This part of this EN specifies the minimum requirements for safety and performance of optional permanently installed equipment on firefighting and rescue service vehicles as designated in EN 1846-1 and specified in prEN 1846-2. NOTE 1 Categories and mass classes of the firefighting and rescue vehicles are given in EN 1846-1. The permanently installed equipment dealt with in this part of this EN are given below: - water installation; - additive installation; - monitor; - equipment gantries.