Hioki 2301-20, Инструкция по эксплуатации

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Safety Notes
4
This instrument complies with CAT I safety requirements.
To ensure safe operation of measurement instruments, IEC
61010 establishes safety standards for various electrical en-
vironments, categorized as CAT I to CAT IV, and called mea-
surement categories. These are defined as follows.
CAT I Secondary electrical circuits connected to an AC
electrical outlet through a transformer or similar in-
strument.
CAT II Primary electrical circuits in equipment connected to
an AC electrical outlet by a power cord (portable
tools, household appliances, etc.)
CAT III Primary electrical circuits of heavy equipment (fixed
installations) connected directly to the distribution
panel, and feeders from the distribution panel to out-
lets.
CAT IV The circuit from the service drop to the service en-
trance, and to the power meter and primary overcur-
rent protection instrument (distribution panel).
Higher-numbered categories correspond to electrical environ-
ments with greater momentary energy. So a measurement in-
strument designed for CAT III environments can endure
greater momentary energy than a instrument designed for
CAT II.
Using a measurement instrument in an environment designat-
ed with a higher-numbered category than that for which the in-
strument 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.
Measurement categories (Overvoltage categories)