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EnglishDefinition ofInstallationCategories(see IEC 664-1)SymbolsCleaningCAT I: Circuits in which measuresare taken to limit transientovervoltages to an appropriately lowvoltage. E.g. protected electroniccircuits.CAT II: Power supply circuits fordomestic appliances and the likewhich may be subject to mediumleveltransient overvoltages.E.g. household appliances andportable tools.CAT III: Power supply circuits forpower appliances which may besubject to high-level transientovervoltages.E.g. industrial machines or devices.CAT IV: Circuits which may besubject to very high-level transientovervoltages.E.g. power feedersDirective 2002/96/EC (WEEE)Unplug the leads from external circuitsand turn the instrument off. Clean theinstrument with a damp cloth and soap.Never use abrasive products orsolvents.Make sure the instrument is quite drybefore reusing it.