Kewtech KT500 User manual

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KT500
RCD Tester
Operating Instructions

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1. SAFETY
1.1 Equipment Markings
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.
CAT
III
500V
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.
>550V
The KT500 is designed to be used by skilled persons in accordance
with safe methods of work. If the KT500 is used in a manner not
specied 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 KT500 with the battery cover off as this will
compromise the insulated safety barrier.
To maintain safety, ensure serviceability and to monitor accuracy of
the KT500 the tester should be checked on a checkbox such as the
Kewtech FC2000 checkbox at regular intervals.
When connecting to mains, ensure the colour coding on the test
leads and terminals is adhered to.
Although fully protected against over voltage up to 440V, the tester
should only be used on 230V systems.
1.2 Operational Safety
Contents
KT500 RCD tester
KAMP 12 Mains lead
Batteries
Carry Case
Manual
Optional
ACC063 distribution board lead set

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The KT500 is a digital RCD tester that will test the most commonly
encountered RCD’s to current standards. This includes standard (AC)
type, selective (ACS) type and A type RCD’s.
2. DESCRIPTION
2.1 Features
• AC, ACS, A type RCD testing
• 30mA Auto test
• Ramp Test
• x½ , x1 test on all RCD types
• x5 test on 30mA RCD’s
• Auto 0º - 180º cycle
• AC Voltage VLN
• Distribution network operator polarity test pad
• Result Recall
• Hands free function
• Polarity, voltage present LED
• Auto switch off function for battery preservation.
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. A fail condition
will be indicated by a red backlight and a warning tone.
2.2 Indication
Battery status
0-180º
Mains voltage
indication
Ramp
LCD display shown in the ramp test function.

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3.1 Battery Installation
Unit requires 4 x AA batteries.
Ensure that all test leads are removed before installing batteries.
Remove the rubber over mould and battery cover on the reverse
of the unit. Install the new batteries ensuring correct polarity as
indicated. After installing batteries and before use ensure the battery
cover and over-mould are correctly tted, switch on the unit and
check for correct operation.
Dispose of used batteries as per the local authority’s guidelines.
3.2 Operation
30mA Auto Test
The 30mA auto test is available for A and AC type RCD. Select the
required 30mA Auto test on the rotary dial. The tester will monitor the
mains for correct polarity and voltage. If parameters are correct the
Volts Present LED will illuminate green and a test can the carried out.
On pressing the test button. The auto test will begin. X½ , x1 and x5
tests will automatically be carried out at 0º and 180º. The results can
be seen by using the recall button to toggle through results.
RCD Manual Testing
Select the required RCD type on the rotary dial. Then use the
multiplier button to select the required test current. If the mains
polarity and voltage are correct the ‘green volts’ present LED
will illuminate and a test can be carried out by pushing the test
button. The rst test will always be done at 0º the tester will then
automatically cycle to 180° ready for the next test.
4mm colour
coded sockets
3. USAGE
Volts
Present /
Polarity LED
Multiplier /
Ramp function
select
Results recall
Rotary
selection dial
Hands Free
selection
button
Polarity
touch pad

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4. MAINTENANCE AND SERVICE
If required, clean with a damp cloth and mild detergent. Do not use
abrasives or solvents.
With the exception of the batteries there are no user serviceable
parts.
Contact Kewtech for parts and technical assistance.
WARRANTY - 2 years manufacturer’s when registered on the website:
Kewtechcorp.com/product-registration
ExpressCal, Unit 2, Shaw Wood Business Park, Shaw Wood Way,
Doncaster DN2 5TB
T: 01302 761044
E: [email protected]
Ramp Test
Rather than applying a set test current this gradually increases the
level of additional leakage to identify at what current the RCD trips.
Select the required RCD type on the rotary dial. Then use the
multiplier button to select the ramp feature. If the mains polarity and
voltage are correct the green volts present LED will illuminate and
a test can be carried out by pushing the test button. The tester will
display the leakage current at which the RCD tripped along with a
pass or fail indication.
Hands Free
The Hands Free function can be used with any RCD test. Select the
required RCD type on the rotary dial. Press the Hands Free button
HANDSFREE will be displayed on the screen. Once the tester is
connected, correct voltage and polarity are conrmed a RCD test will
be conducted without TEST being pressed.
Polarity Test Pad
It is a little known fact that a system can be reverse wired at the
incoming distribution board with Live (Phase) to earth/neutral and
earth/neutral to Live (Phase). In this condition the sockets will all
work and conventional testers will show and test that everything is
correct despite this very dangerous wiring condition.
Although extremely rare, this dangerous condition can exist so if your
test shows this fault do not proceed.
Touch the touchpad area next to the test button. There should be
no change in the indication given. If the Voltage/Polarity LED ashes
Red and a warning tone is emitted when the touchpad is touched
a potentially dangerous polarity reversal exists. Do not proceed. If
in any doubt advise the customer to contact the electricity supply
company immediately.

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Power supply 4 x AA LR6 Batteries
Battery life 50 hours
Overvoltage category CAT IV 300V
Operating temperature 0 - 40ºC
Storage temperature -10 to 60ºC
Operating humidity 80% @ 31ºC to 50% @ 40ºC
Safety compliance BSEN 61010-2-030:2010
EMC compliance BSEN 61326-2-2:2013
Performance standard BSEN 61557-1:2007
BSEN 61557-6:2007
Probes GS38 compliant
Dimension (mm) 180mm x 85mm x 50mm
Weight (g) Approximately 450g
Supply Voltage 195V - 253V AC 50Hz
Voltage
0 - 260 V ± (3% + 3 digits)
SPECIFICATION
Test Current Accuracy
Test Current Accuracy
x ½ - 0% to - 10%
x 1 , x 5 + 0% to +10%
Trip Time Accuracy
Test Current Accuracy
< 1 second ± (1% + 1 ms)
> 1 second ± (1% + 10 ms)
RCD Trip Time
Measurement Range Operating Range Per BSEN61557-6
5 ms - 1999 ms 38 ms - 1999 ms

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For repair and calibration please return to us at :
Express Cal
Unit 2, Shaw Wood Business Park, Shaw Wood Way, Doncaster DN2 5TB
01302 761044 F: 01302 321993
[email protected]
Kewtech Corporation Limited
Midas House, Unit 2b, Stones Courtyard, High Street, Chesham, Bucks HP5 1DE
01494 792212 F: 01494 791826
[email protected]