Major tech MT26 Manual de instruções - Página 6
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1.3. INTERNATIONAL SAFETY SYMBOLS
Potential danger. Indicates the user must refer to the manual
for important safety information.
Indicates hazardous voltages may be present.
Equipment is protected by double or reinforced insulation.
MAX
Indicates the terminal(s)so marked must not be connected
to a circuit where the voltage with respect to earth ground
exceeds the maximum safety rating of the meter.
2. SAFETY CATEGORY RATINGS
Brief
Category
Rating
Description
Cat II
Single phase
receptacles and
connected loads
Cat III
Three phase circuits
and single phase
lighting circuits in
commercial buildings
The measurement category (CAT) rating and voltage rating is determined
by a combination of the meter, test probes and any accessories connected
to the meter and test probes. The combination rating is the LOWEST of
any individual component.
6
Typical
Applications
Household appliances, power tools
Outlets more than 10m (30ft) from a
Cat III source Outlets more than 20m
(60ft) from a Cat IV source
Equipment in fixed installations such
as 3-phase motors, switchgear and
distribution panels
Lighting circuits in commercial buildings
Feeder lines in industrial plants
Any device or branch circuit that is
close to a Cat III source