iv
_____________________________________________________________________
Safety Notes
______________________________________________________________
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.
Measurement categories (Overvoltage categories)
This product complies with CAT I safety requirements.
To ensure safe operation of measurement products, IEC 61010
establishes safety standards for various electrical environments,
categorized as CAT I to CAT IV, and called measurement
categories. These are defined as follows.
Higher-numbered categories correspond to electrical environments
with greater momentary energy. So a measurement device
designed for CAT III environments can endure greater momentary
energy than a device 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. Never use a CAT I measuring product in CAT II, III, or
IV environments. The measurement categories comply with the
Overvoltage Categories of the IEC60664 Standards.
