What should be done with metal ladders that have been exposed to excessive heat?

When metal ladders have been exposed to excessive heat, placing them out of service until they can be tested is the most prudent action. Exposure to high temperatures can compromise the structural integrity of metal ladders, potentially leading to failure during use. This could pose serious risks to firefighters who rely on these ladders for safety and access.

Testing the ladders after exposure to heat helps to ensure that they still meet safety standards and functional requirements. This step is crucial because even if no visible damage is evident, the material itself may have weakened, making the ladder unsafe.

In contrast, continuing to use the ladders or only inspecting them closely without testing does not adequately address the potential hidden damage. Similarly, using the ladders with caution does not mitigate the risks associated with compromises in their strength or reliability. Therefore, placing ladders out of service until they can undergo proper testing is essential for maintaining safety standards in firefighting operations.