To limit the probability that portable extinguishers will not perform as intended for the type of fire hazard present, which could lead to ineffectiveness in carrying out fire suppression operations using the portable extinguishers, which could lead to the spread of fire beyond the point of origin, which could lead to harm to persons.
To supersede the requirements stated in Sentence 2.1.5.1.(2) relating to the performance of portable extinguishers.