Shall be read in conjunction with IEC 519-1 and 519-6. Applicable to industrial microwave heating installations used for the purpose of thermal applications of loads containing water or moisture such as heating, drying of partially conductive or non-conductive materials, such as wood, textiles, paper, foodstuffs, etc., in both normal and protective atmospheres, using, for example, inert gas or vacuum. Relates to microwave power generators in the frequency range 300 MHz to 6 GHz comprising an assembly of electrical and mechanical devices intended for the transfer of microwave power to the material to be treated.