Safety Notes
6
This instrument complies with CAT II (1000 V) and CAT III (600 V) safety requirements.
To ensure safe operation of measurement instruments, IEC 61010 establishes safety standards for vari-
ous electrical environments, categorized as CAT II to CAT IV, and called measurement categories.
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.
Use of a measurement instrument that is not CAT-rated in CAT II to CAT IV measurement applications
could result in a severe accident, and must be carefully avoided.
Measurement categories
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 electri-
cal outlet receptacles.
CAT II covers directly measuring electrical outlet receptacles.
CAT III Primary electrical circuits of heavy equipment (fixed installations) 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 pri-
mary overcurrent protection device (distribution panel).
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