KT63 PLUS
Multifunction Installation Tester
Operating Instructions
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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
2
Insulation Test Function ........................................................................... 13
Special Polarity Test Pad ......................................................................... 16
Loop Test Function .................................................................................. 17
RCD Test Function ................................................................................... 23
Phase Rotation .......................................................................................27
Specications and Tolerances .................................................................28
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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 lowvoltage 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
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Safety
Equipment Markings
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
4
>
550V
CAT III / CAT IV
Prohibited to use on Electrical Systems which use voltages above 550V.
Conforms to EU standards.
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.
WARNING
Read Before Using
• To maintain operator safety use only specied 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 specied 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.
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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 identies hazardous conditions and actions that could cause bodily harm or death.
A Caution identies 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 specied, 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 specied 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 ameresistant clothes) to prevent shock and arc blast injury where hazardous live conductors are
exposed.
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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
• Certicate of Calibration
6
All the parts listed above are included in the carry case
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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 landll 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.
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Overview
Front panel and controls
8
Top view
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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
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Push Buttons
1
2
3 4
1. Test Button - Initiates all selected tests.
2. Polarity Phase - Checks incoming mains polarity
3. Hands Free - Hands Free function for Continuity, Insulation & Loop
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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
5
6
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
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.
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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.
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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.
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NULL
0.10
Before Null
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.
Ω
Vrms
0
V
After Null
0.00
NULL
Ω
Vrms
0
V
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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
articially 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.
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
Warning
the HV generator.
The current and voltage are measured as shown
and the external resistance calculated and
displayed.
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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.
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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.
TESTING
M
Ω
Vrms
531
V
Test in progress with
voltage output
When test is activated the red Voltage/Polarity will ash warning there is voltage on the leads
and circuit under Test.
>
500.0
Test result
M
Ω
Vrms
0
V
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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.
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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/
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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.
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Loop Impedance Testing
Principle of Measurement – Hi-I
RL
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.
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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.
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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.
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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.
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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 signicant 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 rectied or replaced.
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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.
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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 Conguration
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 conguration 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 conguration 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.
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High Current Test (Ze)
The high current should only be conducted with the distribution board test lead set
Kewtech ACCO63 congured in 2 wire mode. Do not use this function with the Kewtech
KAMP12 or the distribution board test lead set in 3-wire conguration.
Rotate the function selector to the Hi-I position.
Connect the test lead probes to the circuit under test and press the test button.
The result will be shown in the primary display and the mains voltage will be shown in the
secondary display.
Press the PFC PSC / Loop button
LOOP
0.71
Note: The reading described here as PFC / PSC will be the prospective fault current for
the circuit being immediately tested. This is known as PSC in the case of a test between
Live and Neutral or PEFC for a test between Live and Earth conductors.
BS7671 (IET wiring regulations 2018) calls for an IPF value to be recorded, this is the
higher of the PSC and PEFC as described above.
245
Ω
Vln
V
345.2
0.71
to show the PFC / PSC in the
PFC
primary display depending on
A
being connected L-E or L-N and
Loop
the impedance in the secondary
Ω
display area.
No Trip Loop Test (Zs)
Connect the brown, blue and green test leads to the corresponding output terminals on
the tester.
The brown test lead can be substituted by using the 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.
If testing the loop impedance at a socket, plug in the 13 amp plug and switch on the
power.
N.B. The circuit under test must be live to do loop testing.
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The test will be inhibited if the wiring has incorrect polarity on the circuit under test.
Rotate the function selector switch to ‘NO TRIP’
Connect the test lead to the socket/circuit under test.
Providing that the connections are correct and the supply voltage is within the correct range
the VOLTAGE/POLARITY LED will light Green, the Kewtech KT63 PLUS will start taking some
background measurements and will display the Line Neutral supply voltage
Voltage will be displayed. Then press the test button.
TESTING
242
VLN
The screen will show a symbol and the word TESTING.
V
22
LOOP
The result of the test will be shown in the primary display.
0.71
245
345.2
0.71
The leads are an integral part of the tester set-up and should accompany the tester when being
returned for re-calibration or service. Do not use any other type of mains lead or test lead set.
Ω
Vln
V
A single press of the PFC PSC / Loop button will toggle the display
PFC
so that the PFC is shown in the primary display and the impedance
A
in the secondary display. A further press will toggle the results
Loop
between the primary and secondary displays.
Ω
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RCD
Warning
Leakage currents in the circuit following the residual current protection device may
inuence the measurements.
Potential elds of other earthing installations may inuence the measurement.
Special conditions in S-type residual current protective devices shall be taken into
consideration.
Equipment connected downstream of a residual current protective device (RCD) may
cause considerable extension of the operating time. Examples of such equipment
might be connected capacitors or running motors.
Principle of Measurement – x1/2, x1, x5
During an RCD test an earth leakage current I is applied to unbalance the RCD.
During application of the current, VLN
is monitored using voltmeter V1 for an
RCD trip signature. When trip occurs,
the time from application of the earth
leakage current to the trip is calculated
and displayed.
Additionally, VLE is measured using
voltmeter V2 to monitor Fault Voltage.
If excessive Fault Voltage is detected,
testing is aborted and a warning is
displayed. This detection uses the
actual Fault Voltage occurring during the test and not the predicted fault voltage at the rated
residual current.
Application of the current is limited in duration. If no trip is detected during the application, an
over range reading is displayed. Note: when testing at x1/2, no trip is a PASS.
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Principle of Measurement – Ramp
During RCD Ramp testing, the earth leakage current starts at 20% of RCD rated current and
increases by 10% of RCD rated current every 300ms up to a maximum of 110%. For example
a 30mA Ramp test runs from 6mA to 33mA.
The trip time is measured as in the normal case and the trip level calculated from it.
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RCD Test Function
CAUTION
Although fully protected against over voltage to 550VAC this tester should only be
used on a 230V supply.
The KT63 PLUS will test all the most commonly encountered RCD’s of both standard (AC & A)
types and selective (ACS & AS) types across the full range of tests required by BS7671 (IET
wiring regulations 2018).
Test Requirements
Each RCD is tested to ensure that:
• It is not prone to ‘nuisance’ tripping it. It checks that it does not trip when a fault of half its
rated current is introduced. This is referred to as the x½ test.
• It operates with a maximum disconnection time of 300ms (AC&A type) when a fault at its
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rated current is introduced. This is referred to as the x1 test.
• In the case of an RCD rated at 30mA there is an additional requirement that it operates
with a maximum disconnection time of 40ms when a fault of ve times its rated current is
introduced. This is referred to as the x5 test.
For the reasons explained below all of the above tests have to be conducted at both 0° and
180° this means that four tests (or for 30mA RCD’s six tests) have to be made for each RCD.
The user friendly design of the KT63 PLUS simplies the test process by enabling you to do
any of these tests by making just two function selections.
Sinusoidal Polarity (the 0° or 180° test)
RCD’s often operate with different reaction times depending upon whether the fault is
introduced during the positive or negative half cycle of the AC waveform. Therefore to
accurately determine the maximum response time of an RCD it is necessary to test it twice
at each given fault current, rstly with the fault introduced during the positive half cycle and
secondly during the negative half cycle.
The KT63 PLUS takes care of this for you by alternating the start point of consecutive tests
at any given setting. If for example you have selected a test at the rated trip current (x1) of a
100mA RCD, the rst press of the test button will apply a 100mA fault current starting on the
positive half cycle (0°) and display the result. A further press of the test button will carry out
another test at the same current but starting on the negative half cycle (180°).
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Test Leads
Where testing is to be conducted at a point on the circuit other than a socket outlet the distribution
board test lead set Kewtech ACC063 is used in 3-wire mode as described in the previous chapter.
The probes can be tted with either prod tips or crocodile clips as required.
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/Earth conductors are correctly connected and that the supply voltage
is in the acceptable range of 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.
RCD Test Procedure
Select the type of RCD by pressing the RCD type button and the rating of the RCD to be tested with
the rotary function selector switch.
Connect the 4mm connectors of the chosen test lead to the corresponding L, N & E terminals of
the KT63 PLUS and connect the other end to the socket or circuit terminals under test.
If using the distribution board test lead set Kewtech ACC063 observe the correct polarity by
connecting the Brown probe to the Live conductor, Blue to Neutral and Green to Earth.
User Selected Test
x1
242
x1
40.0
The recommended order of tests is rstly at ½x the rated current
followed by a test at the rated current (x1) and nally, for 30mA RCD’s
VLN
only, 5x the rated current.
V
The default test parameters of x½ x1 x5 for the current multiplier and
0° for the phase polarity will be automatically selected for the rst test.
These will be displayed on the LCD along with the Live-Neutral voltage.
Press the test button and a test will be conducted at these settings. If
successful and the RCD has failed to trip a single beep will sound and
the main display will be similar to this example
MS
25
PASS
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Automatic Test
VLN:245V
30mA x 1/2 >2000ms PASS
30mA x 1/2 >2000ms PASS
30mA x 1 40.0ms PASS
30mA x 1 50.0ms PASS
30mA x 5 10.0ms PASS
30mA x 5 20.8ms PASS
Pass or Fail Result
In addition to displaying the time taken for the RCD to trip the KT63 PLUS will also indicate whether
it has passed or failed the test requirement of BS7671 (IET wiring regulations 2018).
x 1/2
>
26
2000
PASS
x 1/2
300.0
For the most commonly encountered 30mA RCD the test process is
even simpler. Just turn the rotary selector to the ‘30mA AUTO’ setting
and the KT63 PLUS will conduct all six required tests at a single touch
of a button. Then when the RCD under test “trips” reset the RCD and
continue to do so until the test procedure is complete then return to
your KT63 PLUS where all results will be displayed on one screen.
The main display shows that the fault current was supplied for
over 2000 milliseconds (2 seconds) without tripping the RCD. The
ms
secondary display conrms that this passes the requirements of
BS7671 (IET wiring regulations 2018).
In the event of the RCD failing the test and tripping within 2 seconds at
half the rated current the main display will show the trip time and the
ms
secondary display will show ‘FAIL’. A short 2 tone alert will also sound.
FAIL
After displaying the result for a few seconds the tester will switch to the 180° phase polarity
setting in readiness for the next test.
When both tests have been conducted at the x½ setting press the multiplier button to change the
test current to the x1 setting.
Press the test button to conduct a test at the x1 setting a 0°. The result will be shown as a pass if
RCD trips within 300ms. After displaying the result for a few seconds the tester will switch to the
180° phase polarity setting in readiness for the second test at the x1 current setting.
If the 30mA setting has been selected the x5 current option will be available by using the multiplier
button. This option is not available or required for other ratings.
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Ramp Test
The KT63 PLUS also includes a diagnostic Ramp test feature. In this mode rather than applying
a steady fault current and measuring the time taken for the RCD to trip, the KT63 PLUS gradually
increases the fault current and identies the level of additional leakage at which the RCD trips.
This is particularly useful in diagnostic testing of circuits where nuisance tripping is a problem and
helps to identify the difference between an over sensitive RCD and excessive leakage from poor
insulation or equipment with high leakage.
Use the rotary switch to select the rating of the RCD.
Press the RCD multiplier button until the symbol is displayed.
mA
24
PASS
retest the RCD with other appliances systematically connected and removed.
For example a 30mA RCD may trip at 12mA on ramp test with an appliance connected and then at
27mA with the appliance removed. You will know that the appliance is leaking approximately 15mA.
Press the test button to start the test. The fault current applied will
increment in 3mA steps until the RCD trips.
If nuisance tripping on a circuit is a problem this function can be used to
Phase rotation
Principle of Measurement
During phase rotation measurement the amplitudes and phase angles of the three inputs L1, L2, L3
are checked against limits, allowing for mild unbalance conditions. The indication 1-2-3 is displayed
for normal rotation (L2 lags L1) and 3-2-1 for reverse rotation (L2 leads L1).
Display of Phase rotation is Automatic when all three tests leads are connected to the 3 phase
supply:
Set the main rotary switch to PHASE.
Using three test leads, connect test leads to the L1 to Phase 1, L2 to Phase 2 and L3 to Phase 3.
The KT63 PLUS will display .1 .2 .3 or .1 .3 .2 depending on the direction of phase rotation.
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Warning
Only use LR6 Alkaline replacement batteries.
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 landll 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.
General Specications
Dimensions Accuracy
28
Dimensions H 115mm W 245mm D 140mm
Weight (With Batteries) 965g
Battery Type 6 x AA / LR6 Alkaline
Battery Life (Typical)
Protective Device F0.5A, 500V, HRC 6.3 x 32mm
LCD Display
Category Rating
Ingress Protection Rating IP54
Operating Temperature 0°C to 40°C
Storage Temperature -10°C to 60°C
Operating Humidity 80% @ 31°C to 50% @ 40 °C
Operating Altitude 0 to 2000m
Idling : 13.5 hours
Insulation according to BS EN61557-2: 1008 tests
Continuity according to BS EN61557-4: 960 tests
TFT (Thin-Film-Transistor) Colour LCD 3.5” Diagonal
320xRGBx240 pixels
300V CAT IV
600V CAT III
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Measurement Specications and Accuracies
High Current - High Resolution
2 wire test Live – Earth or Phase - Phase.
Measurement Range Accuracy
0.000 Ω to 9.999 Ω ± (3% + 30mΩ) 100 - 440 V ac 50-60 Hz 550 V
System Voltage
Range
System Voltage
Frequency
Over Voltage
Protection
(BS EN 61557-10)
Loop / PFC-PSC
High Current
2 wire test Live – Earth or Phase - Phase, 7A nominal at 230V.
Measurement Range Accuracy
0.00 Ω to 500.0 Ω ± (3% + 3 digits) 100 - 440 V ac 50-60 Hz 550 V
System Voltage
Range
System Voltage
Frequency
Over Voltage
Protection
(BS EN 61557-10)
No Trip
3 wire test Live-Earth, 13 mA nominal at 230V, max 5Ω Neutral impedance.
Measurement Range Accuracy
0.00 Ω to 500.0 Ω ± (5% + 5 digits) 195 - 253 V ac 50-60 Hz 550 V
System Voltage
Range
System Voltage
Frequency
Over Voltage
(BS EN 61557-10)
Insulation
Test Voltage Measurement Range Accuracy
250 V 0.001 to 200.0 MΩ ± (3% + 2 digits + 10%/GΩ) < 2 mA 550 V
500 V 0.001 to 500.0 MΩ ± (3% + 2 digits + 5%/GΩ) < 2 mA 550 V
1000 V 0.001 to 1000 MΩ ± (3% + 2 digits + 2.5%/GΩ) < 2 mA 550 V
Short Circuit
Current
(into 2kΩ)
Over Voltage
Protection
(BS EN 61557-10)
29
Protection
Output Voltage
Voltage Load Accuracy Output Current
250 V 250 kΩ -0% +20% 1 mA <2 mA
500 V 500 kΩ -0% +20% 1 mA < 2 mA
1000 V 1 MΩ -0% +20% 1 mA < 2 mA
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Short Circuit
Current
Continuity
Measurement
Range
0.00 Ω to 19.99 kΩ
Accuracy Open Circuit
± (3% + 2
digits)
> 4 V
< 10 V
Short Circuit
Current (at 2 Ω)
> 200 mA 4 Ω 550 V Fused
RCD
System
Voltage
System Voltage
Range
195 – 253 V ac 50-60 Hz 30, 100, 300, 500 50 V ± (1% + 1ms) 550 V
Accuracy at Applied Test Current
30
Test Current Accuracy
½ +0% -10%
x 1 +10% -0%
x5 (30mA only) +10% -0%
(Ramp) ± 5% of rated IΔN
Frequency
Nominal Currents
(mA)
Fault /
Touch
Voltage
Ramp Characteristics: 20% to 110% of rated IΔN in 10% steps (300ms dwell time)
Operating Ranges and Uncertainties According to EN 61557
Function Display Range
Insulation
Resistance
0.001 MΩ - 1000MΩ 0.1MΩ – 1000MΩ 1.6%
EN 61557-2
Loop
Impedance
0.01Ω - 500Ω 1.04Ω - 470Ω
EN 61557-3
EN 61557
Measurement Range
EN 61557
Operating
Uncertainty
Hi-I: 4.8%
No=Trip: 10.8%
Max Lead Null
Resistance
Trip Time
Accuracy
U
Over Voltage
Protection
Over Voltage
Protection
(BS EN 61557-10)
Nominal Values
= 250 / 500/
U
N
1000 V dc
1
= 1.0mA
N
= 230/400 V ac
N
f = 50/60 Hz
f = 50/60 Hz
Continuity
EN 61557-4
RCD
EN 61557-6
0.00Ω – 20kΩ 0.1Ω - 10kΩ 10%
ΔT : 5ms – 2000ms
ΔT : 38.2ms –
214.8ms
IΔN IΔN : 15mA – 500mA IΔN : 7%
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ΔT : 0.8%
4.0 V dc < UQ < 24 V dc
R
≤ 2.00Ω
LO
I
≥ 200 mA
N
= 30 / 100 / 300 /
I
ΔN
500 mA
Operating Uncertainties
Insulation
Inuence Quantity
A – Intrinsic Uncertainty 0.8% 0.9% 1% 5.6% 14.4%
E1 – Position 0% 0% 0% 0% 0%
E2 – Supply Voltage 1.0% 0.8% 10% 0.3% 1.3%
E3 - Temperature 0.8% 4.9% 0.7% 2.1% 2.9%
E6 – System Phase
Angle
E7 – System Frequency - 0.4% - - -
E8 – System Voltage - 1.4% - 0.6% 1.6%
E9 – System Harmonics - 0.8% - - -
E10 – System D.C
Quantities
Resistance
Inuence
Quantity
- 2.4% - - -
- 8.4% - - -
Loop
Impedance
ZI
EN 61557-3
Continuity
RLO
EN 61557-4
RCD
ΔT
EN 61557-6
RCD
IΔN
EN61557-6
31
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32
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
expresscal@Kewtechcorp.com
Kewtech Corporation Limited
Midas House, Unit 2b, Stones Courtyard, High Street, Chesham, Bucks HP5 1DE
01494 792212
sales@Kewtechcorp.com
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