All devices required for the electro discharge machining (EDM) equipment in the electro discharge corrosion process, including machine tools, spark generators, control circuits, processing liquid containers, and assemblies. The phenomenon of energy being emitted from a source into space in the form of electromagnetic waves. b) Energy propagates in space in the form of electromagnetic waves. [GB/T4365-2003, Definition 161-01-10] Note: The meaning of the term "electromagnetic radiation" can sometimes be extended to include induction phenomena. Equipment for resistance welding and allied processes All equipment related to resistance welding and allied processes, including power supplies, electrodes, tool manufacturing, and related control equipment, may be an independent unit or part of a complex machine. Grid connected power converter; GCPC is connected to AC power distribution networks or other AC power devices and used as a power converter for power generation systems. High power electronic systems and equipment containing one or more semiconductor power converters or devices containing such power converters, with a total rated power greater than 75 kVA. Note: For example, used for power converters in UPS (Uninterruptible Power Supply System) and PDS (Electric Drive System). Industrial, scientific and medical (ISM) applications (of radio frequency energy) refer to equipment or appliance applications that generate and/or use radio frequency energy for industrial, scientific, medical, household or similar purposes, but do not include applications in the telecommunications field. [ITU Radio Rules Volume 1:2012, Definition 1.15] Note. Typical applications are products that generate physical, biological, or chemical effects such as heating, gas ionization, mechanical vibration, hair removal, and charged particle acceleration. Appendix A provides a list of equipment examples, but not limited to them. ISM RF equipment and appliances refer to equipment or appliances that generate and/or use RF energy for industrial, scientific, medical, household or similar purposes, but do not include equipment used in telecommunications, information technology, and other national standards. Note: The abbreviation "ISM RF" only applies to such devices or applications in this standard. Low voltage; LV is a set of voltage levels used for power distribution, with an upper limit generally considered as 1000 V AC or 500 V DC. [IEC 60050-601: 1985601-01-26, modified - added word 'or DC 1500 V.' Photovoltaic power generation system is an electric power generation system that utilizes the photovoltaic effect to convert solar energy into electrical energy