Major tech MT25, Инструкция по эксплуатации, Страница: 5 / 16

2. Safety Symbols
This symbol adjacent to another symbol, terminal or operating device
indicates that the operator must refer to an explanation in the Operating
Instructions to avoid personal injury or damage to the meter.
!
This symbol adjacent to one or more terminals identifies them as being
associated with ranges that may, in normal use, be subjected to
particularly hazardous voltages. For maximum safety, the meter and its
test leads should not be handled when these terminals are energized.
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.
2.1. Safety Category Ratings
Category
Rating Brief
Description
Typical Applications
CAT II Single phase
receptacles
and connected
loads
• Household appliances, power tools
• Outlets more than 10m (30ft) from a CAT III
source
• Outlets more than 20m (60ft) from a CAT IV
source
CAT III
Three phase
circuits and
single phase
lighting circuits
in commercial
buildings
• 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
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.
2.2. Warning
Operation is limited to CAT II applications when the insulated tips are removed
from one or both test probes. Refer to Input Limits section in this manual for
maximum voltage ratings.
CAT IV 600V
CAT III 1000V
TEST LEADS
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