Interior fire suppression operations in large buildings should not begin until:

Establishing a continuous water supply is crucial before initiating interior fire suppression operations in large buildings. A reliable water supply ensures that firefighters have the necessary resources to combat the fire effectively and safely. Without this critical resource, efforts can be hampered, potentially leading to a situation where firefighters are forced to withdraw or unable to suppress the fire adequately.

In larger buildings, the fire can grow quickly, and having a continuous supply of water allows firefighters to maintain an aggressive attack on the fire, which is essential for controlling it and protecting lives and property within the structure.

While there are other important considerations, such as the presence of a high-ranking fire official or initiating search and rescue operations, these factors do not directly impact the immediate need for an adequate water supply, which is foundational to effective fire suppression efforts. Salvage operations, while important for limiting damage, also occur typically after initial fire control measures have been established.