The transfer of liquid into containers mounted on vehicles shall NOT take place under which of the following conditions?

Transferring liquid propane into containers mounted on vehicles within a building is considered unsafe due to the risk of flammable vapors accumulating in an enclosed space. Propane is a highly flammable substance, and any leaks or spills during the transfer process can create a hazardous situation where vapors can ignite, posing a severe fire and explosion risk. Therefore, regulations and safety protocols typically prohibit the transfer of propane in such environments to ensure that any potential leaks can dissipate safely into the atmosphere rather than accumulating indoors.

While transferring propane under other conditions, such as during high winds or at night, may also present certain risks, these situations can be managed with proper precautions and safety measures in practice. Weather shelters are designed to protect from environmental elements rather than posing the same level of risk associated with confined spaces.