International Electrical Symbols - Elma Instruments 22 User Manual

Measurement Category III (CAT III) is for measurements performed in the building installation.
Examples are measurements on distribution boards, circuit-breakers, wiring, including cables, bus-
bars, junction boxes, switches, socket-outlets in the fixed installation, and equipment for industrial
use and some other equipment, for example, stationary motors with permanent connection to the
fixed installation.
Measurement Category II (CAT II) is for measurements performed on circuits directly connected
to the low voltage installation. Examples are measurements on household appliances, portable tools
and similar equipment.
WARNING
To reduce the risk of fire or electric shock, do not expose this product to rain or moisture. To avoid
electrical shock hazard, observe the proper safety precautions when working with voltages above 60
VDC or 30 VAC rms. These voltage levels pose a potential shock hazard to the user. Do not touch
test lead tips or the circuit being tested while power is applied to the circuit being measured. Keep
your fingers behind the finger guards of the test leads during measurement. Inspect test leads and
probes for damaged insulation or exposed metal before using the instrument. If any defects are
found, replace them immediately.

INTERNATIONAL ELECTRICAL SYMBOLS

Caution ! Refer to the explanation in this Manual
!
Caution ! Risk of electric shock
Earth (Ground)
Double Insulation or Reinforced insulation
Fuse
AC--Alternating Current
DC--Direct Current
Elma 22 - 25 - 27 side 33