Introduction and scope The best method for testing electrotechnical products with regard to fire hazard is to duplicate exactly the conditions occurring in practice. In most instances this is not possible. Accordingly@ for practical reasons@ the testing of electrotechnical products with regard to fire hazard is best conducted by simulating as closely as possible the actual effects occurring in practice. Parts of electrotechnical equipment which might be exposed to excessive thermal stress due to electric effects and the deterioration of which might impair the safety of the equipment shall not be unduly affected by heat and by fire generated within the equipment. The test described in this standard is applicable to electrotechnical equipment and to its sub-assemblies and components.