User Manual
Contents
1. DET3TC Current Potential Current Installation clar spike spike earthing Earth system conductor under test Figure 10 Connection for measuring three terminal ground rod resistance 1 With the selector switch in the OFF position connect the instrument as shown in Figure 10 and close the ICLAMP around the earthing conductor under test 2 Set the selector switch to the setting marked 3P CL 3 Press and release the TEST button by pressing and holding the TEST button the resistance measurement will be continually updated and displayed 15 4 The instrument will then check for ground noise voltage the parameters of the current and voltage circuits and the integrity of the fuse 5 A resistance measurement reading is displayed as shown in Figure 11 Coit Ju Rp Rc Noise Toco Figure 11 Three point resistance reading using ART 16 DESCRIPTION OF TESTS FOR MODEL DETS3TA Battery life reading DET3TA 1 Set the selector switch to 2 Press and hold the TEST button 3 The battery life will be indicated in the analogue display on the scale marked with the as shown in Figure 12 4 Release TEST button Figure 12 Analogue display indicating remaining battery life Ground noise voltage measurement DET3TA 100v 9 128Hz A Potential spike Earth system under test Figure 13 Connections for measuring ground noise voltage and two terminal resistance 1 With the sel2. Megger DET3TA DET3STC DET3TD and DET4TD Earth Ground Electrode Testers USER MANUAL cree WARNINGS Safety Warnings and Precautions must be read and understood before the instrument is used They must be observed during use Do not leave the instrument connected to the system under test when not in use m Circuit connections and exposed metalwork of an installation or equipment under test must not be touched m The instrument must not be operated or connected to any external system if it shows any visible signs of damage or if it has been stored for prolonged periods in unfavourable conditions m The instrument must not be operated or connected to any external system if the battery compartment or casing is open or any parts of the case CGincluding keypad selector switch display window etc are missing m The earth spikes test leads and their terminations including connections to the earthing system under test must not be touched if an installation earth fault can arise unless adequate precautions are taken m The earth spikes test leads and their terminations including connections to the earthing system under test must not be touched while the instrument is switched on m Special precautions are necessary when operating in situations where live earths may be encountered isolation switches and fuses not supplied with this instrument must be used m Special precautions are necessary when working near high tension s
3. T 61 0 2 9659 2005 F 61 0 2 9659 2201 E ausales megger com Megger Megger Limited 110 Milner Avenue Unit 1 Scarborough Ontario M1S 3R2 Canada T 1416 298 9688 Canada only T 1416 298 6770 F 1416 298 0848 E casales megger com
4. if the test leads are connected 3 To avoid the possibility of electric shock do not press the test button or touch the fuse when changing batteries 4 To remove the rear cover release the screw at the bottom of the cover and lift the cover upwards 5 Remove the dead cells 6 Refit new batteries observing the correct polarity as marked on the battery compartment 7 Replace the instrument back cover and secure by tightening the retaining screw Warning Incorrect battery cell polarity can cause electrolyte leakage resulting in damage to the instrument If the battery condition indicator does not show a full charge when battery cells are new a cell may be reversed Note Battery cells should not be left in an instrument that may remain unused for extended periods MEGGER S DOWN TO EARTH PUBLICATION The following descriptions of tests are a set of instructions for the sole Fuse Fuse type 500 mA F HBC 50 kA 600 V 2 x 6 mm Blown fuse symbol DET3TD DET3TC and DET4TD Only one fuse is contained within the instrument and is user replaceable When the fuse ruptures symbol will show and testing is inhibited To replace the fuse Warning Do not operate instrument with the battery cover removed 1 To avoid the possibility of electric shock switch instrument OFF and disconnect the instrument from any electrical circuits 2 The rear cover must not be opened if the test leads are connect
5. necessary the instrument can be cleaned with a damp cloth 5 Do not use alcohol based cleaners as these may leave a residue TECHNICAL SPECIFICATION General Specification Only values with tolerances or limits are guaranteed data Values without tolerances are for information only Resistance Measurement Range 0 01 Q to 2 000 Q Accuracy 2 3 digits DET3TC DET3TD DET4TD 2 5 of scale length DET3TA Voltage Measurement Range 0 V to 100 V Accuracy 2 3 digits DET3TC DET3TD DET4TD 2 5 of scale length DET3TA Current measurement DET3TC only Range 0 5 mA to 19 9 A Accuracy 5 3 digits Temperature and Humidity Operating Range 15 C to 55 C Storage Range 40 C to 70 C Environmental Protection IP54 Safety Meets the requirements of EN61010 1 100V CAT IV between terminal pairs EMC In accordance with IEC61326 including amendment No 1 19 Power Supply Dry cell 8 x LR6 AA 1 5 V Alkaline Rechargeable 8 x 1 2V NiCAD or 8 x 1 2V NiMH Battery life Approx 700 consecutive tests Fuses 500 mA F HBC 50 kA 600 V 32 x 6 mm Weight and Dimensions Weight 1kg all units Dimensions 203 x 148 x 78 mm all units 20 The instrument contains static sensitive devices and care must be taken in handling the printed circuit board If an instrument s protection has been impaired it should not be used but sent for repair by suitably trained and qualified personnel The protectio
6. version that makes provision for 2 and 3 point measurements The DET3TC can use an optional current clamp ICLAMP to measure electrode rod resistance without disconnection leaving the installation earthing system intact Attached Rod Technique ART The DET3TC in conjunction with the current clamp can also measure conductor current The DET variants have the following features Feature DETSTA DET3TC DET3TD DET4TD Automatic C spike check a Automatic P spike check a Manual P spike check Automatic noise check Manual noise check Noise rejection 40 V pk pk 2 wire test o 4 wire test E 4 wire test E No disconnect testing ART Voltmeter ground noise voltage measurement Feature DET3TA DET3TC DET3TD DET4TD Current measurement fl LCD display o e Moving coil meter Pe fo IP54 rated pe a a EN61010 1 100 V CATIV pw a fw o Each instrument kit comprises instrument test leads test spikes batteries and calibration certificate stored in a tough polypropylene carrying case INSTRUMENT ILLUSTRATIONS DET3TA Test lead connections Multi function at rear analogue display Rc OK Resistance measurement settings 2P and 3P P Spike button Selector switch Test button Battery check setting and voltage setting Resistance scale 25 10 100 1 1000 40 60 10 20 80 0 1 oO 0 100 Q Voltage scale V FP Potential test spike te resistance indicator Test lead connections
7. ND FUSES Batteries Battery type 8 x LR6 AA 1 5 V Alkaline or 8 x 1 2 V NiCAD or 8 x 1 2V NiMH The battery condition is continuously displayed by the bar graph type symbol DET3TC DET3TD and DET4TD or by switching to the battery setting and pressing the TEST button DET3TA Figure 1 shows the progression of the battery indicator for the DET3TC DET3TD and DET4TD which gives a qualitative status of the battery charge condition Sa a Fully charged battery Ee Cc a E Sa E 75 charged battery Cc Sa Sa Sa a 50 charged battery D Cc a 25 charged battery N E SS s m Some testing still possible but battery may fail at any time ALU i do a test and the instrument will turn itself off a N Symbol flashes when there is not enough charge to 5 oo Figure 1 Battery life indication DET3TC DET3TD DET4TD 10 Note Fully charged NiMH or NiCAD rechargeable batteries show a lower charge than alkaline batteries and may not give much warning before becoming exhausted To replace batteries Warning Do not operate instrument with the battery cover removed 1 To avoid the possibility of electric shock switch instrument OFF and disconnect the instrument from any electrical circuits 2 The rear cover must not be opened
8. ST button Ji Switch off instrument when the desired maximum test voltage is displayed Auto power down To extend battery life the instrument will automatically switch off six minutes after the last operation The instrument can be switched off manually by selecting the OFF setting on the selector switch and then switched on as normal Display symbols DET3TC DET3TD DET4TD A Warning Triangle g Fuse Blown ill Battery Indicator not DET3TA gt 100V Indicates that the ground noise voltage exceeds the instrument measurement capability Rp OK Potential spike P Spike is within range for accurate measurement lt 100 KQ Rp Hi Potential spike P Spike resistance exceeds range for accurate measurement gt 100 kQ Rc OK Current spike C Spike is within range for accurate measurement lt 100 kQ Rc Hi Current spike C Spike resistance exceeds range for accurate measurement gt 100 kQ Noise OK Ground noise voltage is within range for accurate measurement lt 40 Vpk pk Noise Hi Ground noise voltage exceeds range for accurate measurement gt 40 Vpk pk Display symbols DET3TA O Current spike C Spike is within range for accurate measurement lt 100 kQ Re Ye Instrument is performing measurement checks Re Note Re and Rp limit reduced to 50 KQ for 25 V output Re and Rp limit reduced to 5 kQ on 18 Q range to achieve 0 01 Q resolution REPLACING BATTERIES A
9. a 0 reading is obtained on the instrument display 6 Close clamp around the lead connecting the X and C terminals 14 7 Press and hold the TEST button until a 100 reading is obtained 8 The instrument is now calibrated to the particular ICLAMP 9 Switch the instrument to the OFF position Measuring ground current with the ICLAMP DET3TC DET3TC a8 8 anna 4 Current clamp Installation Earth electrode __ earthing rod under test conductor Figure 8 Connections for measuring current using the current clamp 1 With the selector switch in the OFF position connect the instrument as shown in Figure 8 and close the ICLAMP around the earthing conductor under test 2 Turn the selector switch to the current measuring setting marked A 3 The instrument will display a measured current value as shown in Figure 9 AE L E 3 Figure 9 Current reading using the current clamp Attached Rod Technique ART DET3TC It is possible to use this instrument to measure the resistance of a ground rod without disconnecting it from the rest of the system thereby allowing normal operations within the installation to continue uninterrupted This technique is known as the Attached Rod Technique ART Where the means of grounding comprises multiple rods this technique also allows individual measurement of each rod Measuring ground resistance with the ICLAMP using ART DET3TC
10. at rear of instrument DET3TC Test lead connections Digital LCD display at rear Resistance measurement settings 2P 3P and clamp Test button Selector switch Voltage and current measurement settings Warning refer to rl manual Se N m indicator Measuring range OBH gi a Clamp current indicator A ok or low Ruptured fuse indicator Battery charge a indicator Over under range Potential probe 7A cf ict resistance indicator OK or high Current Z resistance Ground noise voltage OK or high indicator OK high eo 128Hz Test lead connections at rear of instrument DET3TD Digital LCD display Test lead connections ym at rear Resistance measurement settings Test button 2P and 3P Selector switch Voltage measurement settings Warning refer to User manual indicator SNS Ruptured fuse _Aattery charge ndicator JANIN Over under range A 4 6 AAA pak Refi Noisegi Measuring range ko Potential probe resistance indicator OK or high Current probe resistance OK or high Ground noise voltage indicator OK high ec 128Hz Test lead connections at rear of instrument DET4D Digital LCD display Test lead connections at rear of instrument Resistance measurement settings 2P 3P and 4P Megger DET4TD Test button Selector switch Voltage measurement settings Warning refer to user ga
11. charger Ruptured os ge indicator indicator aii ee 7 ee ranges range indicato amp gt Potential probe d resistance ORO ae or pok Rcg en high Ground noise voltage Current probe indicator OK or high resistance indicator OK or high Test lead connection at rear of instrument e PREPARATIONS FOR USE ALL INSTRUMENTS Batteries The Megger DET series instruments are supplied with batteries fitted When batteries become exhausted refer to the section on battery replacement Warning Do not switch the instrument on with the battery cover removed Inspection Before each use of the instrument visually inspect the instrument case test leads spikes and connectors to confirm that their condition is good with no damaged or broken insulation GENERAL OPERATING INSTRUCTIONS ALL INSTRUMENTS Instrument output voltage selection The maximum output voltage of the instrument is nominally 50 V Should it prove necessary in particular circumstances it is possible to set the output voltage 25 V The procedure for changing the output voltage is as follows 1 Press and hold the TEST button and switch instrument ON to the V setting on the selector switch The LCD display will indicate ts CDET3TC DET3TD and DET4TD QO N Release TEST button The maximum output test voltage will be displayed either 50 V or 25 V os To toggle between the maximum output test voltages press the TE
12. e address If appropriate a copy of the original purchase invoice and of the packing note should be sent simultaneously by airmail to expedite clearance through customs For instruments requiring repair outside the warranty period a repair estimate will be submitted to the sender if required before work on the instrument commences Approved Repair Companies A number of independent instrument repair companies have been authorised for repair work on most Megger instruments using genuine Megger spare parts A list of approved companies is available from the UK address shown on this page Spare parts are also available 21 Megger Limited Archcliffe Road Dover Kent CT17 9EN England T 44 0 1 304 502101 F 44 0 1 304 207342 E uksales megger com Megger 4271 Bronze Way Dallas Texas 75237 1019 USA T 1 800 723 2861 USA ONLY T 1 214 333 3201 F 1 214 331 7399 E ussales megger com Megger products are distributed in 146 countries worldwide This instrument is manufactured in the United Kingdom The company reserves the right to change the specification or design without prior notice Megger is a registered trademark Part No DET3TA_DET3TC_DET3TD_DET4TD V04 10 13 www megger com Megger Z A Du Buisson de la Couldre 23 rue Eug ne Henaff 78190 TRAPPES France T 33 0 1 30 16 08 90 F 33 0 1 34 61 23 77 E infos megger com Megger Pty Limited Unit 26 9 Hudson Avenue Castle Hill Sydney NSW 2125 Australia
13. ector switch set to the OFF position connect the instrument as shown in Figure 13 2 Set the selector switch to the ground noise voltage setting marked V 3 A voltage reading will be indicated on the analogue display as shown in Figure 14 Figure 14 Analogue display indicating ground noise voltage measurement Two terminal resistance measurement DET3TA 1 With the selector switch in the OFF position connect the instrument as shown in Figure 13 but connected to the part of the installation you are testing 2 Set the selector switch to the 2 point resistance measurement setting marked 2P 3 The ground noise voltage is indicated on the analogue display 4 If the ground noise voltage is within acceptable limits press and hold down the TEST button 5 The instrument will then check for ground noise voltage the parameters of the current and voltage circuits and the integrity of the fuse during which time the Rc LED will flash 6 A resistance reading will be indicated on the analogue display as shown in Figure 15 Figure 15 Resistance reading between X and Y terminals Three terminal resistance measurement DET3TA p Potential Current spike spike Earth system under test Figure 16 Connections for measuring three terminal ground rod resistance 1 With the selector switch in the OFF position connect the instrument as shown in Figure 16 2 Set the selector sw
14. ed 3 To avoid the possibility of electric shock do not press the test button when replacing the fuse 4 To remove the rear cover release the screw at the bottom of the cover and lift the cover upwards 5 Disconnect the battery circuit before accessing the fuse 6 Remove fuse and replace it with of fuse of the same characteristics 7 Replace the instrument back cover and secure by tightening the retaining screw purpose of the proper use of these instruments by competent persons Where there is doubt about a particular application reference should be made to the advice and guidance contained within the publication Down to Earth available from Megger DESCRIPTION OF TESTS FOR MODELS DET3TC DET3TD DET4TD Battery Before proceeding with measurements ensure that the charge condition of the batteries is sufficient to undertake the intended measurements The charge status is given in the bar graph as shown in Figure 1 which is continually shown on the LCD when the instrument is switched on Measurement of ground noise voltage DET3TC DET3TD and DET4TD DET3TD DET3TC DET4TD Test spike Test spike Test spike Earth electrode Earth electrode Earth electrode rod under test rod under test rod under test Figure 2 Connections for measuring ground noise voltage and two terminal resistance 11 To measure the ground noise voltage 1 With the selector switch set to the OFF position connect the ins
15. ircuit it is protecting so that only the earth is measured and not the complete system When this is done the circuits and equipment must be de energised If however this is not possible the earth electrode should be duplicated so that when it is disconnected for test purposes the other one provides the necessary circuit protection The following safety precautions are essential when working near high tension systems where any unintentional live earths may be encountered between the site earth and remote earths established for test purposes A live earth is one that carries current from the mains supply or could do so under fault conditions 1 All persons involved must be trained and competent in isolation and safety procedures for the system to be worked on They must be clearly instructed not to touch the earth electrode test spikes test leads or their terminations if any live earths may be encountered It is recommended that they wear appropriate rubber gloves rubber soled shoes and stand on a rubber mat 2 The P CS and C CH terminals should be connected through a double pole isolation switch the rating of which will cope with the maximum fault voltage and current The isolation switch must be open whilst any personal contact is made with the remote test spikes or the connecting leads e g when changing their position Note If a fault occurs while a test is being made the instrument may be damaged Incorpo
16. istance reading will be displayed on the LCD display as shown in Figure 6 Ground resistance measurement DET4TD r F P Current Potential Potential Current spike spike spike spike Figure 7 13 Connections for measuring four terminal soil resistance 1 With the selector switch in the OFF position connect the instrument as shown in Figure 7 2 Set the selector switch to the 4 point resistance measurement setting marked 4P 3 Press and release the TEST button by pressing and holding the TEST button the resistance measurement will be continually updated and displayed 4 The instrument will then check for ground noise the parameters of the current and voltage circuits and the integrity of the fuse 5 A resistance reading will be displayed on the LCD display as shown in Figure 6 Calibrating the instrument to the ICLAMP DET3TC Before proceeding with any measurement using the ICLAMP it is essential to calibrate the instrument to the particular ICLAMP using the following procedure This calibration should be repeated periodically 1 With the selector switch in the OFF position connect ICLAMP to instrument 2 Press and hold the TEST button and switch instrument ON to the A setting on the selector switch 3 Release TEST button 4 Connect terminals X and C on the instrument together with the lead provided with the ICLAMP 5 Press and hold down the TEST button until
17. itch to the 3 point resistance measurement setting marked 3P 3 The ground noise voltage is indicated on the analogue display 4 If the ground noise voltage is within acceptable limits push and hold 17 down the P Spike button 10 Continuous illumination of the Rc LED indicates that the resistance of 5 A P Spike resistance reading will be indicated on the analogue the current circuit is within limits display 11 A resistance reading will be indicated on the analogue display as 6 If the P Spike resistance is within acceptable limits as shown in Figure shown in Figure 15 17a within the Green region on the Rp scale release the Spike 12 On completion of measurement release the TEST button button Figure 17b P Spike NOT OK in red zone 7 Press and hold down the TEST button 8 The instrument will then check for ground noise voltage the parameters of the current and voltage circuits and the integrity of the fuse during which time the Rc LED will flash 9 If the Rc LED fails to illuminate solidly and the needle does not move this may indicate that the fuse has blown or that the current probe circuit C Spike resistance is out of limits 18 PREVENTIVE INSTRUMENT MAINTENANCE 1 The DET series instruments require very little maintenance 2 Test leads should be checked before use to ensure there is no damage 3 Ensure batteries are removed if left unused for extended periods 4 When
18. n is likely to be impaired if for example it shows visible damage fails to perform the intended measurements has been subjected to prolonged storage under unfavourable conditions or has been subjected to severe transport stresses NEW INSTRUMENTS ARE GUARANTEED FOR 3 YEARS FROM THE DATE OF PURCHASE BY THE USER Note Any unauthorized prior repair or adjustment will automatically invalidate the Warranty INSTRUMENT REPAIR AND SPARE PARTS For service requirements for Megger Instruments contact Megger Limited or Megger Archcliffe Road Valley Forge Corporate Centre Dover 2621 Van Buren Avenue Kent CT17 9EN Norristown PA 19403 England USA Tel 44 0 1304 502 243 Tel 1 610 676 8579 Fax 44 0 1304 207 342 Fax 1 610 676 8625 or an approved repair company REPAIR AND WARRANTY Returning an Instrument for Repair If it is necessary to return an instrument for repair a returns Authorisation number must first be obtained by contacting one of the addresses shown You will be asked to provide key information such as the instrument serial number and fault reported when the number is issued This will enable the Service Department to prepare in advance for the receipt of your instrument and to provide the best possible service to you The Returns Authorisation number should be clearly marked on the outside of the product packaging and on any related correspondence The instrument should be sent freight paid to the appropriat
19. nce with the ICLAMP DET3TC Attached Rod Technique ART DET3TC Measuring ground resistance with the ICLAMP using the ART DET3TC Description of Tests for Model DET3TA Battery life reading Ground noise voltage measurement Two terminal resistance measurement Three terminal resistance measurement Preventative instrument maintenance Technical specifications Repair and Warranty DO DOWN NN N 10 11 11 11 12 12 15 13 14 14 14 15 15 16 16 16 17 17 19 19 21 Symbols used on the instrument are A E CE Caution refer to accompanying notes Equipment protected throughout by Double Insulation Class ID Equipment complies with current EU directives Equipment complies with C tick requirements INTRODUCTION Thank you for purchasing the Megger Earth Ground Electrode Tester For your own safety and to get the maximum benefit from your instrument please ensure that you read and understand the following safety warnings and instructions before attempting to use the instruments This user manual describes the operation and functions of the DET series of Earth Ground Electrode Testers DES IA DET3TC DET3TD DET4TD GENERAL DESCRIPTION The Megger DET family of test instruments offers a unique solution to the measurement of earth or ground electrode rod resistance and soil resistivity The family has three digital variants which support 2 3 and 4 point DET4TD only testing and one analogue
20. rating fuses at the isolation switch rated at 100 mA and able to cope with the maximum fault voltage will provide some protection for the instrument BATTERY INSTALLATION Caution Whenever battery cells are being fitted or replaced there should be no connections to the instrument terminals The cover to the battery compartment lifts off the rear of the instrument and is held in position by a single captive screw in the base of the instrument To fit or replace battery cells loosen the captive screw and lift away the cover Fit new cells observing the correct polarity as indicated on the battery compartment moulding Replace the cover and tighten the securing screw To avoid damage by leaking electrolyte do not leave cells fitted in an instrument which will remain unused for extended periods of time CONTENTS Safety notices Introduction General description Instrument illustrations Preparations for use all instruments General operating instructions all instruments Replacing batteries and fuses Megger s Down to Earth publication Description of Tests for Models DET3TD DET3TC and DET4TD Battery Measurement of ground noise voltage Two terminal resistance measurement Three terminal ground rod resistance measurement Four terminal ground rod resistance measurement DET4TD Ground resistance measurement DET4TD Calibrating the instrument to the ICLAMP DET3TC Measuring ground current with the ICLAMP DET3TC Measuring ground resista
21. shown in Figure 5 2 Set the selector switch to the 3 point resistance measurement setting marked 3P 3 Press and release the TEST button by pressing and holding the TEST button the resistance measurement will be continually updated and displayed 4 The instrument will then check for ground noise the parameters of the current and voltage circuits and the integrity of the fuse 5 A resistance reading will be displayed on the LCD display as shown in Figure 6 Cm JU Rp Rc Noise Figure 6 Three point resistance and four point resistivity reading Four terminal ground rod resistance measurement DET4TD In circumstances where the lead resistance could introduce unacceptable levels of error the effect can be removed from the measured resistance using the method below 1 With the selector switch in the OFF position connect the instrument as shown in Figure 5 with the lead shown dotted connecting terminal Cl to the earth electrode rod under test 2 Set the selector switch to the 4 point resistance measurement setting marked 4P 3 Press and release the TEST button by pressing and holding the TEST button the resistance measurement will be continually updated and displayed 4 The instrument will then check for ground noise the parameters of the current and voltage circuits and the integrity of the fuse 5 After a short period a resistance measurement reading is displayed 6 A res
22. trument as shown in Figure 2 2 Set the selector switch to the ground noise voltage setting marked V 3 The ground noise voltage reading will be displayed on the LCD display as shown in Figure 3 Figure 3 Ground noise voltage reading Two terminal resistance measurement DET3TC DET3TD DET4TD 1 With the selector switch in the OFF position connect the instrument as shown in Figure 2 but connected to the part of the installation you wish to test 2 Set the selector switch to the 2 point resistance measurement setting marked 2P 3 Press and release the TEST button by pressing and holding the TEST button the resistance measurement will be continually updated and displayed 12 4 A resistance reading will be displayed on the LCD display as shown in Figure 4 Cane Cri m Figure 4 Two point resistance reading L uaj O Note The test voltage used to make resistance measurements is a c and because of this may not suitable for continuity testing in accordance with local regulations Three terminal ground rod resistance measurement DET3TC DET3TD DET4TD DET3TD DET3IC DET4TD Potential Current Potential Current Earth rotential Current spike spike spike spike electrode spike spike rod under test under test rod under test Figure 5 Connections for measuring three terminal ground rod resistance 1 With the selector switch in the OFF position connect the instrument as
23. ystems MV and HV rubber gloves and shoes not supplied with this instrument should be worn Special precautions are necessary when working in wet conditions or in agricultural areas observe the local safety standards and take all necessary special precautions applicable to the particular location m The instrument must be disconnected from the earthing system under test while batteries are being changed or the fuse replaced m Replacement batteries and fuses must be of the correct type and rating NOTE THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS Users of this equipment and or their employers are reminded that National Health and Safety Legislation requires 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 inadvertent short circuits Where the assessments show that the risk is significant then the use of fused test leads may be appropriate CAT II GAY II CAT IV Measurement category I Equipment Measurement category III Equipment connected Measurement category IV Equipment connected connected between the electrical outlets and the between the distribution panel and the electrical between the origin of the low voltage mains supply uset s equipment outlets and the distribution panel A LIVE EARTH SAFETY PRECAUTIONS It is preferable that the earth electrode to be tested is first isolated from the c
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