iii
────────────────────────────────────────────────────
Safety Notes
────────────────────────────────────────────────────
CATⅠ
Secondary electrical circuits connected to an AC electrical
outlet through a transformer or similar device.
CATⅡ
Primary electrical circuits in equipment connected to an AC
electrical outlet by a power cord (portable tools, household
appliances, etc.)
CATⅢ
Primary electrical circuits of heavy equipment (fixed
installations) connected directly to the distribution panel,
and feeders from the distribution panel to outlets.
CATⅣ
The circuit from the service drop to the service entrance,
and to the power meter and primary overcurrent protection
device (distribution panel).
Measurement categories (Overvoltage categories)
This instrument complies with CAT III safety requirements.
To ensure safe operation of measurement instruments, 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 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.
Never use a CAT I measuring instrument in CAT II, III, or IV environments.
The measurement categories comply with the Overvoltage Categories of the
IEC60664 Standards.
To Next Page
Loading...
