Courtesy of ITSDF:
8.24 Platforms for Elevating Personnel
8.24.1 Design requirements for the manufacture of the platform shall include the following:
(a) a platform floor having a slip resistant surface located not more than 8 in. (200 mm) above the normal load supporting surface of the fork;
(b) floor dimensions which shall not exceed two times the load center distance listed on the rough terrain forklift truck nameplate, measured parallel to the longitudinal center plane of the truck, nor have a width greater than the overall width of the truck [measured across the load bearing tires plus 10 in. (250 mm) on either side]. Minimum space for each person on the platform shall not be less than 18 in. (450 mm) in either direction.
(c) a 4 in. (100 mm) minimum height toe plate which may be omitted at the access opening;
(d) an overhead protection device, when requested by the user;
(e) protection for personnel in their normal working position on the platform from moving parts of the rough terrain forklift truck that represent a hazard;
(f) information prominently indicated on the platform:
(1) maximum work load including personnel and equipment;
(2) weight of empty platform.
(g) means so that the platform can only be centered laterally on the rough terrain forklift truck and retained against the vertical face of the forks, carriage, or lifting mechanism;
(h) a means to securely attach the platform to the lifting mechanism, and to prevent the platform from inadvertent pivoting;
(i) controls, when supplied for use on the elevating platform, shall be readily accessible to the operator and protected from damage and inadvertent actuation. They shall include provision to stop and start the engine of the rough terrain forklift truck and to lower the platform in case of engine failure;
(j) means shall be provided to render inoperative all operating controls, other than those on the elevating platform, when the controls on the elevating platform have been selected for use. Only one location of controls shall be capable of being operated at one time, with the exception of the emergency control(s) covered in para. 8.24.1 (k);
(k) when controls are provide on the platform, a clearly identified emergency lowering means available at ground level shall be provided. Such means shall be protected against misuse.
(l) restraining means such as a guardrail or a means for securing personnel such as a body belt or lanyard. A guardrail or similar structure shall have a nominal height to the platform floor of 42 in. (1066 mm) around its upper periphery and include a midrail. It may be hinged, removable, or of chains, and used if proper positioning is easily discernible. Such restraining means shall be capable of withstanding a concentrated horizontal force of 200 lb (890 N) applied at the point of least resistance without permanent deformation. A body belt and lanyard is to have an attachment point provided overhead for freedom of movement, and its length is to limit free-fall to 5 ft (1500 mm) measured from the point of attachment to the operator. The complete system shall be capable of withstanding three consecutive drop tests to simulate a 250 lb (113 kg) person falling 6 ft (1800 mm) without allowing the test weight to fall free to the ground. A deceleration device may be included.
(m) lanyards, when provided, shall be arranged so as not to cause a tripping hazard;
(n) body belts, when provided, should have a width of at least 1.75 in. (44 mm);
(o) structural safety factor – all load supporting structural elements of the work platform shall have a structural safety factor of not less than 2 to 1 based on the minimum yield strength of the materials used.