When extending a 45-foot ladder, how many dogs should be locked?

When extending a 45-foot ladder, it is recommended to lock four dogs. The dogs are the locking mechanisms that secure the sections of the ladder as it is extended. Properly locking these dogs ensures the stability and safety of the ladder while in use, especially at extended heights.

Having four dogs locked solidifies the structure and prevents any accidental collapse or sliding of the ladder sections when weight is applied or when the ladder is being used for reaching elevated areas. This is particularly critical in firefighting scenarios where the reliability and safety of equipment can make a significant difference in emergency situations.

For shorter ladders, fewer dogs might suffice, but for a 45-foot ladder, using four provides optimal support and security. Thus, confirming that a proper and safe extension is achieved, which is vital for the safety of firefighters ascending or working from the ladder.