To supersede the requirements of Sentence 4.10.8.1.(1), which would otherwise require portable extinguishers, and permit hose stations, if certain measures are taken [with respect to the location and spacing of the hose stations].
This is to limit the probability that fire suppression operations using hose stations will be delayed or ineffective in controlling or suppressing a fire, which could lead to the spread of the fire, which could lead to harm to persons.
To expand the application of Article 2.1.5.1.