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Summary of Contents for Kewtech KT41
- Page 1 KEWTECH KT41/KT42 digital multi function testers Instruction manual...
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Page 2: Table Of Contents
RCDs rated at 10mA or less the ATT circuits may not function. If there is doubt as to whether this tester will by-pass a particular RCD, contact Kewtech with details of manufacturer, model no., rating and sensitivity. Please read this instruction manual carefully before using... -
Page 3: Safety Notice
1.6 If the overheat symbol appears in the display disconnect the instrument from the mains and allow to cool down. 1.7 When using the KT41 all RCDs in the circuit must be by- passed for the duration of the test. Do not operate the RCD Test button with the RCD by-passed. - Page 4 1.15 Replace worn and/or damaged leads with new ones approved by Kewtech immediately. Only use accessories recommended by Kewtech as they are designed to work with the tester. The use of any other items is prohibited as...
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Page 5: Features And Principles Of Measurement
they may not have the same safety features built in. 1.16User of this equipment and/or their employers are reminded that Health and Safety Legislation require them to carry out valid risk assessments of all electrical work so as to identify potential sources of electrical danger and risk of electrical injury such as from inadvertent short circuits. - Page 6 allow automatic disconnection of the electrical supply by the circuit protection device within a prescribed time interval. Every circuit must be tested to ensure that the earth fault loop impedance value does not exceed that specified or appropriate for the over-current protective device installed in the circuit. For a TT system the earth fault loop impedance is the sum of the following impedances;...
- Page 7 In accordance with the international standard IEC 60364 for a TT system the following condition shall be fulfiled for each cir- cuit. must be ≤ 50/la where; is the sum of the resistances of the local earth system R and the protective conductor connecting it to the exposed conduc- tor part.
- Page 8 For this example the maximum value is 1667Ω, the loop tester reads 12.74Ω and consequently the condition R is ≤ 50/Ia is met. It is also important to test the operation of the RCD using a dedicated RCD tester in accordance with the international standard IEC60364 for a TN system.
- Page 9 Rating Disconnecting time 5s Disconnecting time 4s Ia (A) Zs (Ω) Ia (A) Zs (Ω) 1.56 1.25 1.53 0.83 1.21 0.72 0.92 0.49 0.71 0.42 0.54 0.27 0.39 1020 0.22 If the prospective fault current is measured, its value must be higher than the Ia value of the protective device concerned.
- Page 10 2.3 Principles of the measurement of line impedance and prospective short circuit current Line impedance on a single phase system is the impedance measured between phase and neutral terminals. Measurement principles for line impedance are exactly the same as for earth fault loop impedance measurement with the exception that the measurement is carried out between phase and neutral.
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Page 11: Specifications
Specifications Measurement specification Loop impedance Nominal test Measuring Intrinsic Range current at 0Ω external range accuracy loop/Period applied 20Ω 0.00-19.99Ω 25A/20ms 200Ω 0.0-199.9Ω 2.3/40ms ±(2%rdg+3dgt) 2000Ω 0-1999Ω 15mA/280ms Prospective Short-circuit Current Nominal test Measuring Intrinsic Range current at 0Ω external range accuracy loop/Period applied... - Page 12 195V to 253V General specification Storage temperature: -5˚C to 60˚C Storage humidity: 85% maximum Dimensions: 175 x 115 x 85.7mm Weight: KT41 - 500g KT42 - 700g Maximum altitude: 2000m Over range indication: ‘OL’ Input voltage greater than 260V indication: ‘VP-E Hi’...
- Page 13 SLP5 Earth probe SL16E Distribution board fused test lead (Fuse: 10A/600V fast acting ceramic) Test lead carry pouch Model KT42 KT41 Anti trip technology* Loop 0-19.99Ω/ 0-199.9Ω/0-1999Ω PSC 0-199.9A/ 0-1999A/0-4.00kA Mains Lead for Sockets KAMP10UK ACC016E ACCEP5 External Earth Probe SLP5 Distribution Board Lead SL16E *ATT does not operate on the 2000Ω...
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Page 14: Instrument Layout
Instrument layout LCD display Main status indication Range switch Test button... - Page 15 Test leads KAMP10UK ACC016E ACCEP5 LCD display...
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Page 16: Operating Instructions
Always inspect your test instrument and lead accessories for abnormality or damage- If abnormal conditions exist DO NOT PROCEED WITH TESTING. Have the instrument checked by Kewtech. Before pressing the test button, always check the LED's for the following sequence:... - Page 17 Connect the mains lead to the IEC socket of the instrument Plug the moulded plug of the mains lead into the socket to be tested Carry out the initial checks Press the test button. A beep will sound as the test is conducted and the value of loop impedance will be displayed Wait for the display to indicate the input voltage...
- Page 18 Loop impedance at the distribution board Warning: never connect 2 phases to this instrument Select the 20Ω, 200Ω or 2000Ω range as required Connect the distribution board lead model ACC016E to the IEC socket on the instrument Connect the red phase lead of the ACC016E to 1 phase of the distribution board, the black neutral lead to the neutral of the distribution board and the green crocodile clip to the earth...
- Page 19 nected to the neutral of the system i.e. the same point as the black neutral probe. If the system has no neutral then you must connect the black neutral probe to the earth i.e. same point as the green earth clip.
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Page 20: Servicing & Calibration
12 month interval. When this is due for re-calibration return it to Kewtech marked for the attention of the Calibration Department and be sure to include all accessory leads, as they are part of the calibration procedure. - Page 21 10A/600V high rupture ceramic types. If they should blow always return the instrument to Kewtech for checking. The fuses are special and should only be replaced by equivalent types. Returning the product to Kewtech will ensure this.
- Page 22 Case, strap, shoulder-pad and test lead pouch assembly Assemble the shoulder strap through the case lugs and the test lead pouch in the following sequence: 1 Pass the strap down through the first lug, under the case and up through the other lug. 2 Slide the shoulder pad onto the strap 4 Pass the strap through the buckle,...
- Page 23 Distributor Kewtech Corporation Limited 76 St. Catherine’s Grove Lincoln LN5 8NA KEWTECH www.kewtechcorp.com 92-1616 04-03...
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