KT300
Insulation / Continuity Tester
Operating Instructions
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1. Safety
1.1 Equipment Markings
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550V
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CAT
IV
300V
CAT
III
500V
Caution - refer to the instruction manual.
Construction is double insulated.
Product should be recycled as electronic waste.
Conforms to EU standards.
Prohibited to use on Electrical Systems which use voltages
above 550V.
Measurement Category IV is applicable to testing and
measuring circuits at the origin of the installations supply.
They are utility level CAT checks. This part of the installation
is expected to have a minimum of one level of over-current
protective device between the transformer and connecting
points of the measuring circuit.
This tester’s voltage rating for CAT IV locations is 300V,
where the voltage is Phase (line) to Earth.
Measurement Category III is applicable to testing and
measuring circuits connected after the source of the
building’s low-voltage MAINS installation. This part of the
installation is expected to have a minimum of two levels of
over-current protective devices between the transformer and
connecting points of the measuring circuit.
Examples of CAT III are measurements on devices installed
after the main fuse or circuit breaker xed within the building
installation. Such as distribution boards, switches and
socket outlets.
This tester’s voltage rating for CAT III location is 500V where
the voltage is Phase (line) to Earth.
1.2 Operational Safety
The KT300 is designed to be used by skilled persons in accordance
with safe methods of work. If the KT300 is used in a manner not
specied by Kewtech, the protection provided by it may be impaired.
Inspect the product before using. If any damage is visible; such as
cracks in the casing, damage to any accessories, leads or probes,
the unit should not be used.
Do not operate the KT300 with the battery cover off as this will
compromise the insulated safety barrier.
To maintain safety, ensure serviceability and to monitor accuracy of
the KT300 the tester should be checked on a checkbox such as the
Kewtech FC2000 checkbox at regular intervals.
Although fully protected against accidental connection to live circuits
the KT300 should only be used on dead circuits. If accidentally
connected to a live circuit the Volts Present LED will ash and an
audible alarm will sound. Testing will be inhibited.
During insulation testing do not touch the jaws of any clips or the
prod tips as they will become energised.
Contents
KT300 Continuity Insulation Tester
ACC020 2 wire test lead set
Batteries
Carry case
Manual
Optional
Kewcheck R2 - socket test lead adapter
Lightmates – test lead adapters for lighting points
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2. DESCRIPTION
The KT300 is compact high specication digital insulation /
continuity tester.
2.1 Features
• Insulation test (50V, 100V, 250V, 500V, 1000V)
• Continuity test
• Buzzer
• Continuity Null
• Hands free function
• Breakdown Voltage
• Voltage Present LED
• Auto switch off function for battery preservation.
2.2 Indication
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The white display backlight will illuminate on switching on and during
testing. To preserve battery life the backlight will switch off after
approximately 4 seconds of inactivity. The unit will automatically
power off after approximately 3 minutes of inactivity. To switch the
tester back on after auto power off, press any button.
Battery status
3. USAGE
Volts Present
LED
Continuity Null
Breakdown
Voltage
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Rotary
selection dial
Hands Free
selection button
Blown fuse
Test voltage
applied
4mm colour
coded sockets
The LCD is shown indicating a blown fuse
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