Kewtech KT63 PLUS User manual

Kewtechcorp.com
KT63 PLUS
Multifunction Installation Tester
Operating Instructions

kewtechcorp.com
2
Index
Safety information and explanation of symbols used ..................................4
Contents of the KT63 PLUS .......................................................................5
Inserting Batteries ....................................................................................7
Overview ..................................................................................................8
Rotary Switch Functions ............................................................................ 9
Push Button Functions.............................................................................10
Continuity Test Function ..........................................................................10
Insulation Test Function...........................................................................13
Special Polarity Test Pad......................................................................... 16
Loop Test Function..................................................................................17
RCD Test Function...................................................................................23
Phase Rotation .......................................................................................27
Specications and Tolerances .................................................................28

kewtechcorp.com
3
kewtechcorp.com
The KT63 PLUS Multifunction Tester has been designed and built to the highest standards providing
you with a safe and simple solution to your test requirements.
The KT63 PLUS tester is used to verify the safety of Commercial, Domestic and Industrial
installations. All testing is required to meet BS7671: The requirements for Electrical Installations
(IET wiring regulations 2018). The KT63 PLUS covers all aspects of these requirements with ease
of use and safety in mind.
Conformance with Standards
This tester complies with all the latest UK and European regulations.
This tester has been tested according to the following regulations:
• BS EN 61010-2-030:2010 - Safety requirements for electrical equipment for measurement,
control and laboratory use. Particular requirements for testing and measuring circuits.
• BS EN 61326-2-2:2013 - Electrical equipment for measurement, control and laboratory use.
Particular requirements for portable test, measuring and monitoring equipment used in low-
voltage distribution systems.
• BS EN 61557:2007 - Electrical safety in low voltage distribution systems up to 1000V AC.
and 1500V DC. Equipment for testing, measuring or monitoring of protective measures.
• Part 1 : General Requirements
• Part 2: Insulation Requirements
• Part 3: Loop Requirements
• Part 4: Continuity Requirements
• Part 6: RCD Requirements
• Part 7: Phase Rotation Requirements
• Part 10: Multifunction Requirements

kewtechcorp.com
4>550V
Caution - refer to the instruction manual.
Caution! Voltage present. Risk of Electric Shock.
Earth.
Construction is double insulated.
Product should be recycled as electronic waste.
User accessible fuse in battery compartment - F0.5A, 500V, HRC 6.3 x 32mm
Prohibited to use on Electrical Systems which use voltages above 550V.
Conforms to EU standards.
CAT III / CAT IV
CAT III Testers are designed to protect against transients and fault currents
in xed equipment installations at the distribution level. Examples are
measurements on distribution boards and socket wiring.
CAT IV Testers are designed to protect against transients and fault currents from
the primary supply level (overhead or underground utility service). Examples are
measurements made before the main fuse or circuit breaker.
Safety
Equipment Markings
WARNING
Read Before Using
• To maintain operator safety use only specied accessories.
• When working on live circuits, use of a proving unit such as the Kewtech KEWPROVE is
recommended to establish correct function of the tester.
• If the equipment is used in a manner not specied by the manufacturer, the protection
afforded by the equipment may be impaired.
• Disconnect from external circuits before removing battery cover.
• Inspect the tester and accessories for damage before use and do not use if damage
is found.

kewtechcorp.com
5
kewtechcorp.com
Safety
Before using the KT63 PLUS read this instruction manual carefully to ensure a safe
understanding of the symbols and use of the tester. See opposite page for a list of symbols
used on the product and in this manual.
A Warning identies hazardous conditions and actions that could cause bodily harm or death.
A Caution identies conditions and actions that could damage the instrument or cause
permanent loss of data.
Read Before Using
To prevent possible electrical shock, re, or personal injury:
• Use the product only as specied, or the protection supplied by the product can be
compromised.
• Do not use the product around explosive gas, vapour or in damp or wet environments.
• Do not use test leads if they are damaged. Examine the test leads for damaged insulation,
exposed metal, or if the wear indicator shows. Check test lead continuity.
• Use only Kewtech approved accessories such as test leads etc supplied with the instrument.
• Do not use the product if it is damaged.
• To be repaired by Kewtech or authorised Kewtech agents only.
• Do not apply more than the rated voltage between the terminals or between each terminal
and earth ground.
• Remove test leads from the tester before battery cover is removed.
• Do not operate the product with covers removed or the case open. Hazardous voltage
exposure is possible.
• Use only specied replacement fuse. Fuse type F0.5A, 500V, HRC 6.3 x 32mm
• Keep ngers behind the nger guards on the probes at all times.
• Connect the common test lead before the live test lead and remove the live test lead before
the common test lead.
• Use Personal Protective Equipment (approved rubber gloves, face protection, and ame-
resistant clothes) to prevent shock and arc blast injury where hazardous live conductors are
exposed.

kewtechcorp.com
6
Contents of the KT63 PLUS
Your Kewtech Multifunction Tester comes complete with:
• Kewtech KT63 PLUS Multifunction Tester
• Mains test lead with BS1363 Plug (KAMP12)
• 3 Wire distribution board test lead set with probes and crocodile clips (ACC063)
• Remote Switch Probe
• AA LR6 Alkaline batteries x 6
• Heavy Duty Carry Case
• Neck Strap
• Certicate of Calibration
All the parts listed above are included in the carry case

kewtechcorp.com
7
kewtechcorp.com
Inserting batteries
To insert batteries ensure the instrument is switched off and no test leads are connected.
Remove battery cover from base of unit, insert batteries into holder ensuring correct polarity.
Replace cover.
Always use good quality LR6 AA (x6) Alkaline Batteries and do not mix old and new batteries.
Re-chargeable batteries are not suitable.
Battery power level indicated on the colour display by the symbol.
Please dispose of your batteries carefully.
Batteries are made from important resources and chemicals, including lead, cadmium, zinc, lithium
and mercury. If batteries are disposed of as normal waste, they’ll be taken to a landll site and those
resources will be lost and will contribute to the pollution of the environment. Recycling is one way
you can help the environment and you should dispose of used batteries separately from other waste,
using local collection and recycling schemes available.

kewtechcorp.com
8
Overview
Front panel and controls
Top view

kewtechcorp.com
9
kewtechcorp.com
Rotary switch functions
All test functions are selected by using the main rotary switch.
1. Power off.
2. Continuity
3. 250V Insulation test
4. 500V Insulation test
5. 1000V Insulation test
6. 1000mA RCD test (Manual)
7. 500mA RCD test (Manual)
8. 300mA RCD test (Manual)
9. 100mA RCD test (Manual)
10. 30mA RCD test (Manual)
11. 10mA RCD test (Manual)
12. 30mA RCD test (Auto)
13. Phase rotation test
14. High resolution L-N loop test
15. High current earth loop impedance test
16. No trip earth loop impedance test

kewtechcorp.com
10
Push Buttons
1. Test Button - Initiates all selected tests.
2. Polarity Phase - Checks incoming mains polarity
3. Hands Free - Hands Free function for Continuity, Insulation & Loop
4. PFC PSC / Loop - Prospective fault current value after Loop Test Result
RCD Recall - List the last set of RCD data from an autotest sequence
5. RCD Multiplier - Cycles between ½x, 1x, 5x & ramp
6. Continuity Null - Nulls the resistance value of the test leads in use
RCD Type - Toggles between AC & A type RCDs
Auto Power Off Function
To ensure long battery life the KT63 PLUS will automatically power off when standing
idle for 5 minutes. To power the KT63 PLUS back on either return the selector switch to
“OFF” and then back to the test selection or simply press any of the four buttons under the
display screen.
Continuity
Caution
Principle of Measurement
1
2
3 4 56
Measurements must only be carried out on de-energized circuits.
If the tester is connected to a live circuit (25V or greater), the LED will ash red and the
hazard buzzer will sound. Your KT63 PLUS is fully protected and measured RMS voltage
will be displayed on the secondary/lower display. Further testing after this point will be
inhibited. To resume testing, disconnect the test leads and isolate the circuit.

kewtechcorp.com
11
kewtechcorp.com
During continuity measurement current ows from battery positive through the Brown (VΩ)
lead, external circuit resistance, Green (COM) lead, meter resistance and nally back to the
battery negative.
The current and voltage are measured as shown and the external resistance calculated.
When the leads have previously been nulled, their resistance is subtracted before displaying
the reading.
The purpose of Continuity Testing is to establish the resistance of the circuit under test.
Test Procedure
Insert the brown test lead into the brown input terminal & the green test lead into the green
terminal.
The brown test lead can be substituted by using the brown remote test probe supplied. This
allows remote activation of the KT63 PLUS from the safety of the test probe ensuring that you
are always looking at the point of contact and not the KT63 PLUS.

kewtechcorp.com
12
Lead Nulling
Test Leads are nulled to ensure accurate resistance values of circuit under test. To achieve this
you must null the resistance of the leads in use. Using the croc clips connect the open ends of
the test leads together rmly ensuring a good connection, then press the continuity null button,
the instrument will display the resistance value of the test leads, then press the test button, the
display will then show 0.00Ω and your test leads are successfully nulled. The word NULL will
appear on the display.
IMPORTANT – When connecting the croc clips they must be connected as in the picture
shown this ensures that the best point of contact is made to give the most accurate
resistance value of the leads that will be used for testing.
If inserting new or different length leads you must reset the memory and then repeat
process above.
N.B. Nulled results will be stored until a user reset. To reset simply leave the KT63 PLUS in
continuity mode and open circuit i.e. do not have leads connected. Then press NULL this will then
remove the null function. The word NULL will no longer be displayed.
The KT63 PLUS is now correctly set up to perform continuity testing on a circuit.
You can also set up your KT63 PLUS to be used in hands free mode on continuity by simply
pressing the HANDS FREE button and then pressing test. HANDS FREE will ash at the top of
the screen to indicate you are in hands free mode. To deactivate simply press the HANDS FREE
button again.
Before Null After Null
NULL
Ω
0.10
0
V
Vrms
NULL
Ω
0.00
0
V
Vrms

kewtechcorp.com
13
kewtechcorp.com
Insulation
Caution
Measurements must only be carried out on de-energized circuits.
If the tester is connected to a live circuit (25V or greater), the LED will ash red and the hazard
buzzer will sound. Your KT63 PLUS is fully protected and measured RMS voltage will be displayed
on the secondary/lower display. Further testing after this point will be inhibited. To resume testing,
disconnect the test leads and isolate the circuit.
All equipment and appliances should be disconnected from the circuit under test. Attached
equipment may be damaged by the higher voltages applied during testing and may return an
articially low test result.
There may be capacitance on the circuit being tested after you have a measured result. Your tester
will automatically discharge this, do not disconnect the test leads or change tester function until
auto-discharge has completed.
Warning
Do not touch the ends of the test leads while on the Insulation test functions as they are energised.
Results of measurements can be adversely affected by impedances of additional operating circuits
connected in parallel or by transient currents.
Principle of Measurement
During insulation measurement the tester generates a high voltage internally. The positive side
of this is connected to Brown (VΩ) lead causing a very small current to ow through the external
insulation resistance, Green (COM) lead, meter resistance and nally back to the negative side of
the HV generator.
The current and voltage are measured as shown
and the external resistance calculated and
displayed.

kewtechcorp.com
14
Test Procedure
Insert the brown test lead into the brown input terminal & the green test lead into the green
terminal. The brown test lead can be substituted by using the red remote test probe supplied.
This allows remote activation of the KT63 PLUS from the safety of the test probe ensuring
that you are always looking at the point of contact and not the KT63 PLUS.
Select insulation on the rotary switch either 250V, 500V or 1000V setting as required.
Connect the brown test lead to the phase conductor and the green test lead to the other
conductor under test and press the test button.
Press the test button, the tester will beep indicating voltage output through the test leads and
the circuit under test. The display will indicate output voltage then display the result of test in
MΩ. 0V output will indicate if nished and no voltage present.
When test is activated the red Voltage/Polarity will ash warning there is voltage on the leads
and circuit under Test.
Test in progress with
voltage output
Test result
M Ω
TESTING
531
V
Vrms
M Ω
500.0
0
V
Vrms
>

kewtechcorp.com
15
kewtechcorp.com
Hands Free
Hands Free Insulation Testing.
To enable the hands free feature simply press the ‘HANDS FREE’ button once. The ‘HANDS
FREE’ annunciator will appear ashing on the display, press the test button to start testing. The
‘HANDS FREE’ annunciator will continue to ash until cancelled by a further press of the ‘HANDS
FREE’ button or by changing the function selector switch.
When the ‘HANDS FREE’ annunciator is ashing a single press of the ‘HANDS FREE’ button will
toggle continuous testing on and off.
Once started a steady beeping tone will be emitted to indicate that measurement is being taken.
After a second or two the test result will be displayed in the primary display area and an audible
tone will indicate either by a single beep that the result is a value above 2MΩ or by a short
2 tone alarm that the result is a value under 2MΩ. The secondary display area will show the
terminal voltage being applied.
The tester will continue to take the measurement and any further change to the resistance of
the circuit will be indicated by an audible tone as described above and a change of result on the
display.
Whilst testing in hands free mode the red warning LED will ash to warn of the voltage between
the prod tips/crocodile clips.
A further single press of the test button will suspend measurement.

kewtechcorp.com
16
Polarity Test Pad
In No-trip mode the tester can be used with the mains lead KAMP12
when testing at 13A socket outlets, or the distribution board lead
set ACC063 for testing at other points in the circuit. In No-trip mode
the 3 colour coded prods/crocodile clips of the test lead should be
connected to the corresponding Line, Neutral and Earth terminals.
Your Kewtech KT63 PLUS tester has a special polarity test function.
It is a little known fact that a system can be reverse
wired with Live (Phase) to earth/neutral and earth/
neutral to Live (Phase) 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 - if
in any doubt advise your customer to contact their
supply company immediately.
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.

kewtechcorp.com
17
kewtechcorp.com
Loop Impedance Testing
Principle of Measurement – Hi-I
Hi-I Line-Earth loop measurement takes place in several steps:
a) The tester measures an unloaded half-cycle of the mains.
b) The tester switches in load RL.This causes the mains circuit to be slightly attenuated due
to the effective source impedance.
c) The tester measures a second half-cycle with the mains still loaded.
d) The load is removed.
The resistive part of ZI is calculated from the unloaded and loaded half-cycle measurements. Each
pair of measurements is taken adjacently to minimize noise and several such pairs may be used
for best accuracy. The inductive part of ZI is calculated from the unloaded and loaded half-cycle
durations. Any inductance causes a measurable lag in the loaded half-cycle.
Note: When testing on a supply with inductance exceeding 1mH or phase angle exceeding 30°
accuracy may be reduced.
RL

kewtechcorp.com
18
Loop Impedance Testing
Principle of Measurement – No-Trip
The No-Trip Line-Earth loop range measures the same circuit value ZI using a two-stage technique.
In the rst stage the Live-Neutral loop
impedance ZLN is measured using the same
principle as for the Live-Earth loop.
The second stage is similar to Hi-I but operates
at a low current to avoid tripping RCDs.
CAUTION
Although fully protected against over voltage to 550VAC this tester should only be used
on a 230V supply.
Important note for calibration check box users: The smart loop test system used by the
KT63 PLUS is immune to sudden high value changes such as voltage spikes. As a result
when changing calibration or check box loop values the tester or the supply must be
switched off between changes of calibration values.
The KT63 PLUS Loop test function has 2 modes for Loop testing that allow the user to conduct
the most accurate test possible depending whether or not the circuit under test is protected by
an RCD.
Intermittent Operation
The KT63 PLUS is designed for a large number of loop tests in rapid succession. In the unlikely
condition this limit is exceeded a thermometer will be shown on the display until the unit cools
down. Testing will be inhibited while the thermometer is shown.
Mains Supply Wiring And Voltage Test
When rst connected to a mains supply the KT63 PLUS will automatically conduct a safety test to
ensure that the Live, Neutral and Earth conductors are all connected correctly and that the supply
voltage is in the acceptable range (207-253V)
If all is well the VOLTAGE/POLARITY warning LED will light Green and the supply voltage will be
displayed in the primary display area.
In the event of a problem with either the mains voltage supply or reversed connections the
VOLTAGE/POLARITY warning LED will light Red, a warning tone will be sounded and testing will be
inhibited.
This condition will be indicated for your safety.

kewtechcorp.com
19
kewtechcorp.com
Loop Test Procedures
Hands Free Loop Testing
The hands free feature can be used in either No Trip or high current test modes.
To enable the hands free feature simply press the ‘HANDS FREE’ button once, The ‘HANDS FREE’
annunciator will appear ashing on the display and will continue to do so until cancelled by a
further press of the ‘HANDS FREE’ button or by changing the function selector switch.
When the ‘HANDS FREE’ annunciator is ashing all you need to do is connect the test lead to a
mains supply and the test will be carried out.
High Current Mode
For Ze testing at the distribution board or at any point upstream of RCD protection there is
a traditional fast high current test mode. The high current mode is a 2-wire test that enables
the user to test the true impedance of both the Line-Neutral Loop and the Line-Earth loop and
therefore to establish both the PSC (prospective short circuit current) and the PFC (prospective
fault current) for the installation.
Unlike most testers that only measure the resistance of the Loop, the high current mode of the
KT63 PLUS will measure the impedance of the Loop which includes an element of reactance.
This can be signicant where the distribution board is close to the mains supply transformer and
is therefore much more accurate than older Loop testing techniques.
You should be aware that because of this there may well be variations in reading compared to
ordinary loop testers or to the non-trip function of this tester, particularly when the measurement
is made near to the mains supply transformer.
No Trip Mode
For Zs testing where the circuit being tested is protected by an RCD there is the No Trip Loop
Test mode. In this mode testing can be made at sockets on the nal circuit without fear of
tripping the RCD under normal circumstances.
This is achieved by testing at a current that is too low to trip an RCD on an otherwise healthy
circuit. The No Trip test is a 3-wire test that also checks the Live, Neutral/Earth conductors are
correctly connected before running the loop test.
Note- if there is abnormal standing leakage current on the circuit such as a faulty Microwave
Cooker for example then this abnormal leakage is added to low current used for the above test
and the RCD may trip.
However this can be seen as an advantage since it is pointing to a faulty appliance that should
be rectied or replaced.

kewtechcorp.com
20
Whilst No-Trip testing at points on the nal circuit will normally function with a high level of
accuracy, it should be noted that the low current measurement technique used is more likely to
be adversely affected by external factors such as noise on the mains supply.
Circumstances such as testing at seldom used socket outlets with tarnished contacts or testing
a circuit with a lot of background noise from electronic apparatus can result in the occasional
erroneous reading.
For this reason it is recommended that multiple measurements are made when using the No-trip
mode and any isolated odd results are ignored. When taking multiple readings the tester should
be disconnected from the supply between consecutive tests.
For safety reasons the No-Trip mode is recommended for all measurements made on TT
systems.
Where practical all other equipment powered by the same circuit should be switched off before
testing. This will reduce the chances of the RCD tripping as a result of combined leakages.
PFC / PSC
In both Loop test modes the KT63 PLUS will also display the supply voltage and at the touch
of the PFC PSC / Loop button the PFC / PSC depending on being connected L-E or L-N, will be
displayed.
Test Lead Conguration
The KT63 PLUS Loop test function can be used with 2 types of connecting lead. It is important to
understand and use the correct lead conguration for each test mode or you may not obtain the
correct results.
Lead Options
Kewtech KAMP12 mains lead with 3 x 4mm connectors to 13A plug
Kewtech ACCO63 3 wire distribution board test lead set that can be tted with either prod tips or
crocodile clips as required.
2 Wire lead conguration Brown (live) Blue (neutral) Green (earth) are connected into the
instrument. The neutral is inserted into the back of the earth lead at the prod (or croc clip) end to
give a combined contact for 2 wire test method.
The brown test lead can be substituted by using the brown remote test probe supplied. This
allows remote activation of the KT63 PLUS from the safety of the test probe ensuring that you
are always looking at the point of contact and not the KT63 PLUS.