletin is not a standard or regulation, and it creates no new legal obligations. Under the proposal [proposed §1910. 29 (b): "Fall protection systems and falling object protection -- criteria and practices. NO. This includes indoor and outdoor construction, water tower repairs, shipyard work – anywhere scissor lifts are used. OSHA considers a roof hatch to be a hole in a roof (OSHA 29 CFR 1910. 23, OSHA Compliant 29 CFR 1926. e. 1910. 1 cm) or more in its least dimension, in a floor, roof, or other walking/working surface. " Full text of this standard is available online at It states that, "every ladder-way, floor opening, or platform shall be guarded by a standard railing with standard toe. Cal OSHA requires a maximum single rail length of 8 feet. For example, in final §§ 1910. Background II. OSHA Guardrail Dimensions. in any direction per OSHA 1910. 28. The following is a list of the most commonly referenced sections which are addressed by our products and services, including guardrail systems, anchor points and more:In OSHA's words: "Guardrail systems are capable of withstanding, without failure, a force of at least 200 pounds applied in a downward or outward direction within 2 inches (5 cm) of the top edge, at any point along the top rail. EDGE Fall Protection’s roof hatch railing tackles concerns by providing an OSHA compliant hatch guardrail system around the hatch. OSHA; Standards; Enforcement; Topics; Media Center; Contact Us; U. (1910. Under the proposal [proposed §1910. Answer: No. 23(e)(6), and the posts and brackets are not required to have a clearance of not less than 3 inches between the top rail or handrail, respectively. First, several stakeholders contend that guardrail systems, safety net systems, and personal fall protection system are not feasible in those locations. 28(b)(13)(i) requires that “each employee is protected from falling by a guardrail system, safety net system. Occupational Safety and Health Administration 200 Constitution Ave NW Washington, DC 20210 1-800. Figure D-13 - Combination Handrail and Stair Rail. "The standard authorizes a guardrail but nothing else. 27, depending on the type of ladder used to access the scaffolding. or more above a lower level shall be protected from falling by the use of guardrail systems, safety net systems, or personal fall arrest. 29 (b) (1) The top edge height of top rails, or equivalent guardrail system members, are 42 inches (107 cm), plus or minus 3 inches (8 cm), above the walking-working surface. 29(b) is the portion of the regulations that contains system requirements that employers must follow to ensure guardrail systems will protect workers from falling to lower levels. Midrails, screens, mesh, and other. Subpart A General. 5 - Applicability of standards. The April 10, 1990 proposed OSHA standard, 29 CFR 1910. 30. 6 m) from the roof edge, the employer must ensure each employee is protected from falling by a guardrail system, safety net system, travel restraint system, or personal fall arrest system. 1910. They require “employers to provide protection for each employee exposed to fall and falling object hazards. 9. 451 (b) (3) (ii) The maximum distance from the face for plastering and lathing operations shall be 18 inches (46 cm). 29(b)(1) 1910. 27(a)). 29 CFR Parts 1910 and 1926. Dear Mr. 1926. 1910. In accordance with 29 CFR § 1910. The SkyCage Fence Panel is available in 4’, 6’, and 9’ lengths. 5303. ( c) Safety net systems. 26 (b) (2)OSHA has proposed revising the requirements of 29 CFR Subpart D, of which §1910. Scroll to Top. As required by §§ 1910. OSHA eTool. 21 (b) Ladder safety system means a system designed to eliminate or reduce the possibility of falling from a ladder. 29(b) – states the specific requirements for the minimum and maximum height of guardrail systems. The construction and proposed general industry Walking-Working Surfaces rule fall protection standards require that employers protect workers from falling into or onto dangerous equipment by use of a guardrail, safety net, travel-restraint or personal fall arrest system (Sec. The manufacturer must approve any alterations to the stilts. ( ii) Each employee using a rope descent system 4 feet (1. According to OSHA, “Falls are the leading cause of work. Question 9: What training is required for fall protection and associated rescue under §1910. 28; 1910. 28(c)(3), published in the Federal Register, Volume 55, Number 69 on Tuesday, April 10,1990, requires that the minimum finger clearance between handrails, including the top edge of stair rail systems serving as handrails, and any obstructions shall be one and one-half inches. 1910. Within OSHA 1910. 1910. The rail’s height. 1910. 1910. 8 m) or more above a lower level shall be protected from falling by the use of guardrail systems, safety net systems, or personal fall arrest systems. 28(c)(2)(iv)], a stair rail may also serve as a handrail if its height is not more than 37 inches nor less than 36 inches. Additionally, the new rule states that openings between top and midrail. 501(b)(8), proposed Sec. 93)OSHA stipulates that employers are responsible for reviewing safety regulations before basket lifting starts as well as notifying/training new workers on safety regulations whenever they join a job location. The employer must ensure: (i) Each employee is protected from falling through any hole (including skylights) that is 4 feet (1. 68 (b) (6) (v) (b) Emergency landings shall be completely enclosed with a standard railing and toeboard. S-206] Safety Standards for Fall Protection in the Construction Industry. (d) Designated areas. OSHA 1910. 64 cm) for each additional 2 feet. Please review the full code for further information. 1. 23 (b) General requirements for all ladders. 2023. KeeGuard ® Rooftop Railing was invented by Kee Safety decades ago and is installed on rooftops around the world. OSHA Standard Number 1910. 3 October 30, 1978. 29 (b) (1): To meet OSHA’s guardrail height requirements, the top rail needs to be 42 inches plus or minus 3 inches above the walking-working surface. 21 (b) Definitions . Per OSHA 1910. TO: REGIONAL ADMINISTRATORS/OSHA. 176 (a) Use of mechanical equipment. 22(a)(3): Walking-working surfaces are maintained free of hazards. Occupational Safety and Health Administration (OSHA) has released an updated hazard alert that highlights specific hazards present in workplaces where scissor lifts are used, and defines specific controls employers must implement to prevent incidents. > >. 62 cm) above the walking surface. STANDARD. C. Occupational Safety and Health Administration 200 Constitution Ave NW Washington, DC 20210 1-800-321-OSHA 1. 5 inches (24 cm); ( 3) Have a minimum tread depth of 9. 28(b)(9)(ii)(B) requires that ladders equipped with a personal fall protection or a ladder safety system shall have rest platforms provided at maximum intervals of 150 feet (45. Employees that are more than 10 feet off the ground need to be protected by using fall arrest systems or guardrails, except for employees that are on single-point and two-point adjustable suspension scaffolds. A handrail is a rail mounted to a wall to furnish people a handhold to prevent tripping and falling down the stair. Any working surface 4 feet or higher must be protected with guardrails on all sides at least 42" tall and have to withstand 200 pounds of force. These letters provide guidance to clarify the application of an established OSHA standard, policy, or procedure, but they may not, in themselves, establish or revise OSHA policy or procedure or interpret the OSH Act. 1910. However, it requires that the stair landings be at least the width of the stair or 48 inches, whichever is less. These letters provide guidance to clarify the application of an established OSHA standard, policy, or. Section 1910. 28 and 1910. 501(b)(1), which provides that "[e]ach employee on a walking/working surface. for this section, the criteria and practices requirements for guardrail systems on scaffolds are contained in 29 CFR. 28(b)(3)(v): “Each employee is protected from falling through a hatchway and chute-floor hole by: a hinged floor-hole cover that meets the criteria in 29 CFR 1910. OSHA 1910. ”. General requirements —. Narrow Frame Scaffolds. 29 (b) (1) The top edge height of top rails, or equivalent guardrail system members, are 42 inches (107 cm), plus or minus 3 inches (8 cm), above the walking-working surface. 1910. 29(b)(4)[1910. This code (OSHA 1910. OSHA's standards contain requirements for NRTL product testing and certification for 39 product types. Related Products.