11
Safety Information
Measurement Categories
To ensure safe operation of measuring instruments, IEC 61010
establishes safety standards for various electrical environments,
categorized as CAT II to CAT IV, and called measurement categories.
DANGER
Using a measuring instrument in an environment
designated with a higher category than the rating
of the instrument could result in a severe accident,
and must be carefully avoided.
Using a measuring instrument without categories
in an environment categorized as CAT II to CAT
IV could result in a severe accident, and must be
carefully avoided.
CAT II: When directly measuring the electrical outlet receptacles of the
primary electrical circuits in equipment connected to an AC electrical
outlet by a power cord (portable tools, household appliances, etc.).
CAT III: When measuring the primary electrical circuits of heavy equipment
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feeders from the distribution panel to outlets.
CAT IV: When measuring the circuit from the service drop to the service
entrance, and to the power meter and primary overcurrent protection
device (distribution panel).
T
Outlet
CAT II
Internal wiring
Distribution panel
Service entrance
Service drop
CAT IV
Power meter
CAT III
Fixed installation
The instrument’s labeling does not indicate its suitability for use in any
particular measurement category.
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Appendix
Index
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