KEWTECH KT400DL Loop Impedance and PSC Tester Instruction Manual
- September 17, 2024
- KEWTECH
Table of Contents
KT400DL Loop Impedance and PSC Tester
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Specifications
- Model: KT400DL
- Type: Loop Impedance & PSC/PFC Tester
- Power Source: 4 x AA batteries
- Operating Voltage: 230V
- CAT IV Voltage Rating: 300V
Product Usage Instructions
1. Safety
1.1 Equipment Markings:
- 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.
1.2 Operational Safety:
The KT400DL is designed for use by skilled persons following
safe methods of work. Inspect the product before using, and do not
operate if any damage is visible. Do not operate with the battery
cover off.
2. Description
The KT400DL is a no trip and high current, high resolution
digital earth loop impedance tester. It features a white display
backlight, automatic power-off, and mains voltage indication.
3. Usage
The tester features various buttons and functions:
- Volts Present / Polarity LED
- Voltage LN/LE/NE toggle button
- Hands-Free selection button
- PFC – PSC / Voltage toggle button
- Rotary selection dial
- Polarity touch pad
- 4mm color-coded sockets
3.1 Battery Installation
Unit requires 4 x AA batteries. Follow these steps:
-
Remove all test leads before installing batteries.
-
Remove the rubber over-mould and battery cover on the reverse
of the unit. -
Install new batteries with correct polarity.
-
Check for correct operation after installation.
3.2 Operation
This tester can be used for Loop No Trip L-E testing to measure
Zs in circuits protected by an RCD. Disconnect non-essential
electrical equipment to reduce RCD tripping chances.
FAQ
Q: What should I do if the tester shows visible damage?
A: Do not use the unit if any visible damage is present. Contact
customer support for further assistance.
Q: How often should I check the tester’s serviceability?
A: The tester should be checked at regular intervals using a
checkbox like the Kewtech FC2000 checkbox to ensure safety and
accuracy.
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KT400DL
Loop Impedance & PSC / PFC 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.
550V
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.
CAT
They are utility level CAT checks. This part of the installation
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IV
is expected to have a minimum of one level of over-current protective device between the transformer and connecting
300V
points of the measuring circuit.
This tester’s voltage rating for CAT IV locations is 300V, where
the voltage is Phase (line) to Earth.
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 fixed 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.
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1.2 Operational Safety
The KT400DL is designed to be used by skilled persons in accordance with safe
methods of work. If the KT400DL is used in a manner not specified 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
KT400DL with the battery cover off as this will compromise the insulated
safety barrier.
To maintain safety, ensure serviceability and to monitor accuracy of the
KT400DL, the tester should be checked on a checkbox such as the Kewtech FC2000
checkbox at regular intervals.
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Although fully protected against over voltage up to 440V, the tester should
only be used on 230V systems.
Contents KT400DL Loop Impedance and PSC/PSF Tester KAMP 12 Mains lead
Batteries Carry Case Manual Optional ACC063 distribution board lead set
Kewcheck R2 – socket test lead adapter Lightmates test lead adapters for
lighting points
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2. DESCRIPTION
The KT400DL is a no trip and high current, high resolution digital earth loop
impedance tester.
2.1 Features · No Trip LOOP L-E test · High current L-E loop test · High
current, High resolution L-E loop test · High current, High resolution L-N
loop test · AC Voltage VLN – VLE – VNE · Distribution network operator
polarity test pad · PFC / PSC measurements · Hands free function · Polarity,
voltage present LED · Auto switch off function for battery preservation.
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2.2 Indication 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
Mains
Mains voltage indication
LCD display shown in the no trip loop function. kewtechcorp.com
3. USAGE
Volts Present / Polarity LED
Voltage LN/LE/NE toggle button
Hands Free selection button
PFC – PSC / Voltage toggle button
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Rotary selection dial
Polarity touch pad
4mm colour coded sockets
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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 overmould are correctly
fitted, switch on the unit and check for correct operation.
Dispose of used batteries as per the local authority’s guidelines.
3.2 Operation
Loop No Trip L-E
This is a three wire test to measure Zs where the circuit is protected by
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an RCD. Where possible non-essential electrical equipment should be
disconnected to reduce the chance of the RCD tripping as a result of
leakage build up.
Turn the rotary dial to the Loop No Trip L-E position. Allow the tester to conduct a self test and check the incoming voltage and polarity. Voltage L-N will be displayed and Volts Present LED will illuminate green. Push TEST. Loop result will be displayed with voltage L-N.
Hi current loop modes
Unlike most testers that only measure the resistance of the Loop, the high current mode of the KT400DL will measure the true Impedance of the Loop which includes an element of reactance. This can be significant where the distribution board is close to the mains supply transformer and the KT400DL’s method is therefore much more accurate than older Loop testing techniques.
You should be aware that because of this there may well be variations in readings compared to ordinary loop testers or to the no-trip function
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of this tester, particularly when the measurement is made near to the mains
supply transformer.
Loop Hi Current L-E in 3-wire Testing This Hi current test is used to measure
Ze at the distribution board before any RCD or Zs where the circuit is not
protected by an RCD. Turn the rotary dial to the Loop Hi L-E Position. Voltage
L-N will be displayed and green volts present LED will illuminate green if
conditions are correct. Push TEST. Loop result is the true loop impedance and
will be displayed with Voltage L-N.
Loop Hi Resolution L-E (and L-N) in 3 wire Testing
This Hi current high resolution test is used to measure Ze at the
distribution board which is close to a transformer and gives a 0.001
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resolution. It also has to be conducted before any RCD in the circuit
or can be used to measure Zs where the circuit is not protected by an
RCD. Turn the rotary dial to the Loop Hi high resolution L-E (or L-N)
Position. Voltage L-N will be displayed and green volts present LED will
illuminate green if conditions are correct. Push TEST.
Loop result is the true loop impedance and will be displayed with Voltage L-N.
Lead Configuration for Hi Current 2-wire Testing.
Both the Loop Hi current L-E and Loop Hi resolution L-E (and L-N) tests can be
conducted in two wire mode by using the ACC063 test leads (not included with
the instrument, available as an option).
To arrange the test leads in 2-wire mode pull the blue prod or crocodile clip
off the blue test lead and plug the Blue probe into the back of the Green 4mm
connector as shown overleaf.
You will now have the Earth and Neutral leads connected together ready
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for connection to the Earth or Neutral conductor to be tested.
NB: In two wire mode the loop measurement, voltage displayed and PSC/PFC
results will pertain to the L-E or L-N circuit to which the test leads have
been connected.
Hands Free
Prods in 2 wire testing configuration
The Hands Free function can be used with any loop measurement. Select the loop
measurement required with the rotary dial. Press the Hands Free button
HANDSFREE will be displayed on the screen. Once the tester is connected,
correct voltage and polarity is confirmed a loop test
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will be conducted without TEST being pressed.
Volts L-N/ L-E / N-E Voltage L-N is the tester’s default setting. By pressing
VOLTS LN-LENE the voltage displayed will be toggled. The voltage displayed can
be toggled before or after a loop test is carried out.
PFC / PSC After a loop test has been carried out the calculated PCF or PSC can
be displayed by selecting PFC L-E / PSC L-N. See note under lead configuration
for Hi current two wire testing when used in two wire mode.
Polarity Test Pad It is a little known fact that a system can be reverse wired
at the distribution board with Live (Phase) to earth/neutral and earth/neutral
to Live (Phase). In this condition the sockets will all work and conventional
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loop 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 flashes 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.
4. MAINTENANCE AND SERVICE
If required, clean with a damp cloth and mild detergent. Do not use
abrasives or solvents.
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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: expresscal@kewtechcorp.com
5. SPECIFICATION
Range 0 to 260 V
Voltage Accuracy ± (3% + 3 digits)
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No Trip L-E Loop Test
(No trip L-E mode, 3 wire testing, Phase – Neutral – Earth all connected)
Range
Accuracy
0.00 to 99.99
± (5% + 5 digits)
100.0 to 499.9
± (3% + 3 digits)
Hi I L-E Loop Test (HI I L-E mode, 3 wire testing, Phase – Neutral – Earth all connected)
Auto Range
Accuracy
0.00 to 500.0
± (3% + 3 digits)
Hi-Resolution, Hi I L-E / L-N Loop Test
(HI I L-E/L-N mode, 3 wire testing, Phase – Neutral – Earth all connected)
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Range
Accuracy
0.000 to 9.999
+ (3% + 30 m)
10.00 to 99.99
+ (3% + 3 digits)
100.0 to 500.0
+ (3% + 3 digits)
Supply Voltage Overprotection
195 – 260V (50 – 60 Hz) 440V
The following are details of the operating ranges for individual functions compliant with the performance requirements of EN61557
Measurement Range
Loop No Trip 0.010 – 500 Loop Hi-I 0.01 – 500
Operating Range EN61557
Other
1.04 – 500 230 V 50 Hz
1.04 – 500 230 V 50 Hz
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Power supply
4 x AA LR6 Batteries
Battery life Overvoltage category Operating temperature
50 hours
CAT III 500V CAT IV 300V
0 – 40ºC
Storage temperature
-10 to 60ºC
Operating humidity
80% @ 31ºC to 50% @ 40ºC
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Safety compliance
BSEN 61010-2-030:2010
EMC compliance Performance standard Probes
BSEN 61326-2-2:2013 BSEN 61557-1:2007 BSEN 61557-3:2007 GS38 compliant
Dimension (mm)
180mm x 85mm x 50mm
Weight (g)
Approximately 450g
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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
0345 646 1404 (Select option 2) expresscal@kewtechcorp.com
Kewtech Corporation Ltd Suite 3 Halfpenny Court, Halfpenny Lane, Sunningdale,
Berkshire SL5 0EF
0345 646 1404 sales@kewtechcorp.com
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