Safety Information
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Measurement categories (Overvoltage categories)
This instrument complies with CAT IV (600
V), CAT III (1000 V) safety requirements.
To ensure safe operation of measurement
instruments, IEC 61010 establishes safety
standards for various electrical
environments, categorized as CAT I to CAT
IV, and called measurement categories.
These are defined as follows.
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 than
a device designed for CAT II.
Using a measurement instrument in an
environment designated with a higher-num-
bered 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.
CAT I
Secondary electrical circuits connected to an AC electri-
cal outlet through a transformer or similar device.
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 in-
stallations) connected directly to the distribution panel,
and feeders from the distribution panel to outlets.
CAT IV
The circuit from the service drop to the service entrance,
and to the power meter and primary overcurrent protec-
tion device (distribution panel).
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