This part of IEC 60519 is applicable to equipment using microwave energy alone or in combination with other kinds of energy for industrial heating of materials. This part is applicable to industrial microwave heating equipment operating in the frequency range 300 MHz to 300 GHz. NOTE 1 Since the wavelength of the high end of the microwave band at 300 GHz is very short and particular leakage measurement instrumentation is needed in the low end of the band@ the microwave leakage specification in Annex A applies only for the ISM frequencies between 800 MHz and 6 GHz. The centre frequencies of these are 2@45 GHz and 5@8 GHz universally@ and between 896 MHz and 918 MHz in some regions. For such microwave equipment IEC 62311 applies. For other microwave frequencies@ the basic restriction as addressed in informative Annex B or the ICNIRP Guidelines (see Bibliography) may be used. This part does not apply to appliances for household and similar use (covered by IEC 60335-2-25)@ commercial use (covered by IEC 60335-2-90) or laboratory use (covered by IEC 61010-2-010). NOTE 2 Since microwave tunnel ovens and also some other types of microwave equipment may be either for commercial@ laboratory or industrial use@ the following criteria are suitable for determination of the classification as industrial equipment: ?C commercial equipment is typically designed and planned for series production of many identical units@ whereas industrial equipment is typically produced in small series or even as single units. The processed goods are consumed or ready for final use at the end of the heating process. ?C laboratory heating equipment is for preparing material in a laboratory environment@ and the processed material is immediately available for investigations or further processing. Regular production of large quantities of material is not foreseen. ?C with industrial equipment@ the processed goods are not immediately accessible to the end user@ and the goods may additionally not be in a final state from the perspective of the end user.