"These requirements cover double insulation systems intended for use in ungrounded electronic equipment marked ""Double Insulation@"" ""Double Insulated@"" or with the double-insulation symbol intended to be employed in accordance with the National Electrical Code@ ANSI/NFPA 70. These requirements also cover: a) Equipment required by the end-product standard to be provided with a double insulation system and to be grounded and b) Double-insulated equipment permitted by the end-product standard to be provided with a non-functional means for grounding. Equipment marked ""Double Insulation@"" ""Double Insulated@"" or with the double-insulation symbol shall comply with the applicable requirements in this standard and in the standard covering the particular type of equipment ?C the end-product standard. In cases where the end-product standard contains requirements for double insulation@ the end-product standard takes precedence. It is intended that the requirements in this standard be applied to end products marked as described unless the end-product standard specifies different requirements. These requirements were developed for categories that do not have double insulation requirements@ to provide guidance about double insulation systems@ and to promote consistent approaches to double insulation. Double insulation requirements for electronic equipment are applicable to the double insulation systems used in products contained in various end-product@ component and systems standards. Guidelines and Applications for Double Insulation Systems for Electronic Equipment in Appendix A covers: a) Level of Protection Provided by Double Insulation@ b) Methods to Address Product-Specific Double Insulation Requirements@ and c) Guidelines for Including Double Insulation Requirements in an End-Product Standard. A product that contains features@ characteristics@ components@ materials@ or systems new or different from those covered by the requirements in this standard@ and that involves a risk of fire@ electric shock@ or injury to persons shall be evaluated using the appropriate additional component and end-product requirements to determine that the level of safety as originally anticipated by the intent of this standard is maintained. A product whose features@ characteristics@ components@ materials@ or systems conflict with specific requirements or provisions of this standard shall not be judged to comply with this standard. Where appropriate@ revision of requirements shall be proposed and adopted in conformance with the methods employed for development@ revision@ and implementation of this standard."