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Safety Information
Measurement categories
To ensure safe operation of measurement instruments, IEC 61010
establishes safety standards for various electrical environments,
categorized as CAT II to CAT IV, and called measurement
categories.
• Using a measuring 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.
• Using a measuring instrument without categories in
an environment designated with the CAT II to CAT
IV category could result in a severe accident, and
must be carefully avoided.
This instrument conforms to the safety requirements for CAT IV 600 V
measuring instruments.
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
(fixed installations) connected directly to the distribution panel, and
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)
Distribution panel
Service entrance
Service drop
6
DANGER
CAT IV
Power meter
Fixed installation
Internal wiring
CAT II
T
CAT III
Outlet
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