Safety Information
6
Measurement categories
This instrument complies with CAT III (600 V) and CAT IV (300 V) safety require-
ments.
To ensure safe operation of measurement instruments, IEC 61010 establishes
s
afety standards for various electrical environments, categorized as CAT
II to
CAT IV, and called measurement categories. These are defined as follows.
CAT II: Primary electrical circuits in equipment connected to an AC electrical
outlet by a power cord (portable tools, household appliances, etc.)
CAT II covers directly measuring electrical outlet receptacles.
CAT III: Primary electrical circuits of heavy equipment (fixed installations) con-
nected directly to the distribution panel, and feeders from the distribu-
tion panel to outlets.
CAT IV: The circuit from the service drop to the service entrance, and to the
power meter and primary overcurrent protection device (distribution
panel).
Using a measurement i n s t r u m e n t in an environment designated with a
h
igher-numbered category than that for which the instrument is rated could re-
sult in a severe accident, and must be carefully avoided.
Use of a measurement instrument that is not CAT-rated in CAT II to CAT IV
m
easurement applications could result in a severe accident, and must be care-
fully avoided.
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