Instruction Manual
Contents
1. N LE miswire L N Warble 7 Faulty N E miswire N L Warble 8 Faulty N E L Warble 9 Faulty N LE reverse L E Warble 10 Faulty E L N reverse NC N Warble 11 Faulty E NC L Warble 12 Faulty E N miswire NC L Warble 13 Faulty E L N miswire E Warble 14 Faulty L N E miswire Warble 15 Faulty L E miswire Warble 16 Faulty L N E miswire Warble 17 Faulty L N miswire Warble 18 No Mains None Above is the indication given when touching the touch pad LEDs will flash to indicate fault condition NC No Connection Kewtech Corporation Limited Midas House Unit 2b Stones Courtyard High Street Chesham Bucks HP5 1DE T 01494 792 212 F 01494 791 826 E sales kewtechcorp com www kewtechcorp com2. an audible alternating tone and the LEDs at least one of which will be red or orange will flash If a fault indication is given DO NOT PROCEED investigation and remedial action is required before you can conduct a loop test If this happens placing your thumb on the grey coloured polarity test pad will now activate the fault location function With your thumb firmly on the pad check the indication given by the LEDs against the chart on the back cover to identify where the main problem lies Note The colour of the LEDs may change when the pad is touched Incoming supply Polarity Test this important test is discussed in full on page 3 of this manual please read To conduct the test with all three LEDs lit GREEN place your thumb on the grey coloured polarity test pad area If the supply polarity is correct there will be no change in indication and you can proceed to step 4 If the supply polarity has been reversed the three LEDs will turn red and flash If this happens stop testing and notify the supply company immediately Check that the mains voltage is in the correct range 207 253V AC Note All tests are inhibited until the mains voltage appears in the display NO TRIP Your tester defaults to no trip loop testing when you first switch on button five re selects no trip loop test if you have selected other functions TEST A brief press of the test button will initiate the loop test and after a few seconds t
3. KEW TECH KTD40 Multifunction Digital Loop Impedance Tester User Manual 3 www kewtechcorp com The Kewtech KTD40 Loop Impedence Tester is designed for use by suitably qualified personnel familiar with electrical supply systems A Caution Before using your KTD40 please read these instructions in particular note the safety issues that follow e Although fully protected up to 440V AC this tester is for use on 230V AC circuits only e Always check the tester on a known correctly wired live socket outlet before and after use e Before use check your tester for any damage to the plug lead and cabinet Important calibration check box note e Because of the Super Smart Loop Test System the test is immune to sudden value changes such as voltage spikes e As a result when changing calibration or check box loop values the unit must be switched off between changes BSEN610101 At Kewtech our engineers constantly look for improvement If there is any aspect of your Kewtech tester you would like to comment on please visit our website at Kewtechcorp com Operation Overview Your Kewtech tester has a special polarity test function It is a little known fact that a system can be reverse wired with Line Phase to earth neutral and earth neutral to Line Phase The sockets will all work and conventional loop testers will show and test that everything is correct despite this very dangerous wiring condition Alth
4. al 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 or the supply should be powered off between consecutive tests Where practical other equipment powered by the same socket should be turned off For safety reasons No trip mode is recommended for all measurements made on TT systems Test lead configuration Important The KTD40 can be used with 2 different types of connecting lead It is important to understand and use the correct lead configuration for each test mode or you may not obtain the correct results Lead options 1 Ref KAMP13 The mains lead IEC C13 to 13A plug type connector that is supplied with the tester 2 Ref ACCO16E The 3 Pole fused distribution board test lead set which terminates in fused prods crocodile clips This is supplied as a separate accessory to the KTD40 The lead is 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 fused test lead set as it would be likely to give incorrect results Lead configuration for No trip testing This is the default mode that the KTD40 will start in when turned on This mode is most useful for testing at socket outlets luminaires wiring terminals etc in installations where the circuit under test may be protected b
5. he result will be displayed Important see notes on page 4 The KTD40 also has a HANDSFREE test function that is activated by pressing the test button before connecting to the mains supply This is very useful for testing at luminaires or similar connecting strips when your hands are occupied by holding the test probes 10 Loop PFC PSC Testing continued 10 When using HANDSFREE mode with the distribution board test lead set always connect the Earth and Neutral poles before the Line otherwise it will indicate a polarity fault and inhibit further testing HANDSFREE testing in No trip mode The tester will automatically conduct the socket wiring test upon connection to the Live supply If all is well it will immediately initiate a Loop test When the test is complete the result will be displayed for a few seconds before the display reverts to showing the L N voltage The Loop test result can be recalled by pressing the No trip button and the PFC PSC result can be recalled by pressing the No trip PFC button Having carried out a No trip Earth fault loop test pressing this button calculates the PFC Prospective Fault Current by dividing the measured loop result into the measured L E voltage VOLTAGE The default voltage measurement is made between L N Using this button you can override to measure L E and as a final safety check measure the N E voltage present Ze DB This button selects the High Current True L
6. l by use of Polarity Test Pad Phase Neutral voltage measurement 1 1V Phase Earth voltage measurement 1 1V eutral Earth voltage measurement 1 1V Loop Test 11 o trip mode 3 wire testing Phase Neutral Earth all connected Test current lt 15mA at 253V AC Range Accuracy 0 00 to 9 990 5 5 digits 10 00 to 99 90 3 3 digits 100 00 to 5000 3 3 digits High current mode 2 wire testing Phase Neutral or Phase Earth connected using true impedance measurement auto test hands free is selectable Range Accuracy 0 00 to 9 990 3 3 digits PFC PSC Measurement 10A 19 9kA This is a calculated result using the loop test measurement but it will be inherently more accurate than traditional methods as the test is of impedance not solely resistance Over Voltage Protection 440V AC Power 4 x AA batteries not included Battery life BS EN 61557 gt 10 000 test or shelf life of batteries installed Environmental No damage complete recovery Operating Temperature Range 0 C to 40 C Storage Temperature Range 10 C to 60 C Operating Humidity 93 RH 40 C Size 157mm x 89mm x 39mm Weight 400g Condition Wiring Supply LED Buzzer Number Condition Terminal Display 1 Correct E L Continuous 2 LE reverse L E Warble 3 LN E miswire L N Warble 12 4 L N reverse E N Warble 5 LN E miswire N 3 Warble 6 Faulty
7. on No trip loop select default VOLTAGE NO TRIP PFC No trip PFC prospective fault LAE E current Voltage select L N default L E and N E 9 High current 10 High current 3 Polarity Test 6 Push to start test loop impedance PFC test test ao gt TASC TFT TO nmo Loop reading selected Q PFC PSC prospective fault current prospective short circuit current reading selected A kA Loop test mode selected no trip default or Hi l high current HANDSFREE operation Ohms symbol Volts AC Voltage measurement function L N default L E and N E Fault current Wait result calculation in progress Wait tester has gone over operating temperature Battery Condition AWA good Greater than gt less than lt indication Loop PFC PSC Testing 1 Power ON OFF Pressing this button turns the KTD40 on and pressing again turns the unit off Intelligent auto power off occurs after 3 minutes of inactivity but for safety the instrument stays powered if it is displaying a socket wiring fault a When the KTD40 is first connected to a live socket it will automatically test the socket wiring to establish that the circuit wires have been connected to the correct terminals on the back of the socket If all three LEDs light GREEN and no sound is emitted the wiring status is correct and you can proceed to the incoming supply polarity test step 3 A fault with the socket wiring will be indicated by
8. oop Impedance mode Use only with the test lead set configured for 2 wire mode see page 6 Connect the test leads to the two conductors being tested The supply voltage see step 8 will be displayed A brief press of the test button will conduct the Loop test and the result will be displayed almost immediately Note In 2 wire mode the voltage displayed will be that measured across the 2 conductors that the test leads are connected to The display will show this as L N regardless of whether they are connected across L N or L E HANDSFREE testing in High current 2 wire mode This function is particularly useful for testing at distribution boards and is activated by pressing the test button before connecting to the mains supply The KTD40 will then automatically conduct a Loop test upon connection to the live supply and display the result The supply voltage can be recalled by pressing the Voltage button and the PFC PSC result can be recalled by pressing the No trip PFC button PFC PSC Prospective Fault Current Prospective Short Circuit Current Pushing this button divides the above TLI True Loop Impedance result into the voltage measured between the two points under test to give either the prospective short circuit current when L N is tested or the prospective earth fault current when L E is tested Specifications Wiring Test Detects missing E or N gt 15kQ Detects L E or LN swap Detects Live Earth Neutral reversa
9. ough extremely rare this miswire 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 See test step 3 page 9 CORRECT POLARITY Typical supply service cut out fuse From supply WE phase company LINE Phase to meter Neutral to meter To main earthing terminal Solid brass connecting block REVERSE POLARITY Typical supply service cut out fuse From supply NEUTRAL company Neutral to meter LINE Phase to meter To main earthing terminal Solid brass connecting block Operation overview The KTD40 will test for No trip loop High current True Loop Impedance No trip PFC PSC Prospective Fault Current High current PSC using True Loop Impedance mains voltage L N L E and N E and correct socket wiring in addition to the incoming supply polarity check described on the previous page Another unique feature of your KTD40 tester is the high current 2 wire measurement of the TLI True Loop Impedance Regulations and guidance books refer to loop impedance measurements but up until now loop testers measured loop resistance which is different from loop impedance particularly when testing close to the main supply transformer This function is therefore recommended when testing for external earth fault loop impedance Ze at distribution boards on non TT systems and similar points on the su
10. pply side of any Switch RCD gear and when testing the Line Neutral loop to determine prospective short circuit current It is the variation in power factor that makes the TLI measurement of your KTD40 so much more accurate than older loop testing techniques Because of this there may well be variations in readings compared to ordinary loop testers or the no trip function of this tester particularly when the measurement is made near to the main supply transformer The KTD40 also has a No trip test mode that is guaranteed not to trip a 30mA or higher rated RCD providing that the circuit is otherwise healthy No trip vs High current testing Although the KTD40 High current TLI measurement mode is inherently more accurate than conventional techniques when measuring close to the main supply transformer the difference between resistance and true impedance reduces the further away from the transformer the measurement is made This is why using the No trip mode is suitable for measurement on final circuits and similarly remote points It should be noted however that whilst No trip testing at these locations will normally function at a similar high level of accuracy the low current measurement technique used is more likely to be adversely affected by external factors such as contact resistance e g when testing at seldom used socket outlets and circuit noise e g switched mode power supply on the same circuit This can result in the occasion
11. y an RCD In No trip mode the tester can be used with the mains lead when testing at 13A socket outlets or the distribution board lead set for testing at other points in the circuit When testing with the KTD40 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 This mode can be re selected at any time by pressing button 5 labelled No trip Test lead configuration Operation a Detailed View of the KTD40 Lead configuration for High Current 2 wire testing with TLI feature The TLI True Loop Impedence function is intended for use at distribution boards and similar points where you are measuring on the supply side of any Switch RCD gear The TLI measurement function is selected by pressing button 9 labelled Ze DB This function uses the maximum high current of the tester and requires the use of the distribution board lead set configured in 2 wire mode Do not use this function with the mains lead or the distribution lead set in 3 wire mode Three LEDS show socket wiring 6 To arrange the test leads in 2 wire mode pull the blue prod off the blue test lead and status plug the exposed 4mm connector into the back of the green connector as shown below You will now have the Earth and Neutral leads connected together ready for connection to the Earth or Neutral conductor to be tested LCD default L N voltage measurement On Off butt
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