What is the standard spacing between rungs?

The rungs are uniformly spaced at 300 mm center-to-center to ensure safe and predictable climbing.

What material is mandated for the main structure of the ladder?

Wrought aluminium alloys conforming to IS 733 are used to provide a combination of high strength, durability, and low weight.

Is the ladder tested for structural integrity before use?

Yes, it must pass a deflection test and a proof load test to ensure it can safely support the weight of multiple fully equipped firemen without permanent deformation.

IS 4571

: 1977

Specification of Aluminium Extension Ladders for Fire Brigade use

CurrentSpecializedSpecificationFire Safety · Fire Fighting

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This standard specifies the requirements for materials, dimensions, manufacture, and performance testing of aluminium extension ladders designed specifically for fire brigade rescue and fire fighting operations.

Specification of Aluminium Extension Ladders for Fire Brigade use

Quick Reference Values

Standard rung spacing300 mm

Minimum overlap between sections3 rungs

Deflection test load75 kg

Strength test proof load300 kg

Practical Notes

Aluminium ladders are highly conductive. Extreme caution must be exercised when operating near live electrical installations to prevent electrocution.

Spring-loaded pawls, locking mechanisms, and hoisting ropes must be inspected regularly for wear and tear to prevent accidental retraction.

Rubber safety feet must be checked for degradation to ensure the ladder does not slip on wet or smooth surfaces during an emergency.