To limit the probability that combustible piping penetrating rated assemblies will contribute to the growth and spread of fire within the assemblies, which could lead to the structural failure and collapse of the assemblies, which could lead to harm to persons.
To limit the probability that combustible piping penetrating rated fire separations will contribute to the growth and spread of fire within the fire separations, which could lead to a loss of integrity of the fire separations, which could lead to the spread of fire and smoke from one fire compartment to another, which could lead to harm to persons in the other compartment.