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CAT II
Primary electrical circuits in equipment connected to
a wall outlet via 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
panel, and feeders between the distribution panel
and outlets.
CAT IV
The circuit from the service drop to the service
entrance, then to the power meter and to the primary
overcurrent protection device (distribution panel).
Measurement categories
This product complies with CAT II safety requirements.
To ensure safe operation of measurement product, IEC 61010 establishes
safety standards for various electrical environments, categorized as CAT II to
CAT IV, and called measurement categories.
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.
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