CAN/ULC-S508-M90

1. SCOPE 1.1 These requirements cover classification, rating, and extinguishing performance of fire extinguishers intended for use in attacking Class A, B and D fires, and fires in Class C situations, as defined herein. 1.2 These requirements also cover classification and performance during fire tests of media for application to Class D fires. 1.3 The ultimate classification and rating of an extinguisher or the prescribed use of an extinguisher or media (except Class C) is based on its fire-extinguishing potential as determined by fire tests. 1.4 Fire extinguishers or media or both are required to comply also with the applicable requirements for construction and performance in the pertinent separate Standard for each type, but all such additional requirements which apply are not considered to be within the scope of the requirements for fire tests.