Cage Ladder

JOMY permanent ladders with safety cage for access and egress.

JOMY Cage ladders or Caged ladders are permanent ladders with a safety cage. This JOMY safety cage can be composed of complete hoops, 3/4 hoops or 1/2 hoops.

 

According to standard ISO 14122-4 (machinery access), a safety cage is required for ladders above 3m (except when a lifeline is used). The safety cage has to provide a free diameter at a minimum of 65cm and a maximum of 80cm.

 

Each JOMY safety cage is composed of five round cage uprights at 18mm, which pass centrally through the hoops with square section of 25mm. The free diameter within the hoops is 70cm. The vertical distance between the hoops can be fixed freely according to required specifications. It is recommended to limit this vertical distance to a maximum of 1m.

Technical specifications

A JOMY permanent cage ladders in one piece cannot be longer than 10m according to standard ISO 14122-4 (machinery access). Longer JOMY ladders must be composed of multiple fights, each at a maximum of 6m. The user can switch from one flight to the next via rest-landings. On these landings JOMY provides double cages.

 

JOMY makes the cages also according American OSHA rules including the flared openings. These are ready available in our warehouse in the U.S.A..

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A Guide to OSHA rules on Fixed Ladders

Fixed Ladders

If the total length of the climb on a fixed ladder equals or exceeds 24 feet (7.3 m), the ladder must be equipped with ladder safety devices; or self-retracting lifelines and rest platforms at intervals not to exceed 150 feet (45.7 m); or a cage or well and multiple ladder sections with each ladder section not to exceed 50 feet (15.2 m) in length. These ladder sections must be offset from adjacent sections and landing platforms must be provided at maximum intervals of 50 feet (15.2 m). In addition, fixed ladders must meet the following requirements:

  • Fixed ladders must be able to support at least two loads of 250 pounds (114 kg) each,

concentrated between any two consecutive attachments. Fixed ladders also must support

added anticipated loads caused by ice buildup, winds, rigging and impact loads resulting from

using ladder safety devices.

  • Individual rung/step ladders must extend at least 42 inches (1.1 m) above an access level or

landing platform either by the continuation of the rung spacing as horizontal grab bars or by

providing vertical grab bars that must have the same lateral spacing as the vertical legs of the

ladder rails.

  • Each step or rung of a fixed ladder must be able to support a load of at least 250 pounds (114 kg) applied in the middle of the step or rung.
  • Minimum clear distance between the sides of individual rung/step ladders and between the side rails of other fixed ladders must be 16 inches (41 cm).
  • Rungs of individual rung/step ladders must be shaped to prevent slipping off the end of the rungs.
  • Rungs and steps of fixed metal ladders manufactured after March 15, 1991, must be corrugated, knurled, dimpled, coated with skid-resistant material or treated to minimize slipping.
  • Minimum perpendicular clearance between fixed ladder rungs, cleats, and steps and any obstruction behind the ladder must be 7 inches (18 cm), except that the clearance for an elevator pit ladder must be 4.5 inches (11 cm).
  • Minimum perpendicular clearance between the centerline of fixed ladder rungs, cleats and steps, and any obstruction on the climbing side of the ladder must be 30 inches (76 cm). If obstructions are unavoidable, clearance may be reduced to 24 inches (61 cm), provided a deflection device is installed to guide workers around the obstruction.
  • Step-across distance between the center of the steps or rungs of fixed ladders and the nearest edge of a landing area must be no less than 7 inches (18 cm) and no more than 12 inches (30 cm). A landing platform must be provided if the step-across distance exceeds 12 inches (30 cm).
  • Fixed ladders without cages or wells must have at least a 15-inch (38 cm) clearance width to the nearest permanent object on each side of the centerline of the ladder.
  • Fixed ladders must be provided with cages, wells, ladder safety devices or self-retracting lifelines where the length of climb is less than 24 feet (7.3 m) but the top of the ladder is at a distance greater than 24 feet (7.3 m) above lower levels.
  • Side rails of through or side-step fixed ladders must extend 42 inches (1.1 m) above the top level or landing platform served by the ladder. Parapet ladders must have an access level at the roof if the parapet is cut to permit passage through it. If the parapet is continuous, the access level is the top of the parapet.
  • Steps or rungs for through-fixed-ladder extensions must be omitted from the extension; and the extension of side rails must be flared to provide between 24 inches (61 cm) and 30 inches (76 cm) clearance between side rails.
  • When safety devices are provided, the maximum clearance distance between side rail extensions must not exceed 36 inches (91 cm).
  • Fixed ladders must be used at a pitch no greater than 90 degrees from the horizontal, measured from the back side of the ladder.

 

Cages for Fixed Ladders

The requirements for cages for fixed ladders are as follows:

  • Horizontal bands must be fastened to the side rails of rail ladders or directly to the structure, building or equipment for individual-rung ladders.

Vertical bars must be on the inside of the horizontal bands and must be fastened to them.

  • Cages must not extend less than 27 inches (68 cm), or more than 30 inches (76 cm) from the centerline of the step or rung and must not be less than 27 inches (68 cm) wide.
  • Insides of cages must be clear of projections.
  • Horizontal bands must be spaced at intervals not more than 4 feet (1.2 m) apart measured from centerline to centerline.
  • Vertical bars must be spaced at intervals not more than 9.5 inches (24 cm), measured centerline to centerline.
  • Bottoms of cages must be between 7 feet (2.1 m) and 8 feet (2.4 m) above the point of access to the bottom of the ladder. The bottom of the cage must be flared not less than 4 inches (10 cm) between the bottom horizontal band and the next higher band.
  • Tops of cages must be a minimum of 42 inches (1.1 m) above the top of the platform or the point of access at the top of the ladder. There must be a way to access the platform or other point of access.

 

Wells for Fixed Ladders

The requirements for wells for fixed ladders are as follows:

  • Wells must completely encircle the ladder.
  • Wells must be free of projections.
  • Inside faces of wells on the climbing side of the ladder must extend between 27 inches (68 cm) and 30 inches (76 cm) from the centerline of the step or rung.
  • Inside widths of wells must be at least 30 inches (76 cm).

 

Ladder Safety Devices and Related Support Systems for Fixed Ladders

The connection between the carrier or lifeline and the point of attachment to the body belt or harness must not exceed 9 inches (23 cm) in length. In addition, ladder safety devices and related support systems on fixed ladders must conform to the following:

  • All safety devices must be able to withstand, without failure, a drop test consisting of a 500-pound weight (226 kg) dropping 18 inches (41 cm).
  • All safety devices must permit the worker to ascend or descend without continually having to hold, push or pull any part of the device, leaving both hands free for climbing.
  • All safety devices must be activated within 2 feet (.61 m) after a fall occurs and limit the descending velocity of an employee to 7 feet/second (2.1 m/sec) or less.
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