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Safety Notes
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CAT I
Secondary electrical circuits that are connected
to a wall outlet through a transformer or similar
device.
CAT II
Primary electrical circuits in equipment
connected to a wall outlet via a power cord
(portable tools, household appliances, etc.)
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.
Overvoltage Categories (CAT)
This product conforms to the safety requirements for CAT II measurement
products.
To ensure safe operation of measurement products, IEC 60664 establishes
safety standards for various electrical environments, categorized as CAT I to
CAT IV, and called overvoltage categories. These are defined as follows.
Higher-numbered categories correspond to electrical environments with
greater momentary energy, so a measurement product designed for CAT III
environments can endure greater momentary energy than one designed for
CAT II. 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.
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