 This particular presentation relates to the construction products regulation and the general level of misunderstanding and confusion surrounding the testing method employed to classify cables. We will endeavour to explain the important topic of acid gas testing and the test method used. The test procedure and equipment is defined in BSEN 60754-2 2014 which replaced the previous EN 50267-2-3. This slide describes the test methods and equipment used to look at two important elements, which are acidity or corrosiveness of the gas by way of a pH measurement and the conductivity which is the ability of the dissolved solution to conduct electricity. Conductivity is also directly linked to the total dissolved solids in the solution and is expressed as microseconds per millimetre. The classification A1 is less than 2.5 microseconds per millimetre and a pH value of no less than 4.3. A2 is less than 10 microseconds per millimetre and a pH value of no less than 4.3. A3 is for products which no performance is declared or does not comply with either A1 or A2. We trust this has clarified this topic for you.