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2. Features
KEW 4105A is an earth resistance tester for testing power distribution
lines, in-house wiring system, electrical appliances etc. It also has an earth
voltage range for earth voltage measurement.
○ Designed to safety standard IEC 61557.
○ Dust and drip proof construction in conformity with IEC 60529 (IP54).
Measurement can be made even under adverse weather conditions.
○ Large, easy-to-read LCD digital display.
○ Simplified measurement probe has a structure that both the alligator clip
and the test bar are available.
○ Warns when earth resistance of auxiliary earth spikes exceeds the
permissible limit.
○ Convenient carrying soft bag for accessories etc.
Measurement Category
To ensure safe operation of measuring instruments, IEC 61010 establishes
safety standards for various electrical environments, categorized as O to
CAT IV, and called measurement categories. Higher-numbered categories
correspond to electrical environments with greater momentary energy, so
a measuring instrument designed for CAT III environments can endure
greater momentary energy than one designed for CAT II.
O : Circuits which are not directly connected to the mains power
supply.
CAT II : Electrical circuits of equipment connected to an AC electrical
outlet by a power cord.
CAT III : Primary electrical circuits of the equipment connected directly
to the distribution panel, and feeders from the distribution panel
to outlets.
CAT IV : The circuit from the service drop to the service entrance, and to
the power meter and primary over-current protection device
(distribution panel).
O :Device which is
not directly
connected to the
mains power supply
Interior wiring
Incoming wire
Socket
CAT.Ⅳ
CAT.Ⅱ
CAT.Ⅲ
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