5
Measurement categories
This product complies with CATIII (1000 V), CATIV (600 V)
safety requirements.
To ensure safe operation of measurement products, IEC 61010
establishes safety standards for various electrical environments,
categorized as CAT II to CAT IV, and called measurement cate-
gories.
Using a measurement product in an environment designated
with a higher-numbered category than that for which the product
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.
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) connected directly to the distribution pan-
el, and feeders from the distribution panel to outlets.
CAT IV
The circuit from the service drop to the service en-
trance, and to the power meter and primary overcur-
rent protection device (distribution panel).
