This is the European Standard that establishes the tests and methods used to verify the behaviour of cables subjected to fire tests. In particular, it establishes the procedure which determines the content of halogen acid gasses in emissions generated during combustion. As far as fire is concerned, the damages caused by the direct action of fire are added to those caused by corrosive agents in combustion gases which reach the environments untouched by the fire. If the sheaths and cable insulations are made of PVC, in the event of a fire, these products release from 25% to 30% their weight in chlorine which, combined with the humidity in the air, forms hydrochloric acid which is deposited on all surfaces the smoke come into contact with and hence begins its corrosive action. Corrosion damage often exceeds the damage caused by the fire itself. Vice versa, PM FLEX polypropylene conduits do not produce harmful acids during a fire and significantly reduce the emission of toxic fumes, thus safeguarding the health of workers and the integrity of objects. For these reasons, the use of polypropylene pipes is recommended in all locations that host large numbers of people, such as offices, hotels, hospitals, schools, banks, entertainment locations, buildings of historic and artistic value, etc.