This part of IEC 60695provides guidance for the assessment of surface spread of flame for electrotechnical products and the materials from which they are formed. It provides: • an explanation of the principles of flame spread for both liquids and solids, • guidance for the selection of test methods, • guidance on the use and interpretation of test results, and • informative references This basic safety publication is intended for use by technical committees in the preparation of standards in accordance with the principles laid down in IEC Guide 104 and ISO/IEC Guide 51. One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications. The requirements, test methods or test conditions of this basic safety publication will not apply unless specifically referred to or included in the relevant publications.