All fixed ladders greater than 20 feet (6.1 m) require a safety cage, well, or other safety device.
When fixed ladders are used to ascend to heights exceeding 20 feet (6.1 m), landing platforms shall be provided for each 30 feet (9.14 m) of height or fraction thereof. Where no cage, well, or ladder safety device is provided, landing platforms shall be provided for each 20 feet (6.1 m) of height or fraction thereof.