ANSI A - Download as PDF File .pdf), Text File .txt) or read online. Standards PDF Cover Page Document preview. Historical. ANSI ASC A American National Standards Add to Alert; PDF. Add to Alert. ×. Please first. ANSI-ASC A Ladders - Fixed - Safety Requirements. Format. Details. Price (USD). Secure PDF. Single User ANSI/ISEA Z
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industry standard 29 CFR (b) and (d) and ANSI A Standard – Safety Requirements for fixed ladders. For the required material used in manufacturing. ANSI A Ladders--Portable Metal--Safety AI4-I, Portable Wood Ladders; AI, Portable Metal Ladders; AI, Fixed Ladders. Fixed ladders shall be procured to meet the requirements of OSHA 29 CFR and/or ANSI A whichever is more stringent.
Live loads imposed by persons shall be as follows: That part of a ladder safety device consisting of the moving component with locking mechanism that travels on the carrier and makes the connection between the carrier and the safety belt.
A rail ladder that requires a person getting off at the top to step through the ladder in order to reach a landing. Each step or rung in the ladder shall be designed for a single concentrated live load of pounds minimum. The weight of the ladder and attached appurtenances shall be considered simultaneously with the live loads in the design of rails.
The vertical spacing of steps and rungs shall not exceed 12 inches on centers. Materials other than steel. Design Details for Fixed Ladders 5. The weight of the platform and attached appurtenances. Aluminum laders and platforms shall be designed and fabricated in accordance with the applicable requirements of AA SAS The minimum inside clear width of step surface for steps and rungs shall be 16 inches. The design of fured ladder systems shall be under the general supervision of a qualified registered licensed structural or professional engineer or architect.
The following are general requirements for the minimum size of steps and rungs: Higher strength steels may be used. The minimum sizes cross sections of steps and rungs fabricated of steel conforming to ASTM Aa shall be as follows: Steel ladders and platforms shall be designed and fabricated in accordance with the applicable requirements of AISC S Portable aluminum ladders may be adapted for use as fixed ladders provided they meet all the requirements of ANSI A The minimum size of aluminum structural components shall be determined in accordance with the provisions of AA SAS Stepand rung-type ladders of steel.
The minimum size recommended for steel may be modified by a factor that shall be the ratio of the allowable unit stress for steel conforming to ASTM Aa to the allowable unit stress for the type and shape of other metal s used. The recommended minimum sizes cross section of side rails fabricated of steel conforming to ASTM Aa are as follows: The ends of each rung shall have proper configuration and sufficient embedment in the supporting wall to fully develop the design loads imposed on the rung see Fig.
In cases where the ladders are subjected to corrosive atmospheric exposure or placed in contact with dissimilar materials. The ends of each rung shall have the proper configuration and sufficient means of attachment to the supporting structure to fully develop the design loads imposed on the rung.
Variations in size cross section shall be permitted provided the section properties are adequate to support the design loads and are consistent with the maximum spacing of supports. The minimum size cross section as specified in 5. Splices shall be made at intermediate supports only if the type of material used requires that location.
The following are general re- a uniform gripping surface for the hands of persons using the ladders. The maximum spacing of supports for fastening the side rails to the structure. For a parapet ladder.
For additional design loads or attachment of ladder safety devices. Sharp or extensive projections shall not be permitted. If the normal step-across distance exceeds 12 inches.
The top of a step or rung continuation of the rung spacings as horizontal grab bars or by providing vertical grab bars that shall have the same lateral spacing as the vertical legs of the rungs see Fig.
The top rung of the ladder may also be located below the top of the hatch to provide required clearance for the hatch cover see Fig. Where ladder safety devices are provided.
This will give a maximum spacing.
The inside of the cage shall be clear of projections. An example of cage construction is shown in Fig. Lightning protection. The inside clear width of the well shall be a nominal 30 inches see Fig.
All fixed ladders shall be designed to minimize the accumulation of moisture so as to help reduce corrosion on metal ladders or rot of wood ladders. For variations in size cross section and spacing of vertical bars. The total depth of the platform shall provide a minimum space of 30 inches from 6.
The bottom of the cage shall be flared not less than 4 inches all around within the distance between the bottom horizontal band and the next higher band see Fig. The inside of the well shall be clear of projections see Fig.
Wood ladders shall normally be treated with a nonirritating preservative suitable for the service. Ladder Safety Devices 7.
Protective Finishes 8. When different types of materials are used in the construction of fixed ladders.
It shall permit the person using the ladder safety device to ascend or descend without having to continually manipulate the safety sleeve.
Ladder safety devices utilizing other designs shall meet the design requirements of this standard. The width of the platform shall be not less than 30 inches. ANSI A 3 4. Intermediate mountings shall be installed within 1 foot below each splice on the carrier. Equivalent protective methods may also be used. Cable guides utilized 7. Wood ladders may be painted. Maintenance and Use of Ladders 9.
Ladders shall not be coated with any opaque covering except for a minimum amount needed for identification or warning. Depending on the degree of glass fiber prominence. It is important to read the instructions supplied by the various material manufacturers of any substance used in a maintenance program.
Ladders are not designed or intended to possess an infinite safe useful life. Glass-fiber-reinforced plastic ladders that are used in areas of high humidity. Handling of the ladder after it has been washed should be kept to a minimum. It is further suggested that a semiannual coating program be carried out to ensure longevity of the ladder. This will greatly decrease the possibility of glass fiber prominence.
Shoes and footwear should be kept clean. The ladder rail should be brushed or sprayed with a good commercially available grade of acrylic lacquer. Inspections for rust. As a result of the abovementioned conditions. The ladder should be washed with a suitable commerical solvent or liquid detergent solution compatible with its composition and allowed to air dry.
The ladder supplier should be contacted for recommended practices to be followed in this field in-service maintenance program. If this condition is evident. The footwear employed by the user may also contribute to falls. While ladders are designed for extended service.
Safety procedures involving adequate ventilation. Platforms and Cages. MIN Y. ANSI Al4. ANSI A 1 4. Through these channels U. American National Standards Institute. The Standards Institute provides the machinery for creating voluntary standards. Inc Broadway New York.
American National Standards are on file in the libraries of the national standards bodies of more than 60 countries.
Some 1O00 companies are affiliated with the Institute as company members. American National Standards. Thus the completed standards cut across the whole fabric of production. It is a federation of trade associations. The completed standards are used widely by industry and commerce and often by municipal.
The Standards institute. American National Standards The standard in this booklet is one of standards approved to date by the American National Standards Institute.
Draft specifications issued by CECC.
In addition. And that's not all. Information Handling Services. Turn to the American National Standards Institute. Michigan Oak Park.
A standing order service is available to standards users who wish to receive new and revised standards automatically. Inverness Business Park. Colorado IO. Supplements are published several times a year.
Flag for inappropriate content. If wooden ladders are used, they should not be used in humid environments, or should be protected against deterioration from exposure to moisture. If the distance from the top of a parapet to the roof-top exceeds one rung-space i. Fixed ladders should not be located in areas where the atmosphere creates or contributes to unsafe conditions.
For example: where ice may build up or steam may condense on a ladder, or where oil-or grease-laden air is present, such as cooking areas in commercial kitchens. Rungs should have a non-slip surface. To accommodate functional or additional safety requirements, dimensions which exceed the minimum specified dimensions in Figures 1, 2, 3 and 4 may be used provided sizes are increased from the minimum specified sizes to maintain the same factor of safety.
In the design example attached Fig. Side rail shapes that do not permit a power grip should not be used. The same shape of side rails should be maintained for all ladders in the same length of climb.
The minimum size cross-section of side rails is dependent upon the material the side rails are construction from, and section properties adequate to support the design loads specified in section 4. For different design loads or support spacing, the minimum size of side rails must be adjusted in accordance with good engineering practice.
The same size cross-section of side rails should be maintained for all ladders in the same length of climb. For different materials the minimum recommended size must be adjusted in accordance with good engineering practice. Where it is not practicable to have fixed extensions of side rails above a landing, equivalent provisions must be arranged.
Extensions integrated into guardrails, telescoping side rails, extensions incorporated into roof hatches, etc. Post extensions are not considered acceptable.
Table of Contents
See Fig. An elevated access from a platform having less than 1. Cages should be provided with horizontal hoops or bands to help impede the fall of a worker. Cages should not be less than mm wide and should extend not less than mm and not more than mm from the centre-line of the rung measured on the climbed side of the ladder, horizontally and perpendicular to the rung. Do not use both sides of the ladder unless it was designed to be used in that manner.
Portable Ladders non-self-supporting : Make sure the rungs and steps are designed or coated to be slip-resistant.
If used as a means to access another surface, the ladder must extend three feet above the surface being accessed and be secured. If that is not possible, secure the ladder and provide a device to help employees safely access and exit the ladder. For every four feet of ladder height, make sure the base of the ladder is placed one foot from the surface it rests on four to one rule.
Do not move the ladder while it is extended. Make sure the ladder sections are locked before using.
Do not extend the ladder beyond its designed stopping point. Fixed: Make sure ladders over 24 feet have safety devices, self-retracting lifelines and rest platforms or a safety cage.
Make sure the ladder can support the added weight of any ice buildup.
Make sure the safety devices are tested and meet the pound, inch drop test requirement.American National Standards are subject to periodic review and users are cautioned to obtain the latest editions and errata sheets. The clear portions of steps or rungs on which a person may step while ascending or descending a ladder. Robert Reid.. Ladder Security Systeml5 9. That part of a ladder safety device consisting of the moving component with locking mechanism that travels on the carrier and makes the connection between the carrier and the safety belt.
A barrier erected along the exposed edges of a platform or landing surface to prevent falls of materials or tools that would create hazards to persons below.
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