KEWTECH KT400DL Loop Impedance and PSC Tester Instruction Manual

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.

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.

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

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.

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.

SAFETY

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 IV 300V	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.
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.

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.

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

DESCRIPTION

The KT400DL is a no trip and high current, high resolution digital earth loop impedance tester.

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.

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 ff after approximately 3 minutes of inactivity. To switch the tester back on after auto power off, press any button.

LCD display shown in the no trip loop function.

USAGE

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 fitted, switch on the unit and check for correct operation.
Dispose of used batteries as per the local authority’s guidelines.

Operation
Loop No Trip L-E
This is a three wire test to measure Zs where the circuit is protected by 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 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 Ω 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 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

The Hands Free function can be used with any loop measurement. Select the loop measurement required with the rotary dial. Press the HandsFree button HANDSFREE will be displayed on the screen. Once the tester is connected, correct voltage and polarity is confirmed a loop test 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 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.

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: expresscal@kewtechcorp.com

SPECIFICATION

Voltage
Range	Accuracy
0 to 260 V	± (3% + 3 digits)

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 0	± (5% + 5 digits)
100.0 to 499.9 0	± (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 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)
Range	Accuracy
0.000 to 9.999 0	+ (3% + 30 m0)
10.00 to 99.99 0	+ (3% + 3 digits)
100.0 to 500.0 0	+ (3% + 3 digits)

Supply Voltage	195 – 260V (50 – 60 Hz)
Overprotection	440V

The following are details of the operating ranges for individual functions compliant with the performance requirements of EN61557

	Measurement Range	Operating Range EN61557	Other
Loop No Trip	0.010 0 – 500 0	1.04 0 – 500 0	230 V 50 Hz
Loop Hi-I	0.01 0 – 500 0	1.04 0 – 500 0	230 V 50 Hz

Power supply	4 x AA LR6 Batteries
Battery life	50 hours
Overvoltage category	CAT III 500V 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 61557-3:2007
Probes	GS38 compliant
Dimension (mm)	180mm x 85mm x 50mm
Weight (g)	Approximately 450g

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

kewtechcorp.com

Documents / Resources

KEWTECH KT400DL Loop Impedance and PSC Tester [pdf] Instruction Manual
KT400DL, KT400DL Loop Impedance and PSC Tester, Loop Impedance and PSC Tester, Impedance and PSC Tester, PSC Tester, Tester

References

User Manual

KEWTECH KT400DL Loop Impedance and PSC Tester

Product Usage Instructions