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Safety
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Higher-numbered categories correspond to electrical
environments with greater momentary energy. So a
measurement device designed for CAT III
environments can endure greater momentary energy
thanadevicedesignedforCATII.
Using a measurement instrument in an environment
designated with a higher-numbered category than
that for which the instrument is rated could result in
a severe accident, and must be carefully avoided.
Never use a CAT I measuring instrument in CAT II,
III, or IV environments.
The measurement categories comply with the
Overvoltage Categories of the IEC60664 Standards.
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