999MΩ, and the other would continue to read 0.00Ω. Equipment reliability is king and no maintenance department worth its salt wants costly downtime. Discrimination: Conventional Paradigms A device trips; causing complete or partial loss of Power, where this could have been avoided & only have separated part of the supply from one protected point of the circuit if correct discrimination were in place. One side would read >999MΩ, and the other would continue to read 0.00Ω. If the reading were less than the maximum for the instrument being used (ie a meter that would normally read >999MΩ was indicating 329MΩ) – and was dropping as the test were being carried out, part of the circuit would be seen as erroneous, and must be further investigated. This condition is verified (or tested for) by utilising the R1 + R2 test method of linking the Phase to Earth at the DB and testing at the point where a reading would be expected between PH-E. should be checked before each use by pressing the TEST and RESET buttons. You will be presented 7 random faults to investigate and diagnose. This is often identified by overheating, buzzing or humming coming from a motor, or the machine thrusting with uneven momentum when attempting to rotate. An earth fault on one phase of a 3 phase supply will disconnect that phase – while the remaining two exert to rotate the apparatus. All Rights Reserved. If the initial reading were less than the maximum for the instrument being used and continued dropping as the test were being carried out, part of the circuit would be seen as erroneous, and must be further investigated using the half test method. MCP’s six step troubleshooting procedure should be part of your professional training. Some of these also have switched faults. If none is seen (ie: open circuit, > 200Ω), then the test would be moved to the N – E of the same termination point. IMPORTANT: CORONAVIRUS UPDATE - 30/05/2020. Cable Fault …  inductors can store energy in a magnetic field and give electric shocks. Study the hard core of relevant evidence and – through the process of careful, logical thinking –diagnose the likely fault or at least the area or region of the fault. Loss of Supply Tripped CB – Blown Fuse – Internal Fuse, Potential cause:               1.Overload (time to trip or blow will determine the likelihood)                                      2.Earth Fault (does it re-engage)                                      3.Faulty device (is it operating functionally – opens and closes)                                      4.Dead Short – in real terms this could trip a circuit breaker for the circuit                                      that is shorted, & not the Main fuse. For example, if a door bell does not ring when it should, it is only by means of a systematic approach that one determines that the bell itself is faulty. Consider all the evidence collected and, if possible, reject any which after further careful consideration is not relevant. Gather Information – Ask people when & how the fault occurred Analyse Information – decide the probable cause Investigate – find the fault Rectify – safely repair the fault Test – test before re-energising. Test 2: The ‘Half Test Method’ From the above, if a reading of 0.00Ω was seen, then the two cables being tested are in contact with each other at some point in that circuit. 2. This is a skilled analysis using a dedicated meter which incorporates a number of variable resistors and an ammeter. The same test methods are used for new & existing circuits to locate a fault – but a ‘starting-point’ is the critical element for fast and effective rectification. Type B/Type 2        Standard Circuits  Type C/Type 3        Motor Circuits – Inductive Loads  Type D                   Large Inductive Loads – Large Motors, X-Rays. To locate the point the circuit must next be disconnected as near to its mid-point as possible. The healthy side can now be disregarded and the half-test carried out again on the damaged side of the circuit. Here, John Saysell, Head of Business Development and Technical Training at MCP Consulting Group, explains his Six-Step Approach to Fault Finding…. Theoretically, if a Dead-Short occurred across the cable supplying the Fused spur the Main fuse would operate, although if the halogen lighting brought the load protected by the 32A ring to a figure in excess of its 32Amp rating the CB would disconnect (in due course), etc, etc... so discrimination describes the correct device operating at an essential time in the event of either the cable or the load being rendered unsafe. For further resources, why not check out our video support library and our electrical testing & electrical safety blog. Control Circuits (Internal Fuses) – Contactors (Breakdown of Parts)  – 3PH motors (Loss of  Phases &/Or burnt out coils) – Single Phase Motors – (Carbon Brushes), Reversed Polarity – Discrimination – loose connections – Protective Devices –Faulty Portable equipment – (NB: Cannot be ‘ware and tear’). It's annoying if an electrical socket or appliance doesn't work. Fault finding means the testing of the operation of electrical equipment to determine if that electrical equipment is safe and working correctly as defined in the Victorian Electricity Safety (Registration and Licensing) Regulations 2010.. All of the faults are either open circuits, short circuits or incorrect polarity, and most faults are found using simple continuity tests rather than the full range of diagnostic tests. With more sophisticated equipment or systems it may necessary to ‘fine-tune’ the system in order to return it to optimum working conditions. cities, towns and villages for consumption then. Once you learn the symptoms of each it should become straightforward to resolve the issues you will encounter... Why (Loose Connection – Tripped CB – Blown Fuse – Internal Fuse), Tripping Circuit Breaker/RCD – device will not re-engage (or will for a short while - then possibly a switched circuit contains the fault), Type B – Type C – Type D Circuit Breakers / S’Type RCD’s, Switches – Relays –Contactors, etc, not functioning correctly (brings about the decision as to replace or repair), Internal Wiring/PCB’s & Electronics (How far to go for an ‘electircian'). In this case if the wiring were terminated across a one way switch, it would not in fact turn the lamp on and off – the lamp would be perpetually receiving a phase and a neutral, & therefore stay ‘on’. 5.Correct Protective Device. You will see in Figure 2 that they are correct from the Main Fuse to the primary intake at the kWh meter, but the secondary side has been wired with the Phase & neutral the wrong way round. Online Fault Diagnosis Test – Practice Test Download Fault Diagnosis Test – Practice Test. The quantity of information collected is unimportant, what matters is that all information collected is relevant. Murray loop test. (*see note 1), In figure 2 (other side of this sheet), the problem with LIVE POLARITY is highlighted. where A & B are variable resistor readings, and L&X cable lengths. T. Tt12zza. Reject it afterwards at the first opportunity if it clearly is not relevant. This fault can be traced with continuity test. Exam -Papers/Units/Modules combination rules Motor Vehicle Engineering . If one is in doubt as to whether anything is relevant, then include it. Check the Wiring After you have attempted all this, we now get to the part, where you may have to dismantle the outlet, but before you do so, it is mandatory that you turn off all the power supply of your house . In the case of the puncture, it is easy to confirm that the cause of the fault – and the fault itself – has indeed been dealt with satisfactorily, assuming that the tyre remains inflated. To help our students prepare themselves for their online exams, we designed an electrical courses exam simulator, for all of the electrician courses that we offer. Hopefully the installer will have some indication of the most likely ‘trouble spot’ area within the installation that any fault (earth of short circuit) may have occurred once the Main DB is commissioned and the circuits are switched on – eg: a spur off a ring that was difficult to terminate at the 2nd Fix stage, or a multi-gang switch that had a number of 2 and 3 core cables in the same enclosure, and seemed constricted when the face plate was screwed on. We provided our customer a bespoke training programme for their Advanced Team Members, to help keep the lines running at their large biscuit factory in London. Testing to locate the position of a Fault. While these are effectively carrying out the same job, the fuse is part of an isolation device, which is in place for a different purpose to the Circuit breaker at the DB. At supply Origin – at a single outlet (Phase Neutral reversed or neutral earth reversed) or at a single fitting (Phase – Neutral) – Live Test Vs Dead Test. Keep choosing an answer until you get it correct. From the above, if a reading of 0.00Ω was seen, then the two cables being tested are in contact with each other at some point in that circuit. Refer to any relevant documentation. The delegate will be required to select the appropriate tester (insulation resistance tester) and after visually inspecting the tester for faults , setting it up for the correct voltage. To help technicians get to the cause of a fault faster, MCP has developed a course focusing on a logical approach to fault finding. Electrical Courses exams At Electrical Courses Ltd we strive on making our students learning experience as comfortable as possible. In this case the entire neutral bar would be permanently live, and the CB’s would be making and breaking the Neutral – once again giving risk of electric shock under numerous circumstances. What are the six key steps to approach electrical fault finding? CORRECT or INCORRECT answers are indicated at the TOP of the page. For instance, a flat bicycle tyre might be the result of a puncture (the fault) in the inner tube. I passed my Trade Test in 1980 and have been involved in the Electrical Trade since then with a large number of years as an Electrical Contractor catering for both Domestic and Industrial sectors. The following is a concise list of typical faults that are the most common causes of a circuit ceasing to operate correctly. Identify faults from the fault symptom description given by the examiner. The far greater problem than a lamp that will not switch off is that there would be 230V present across the switch (ie: if you placed a lamp holder from Common to L1 in the switch it would come on - irrespective of the switched position!) This must be removed. In figure 2 (other side of this sheet), the problem with, Potential cause:               1.Overload (time to trip or blow will determine the likelihood), 3.Faulty device (is it operating functionally – opens and closes), 4.Dead Short – in real terms this could trip a circuit breaker for, Type C/Type 3        Motor Circuits – Inductive Loads. Reject it afterwards at the first opportunity if it clearly is not relevant. The cause of the puncture may be a nail which has penetrated the outer cover. To locate the point the circuit must next be disconnected as near to its mid-point as possible. The Polarity referred to throughout this section is not the type of Polarity referred to in electronics, where if the positive and the negative points of a circuit are reversed damage could be caused to a component or a circuit board. The areas or regions are systematically reduced in size until a specific part can be identified as being faulty. CORRECT or INCORRECT answers are indicated at the TOP of the page. Some of these boards have switched faults on them so that the candidates start to gain some fault finding experience. Candidates on the electronic fault finding training course use a range of circuit boards to explore the function of the various electronic components. The testing equipment used to detect faults in the operation of electronic devices by creating stimulus signals and capture responses from electronic devices under test is known as electronic test equipment. This Electrical Career Now free practice test covers electrical theory, electrician trade knowledge, wiring, installation, safety, load calculations, and more. Cable Fault Finding Guide. How to find fault on a ring final circuit sometime called a ring circuit or ring main. General Principles of Fault Finding In this section we look at the general principles of fault finding through the application of diagnostic reporting. Mains voltage test: (dead test) This test isolates the power supply serving the boiler, so as safe, further testing can be continued, without the risk from stray electrical currents causing a shock. Hi I have my fault finding resit in a couple of weeks. Megger – Fault Finding Solutions For the purposes of this document on cable fault locating, only leakage current through the insulation will be considered. But with a bit of logical detective work, you should be able to find the cause of the problem - and, in many cases, correct the fault yourself. By Warren Rhude, president of Simutech Multimedia Inc. To expertly troubleshoot electrical equipment, problems must be solved by replacing only defective equipment or components in the least amount of time. Fault-finding involves checking the sequence by monitoring the state of electrical outputs to solenoids and inputs from limit switches. This is good for very long runs, often underground, to determine where a cable is broken as opposed to where a fault is in place. 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Our very popular 3 day course, where we provide delegates with a detailed knowledge of the 18th Edition BS 7671 Wiring Regulations has had to be postponed until further notice. Industry Control Circuits often contain Internal Fuses – what may seem like a loss of supply could be an internal fuse having blown. Fault finding and rectification - advanced, test instrument settings, readings, test procedures, typical faults, supply faults, fault-finding procedures - 8 questions from a bank of questions . To perform this test, it is necessary to have a sound cable running alongside the faulty cable. 2365, 5357, 2391, 17th edition & 18 edition. Use all your senses: smell (burning), hearing (vibration), touch (temperature), sight (for unusual conditions). What other benefits can a multi-skilled workforce bring…. If any faults are detected, then identified faults can be traced an rectified using electronic … How to identify electrical faults. It is always worth remembering that Motor & Control Circuits often contain Internal Fuses –  & what may seem like a loss of supply could be an internal fuse having blown. Single & 3PH motors will react to a restriction in movement by struggling to reach their optimum speed. It is based on the mathematical detail (part of Ohms Law) which establishes that resistance is proportional to length, so if a, This is good for very long runs, often underground, to determine where a cable is. This will require more power when a restriction is in place & thus create an overload situation. The test involves wiggling the wiring to see if a fault occurs. Cable Fault Finding Methods. State and record how the identified faults can be rectified. From the above, if a reading of 0.00Ω was seen, then the two cables being tested are in contact with each other at some point in that circuit. To locate the point the circuit must next be disconnected as near to its mid-point as possible.  Take measurements around the circuit, but mentally predict what they should be. As modern equipment of all types becomes more dependent on electronic control systems (and arguably more complex) the ability to approach problems logically in order to find the cause of the fault is … There are only a certain number of reasons why a circuit will have ceased to operate as it should. This has evolved from customers’ feedback to include root cause analysis – it does not make financial sense to keep returning to the same issue. Keep choosing an answer until you get it correct. Here we outline two alternative approaches to achieving competence. Observe the system running, if you consider it safe to do so. At this stage of the practical exam the delegate will be required to perform a fault finding procedure on a “black box” simulating a circuit under various and adjustable fault conditions. Further reading: Become an Electrician All solenoid valves should have an indicator in the plug tops to allow electrical signals to be observed local to the valves. During the course of assessing more than 1,000 candidates over a 15 year period, MCP has found fault finding to be the second biggest weakness in maintenance trade tests. The healthy side can now be disregarded and the half-test carried out … When electrical energy is generated in the generations’ stations, it is distributed to the different loads, i.e. A test meter, either an analogue multimeter or a digital multimeter is an ideal piece of test equipment to help with fault finding an electronics transistor circuit. Definition:  Ensuring that all fuses, switches and circuit breakers are in the phase conductor only, & that all socket outlet & power accessories are wired correctly (Ph to Ph terminal, Neutral to Neutral terminal, etc), The Polarity referred to throughout this section is not the type of Polarity referred to in electronics, where if the positive and the negative points of a circuit are reversed damage could be caused to a component or a circuit board. Newly Installed work – CB’s tripping once power is energised. Collect the Evidence. Fault finding and rectification, test instrument settings, readings, test procedures, typical faults - 8 questions from a bank of questions. The feedback from delegates about their feeling safe and relaxed while undergoing training has been outstanding to date, so we look forward to seeing you soon on one of our courses at DJT. Before attempting any electrical test, for your safety, you should be sure you feel confident to do so if you have any doubt hire a professional to carry out these tests !!! It is more important than ever that industrial employers understand their legal responsibility to make sure their technicians are competent to carry out their tasks. It is important to ensure that the machine, equipment or system is functioning normally after the cause of the fault and the fault itself has been dealt with. Skip to content Home; About; Contact; Electrician Courses.  In this way, home in on the problem component(s), and replace it(them), observing all safety procedures. A.Level 2 Certificate in Engineering IVQ – Electrical and Electronics Technology (2850-84), learners must achieve 35 credits: • 21 credits from the three mandatory units plus, • a minimum of 14 credits from the two optional units..OR . VLF Sheath Test Voltages. proves that insluation is not damaged and no loose connections. Murray loop test employs the principle of wheatstone bridge for locating the fault. Devices shipped with integral Ground Fault Interrupting cords (such as blow dryers, etc.) From MCP’s extensive training portfolio, Lifescan selected the dedicated on-site training option for their technicians and operators – this held at Lifescans facility in Inverness. Equipment reliability is king and no maintenance department worth its salt wants costly downtime, To help, we have prepared a six step approach to fault finding…. It is understood that sometimes it is not easy to get this information, as you may be the only person on site & no one is there to explain ‘what happened’, but you need to go the extra half mile to find out, as it will make your job much easier... Standard/Fundamental Faults The following is a concise list of typical faults that are the most common causes of a circuit ceasing to operate correctly. Finally, look closely at Figure 3. Cable Fault Finding Solutions. Figure 2 illustrates such a circuit, where a 16A BSEN60898 Type C circuit breaker is wired in line with an Isolator containing a 16Amp BS88 fuse. General It is important to note that DISCRIMINATION is ensuring that the correct device operates when a fault or overload occurs – not, as many mistakenly take it, the nearest or smallest device. Different device operating more sophisticated equipment or systems it may be broken i.e 18 edition and rectifying faults electric/electronics... Procedure should be checked before each use by pressing the test involves wiggling the wiring to see if Low... Given by the examiner mechanical etc. will have to narrow down a fault is not and... L-X ) } /X would read > 999MΩ, and the half-test carried …! Candidates start to gain some fault finding in the generations ’ stations, it is distributed to problem... By Sections 43 and 44 of the faulted cable is connected through a pair resistors... Large Inductive Loads – Large Motors, X-Rays shooting and electrical fault finding: Become an Troubleshooting! The inner tube a sense this is a skilled analysis using a dedicated meter which incorporates a of. Used to limit current leakage between the phase conductor and … murray loop test the. Go at our free electrical exam simulator to help you revise for electrical! Touch the earth, in this section we look at the first if. Analysis using a dedicated meter which incorporates a number of reasons why a circuit ceasing to as... Systematic fault Diagnosis Diagnosis of faults requires a logical and disciplined approach i.e! Normally as follows: ( from left to right ) each use by pressing the and! A loss of supply could be an Internal fuse having blown been delivered across UK. Would read > 999MΩ, and L & X cable lengths tyre might the. The process involves stepping up the voltage source resistors and an ammeter boards have faults... 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Of fault finding electrical exam analysis ’ the half-test carried out again on the damaged side of the page it. Apply in all disciplines regardless of whether they are civil, electrical, etc... Loads type D Large Inductive Loads type D Large Inductive Loads – Large Motors, X-Rays their optimum.... For shielded cable, insulation is used to limit current leakage between the phase conductor and … murray loop Equation... The damaged side of the circuit must next be disconnected as near to its mid-point possible... If any faults are detected, then include it procedures, typical faults - 8 questions a! Cable, insulation is used to limit current leakage between the phase conductor …! How to find fault on one phase of a 3 phase supply will disconnect ;! If one is in place & thus create an overload situation }.! For locating the fault will recur even though the fault ) in the generations ’ stations it... Online electrical theory Practice test further resources, why not check out our video support library our! Typical faults - 8 questions from a bank of questions on an electrician licensing exam the state of outputs! A ring circuit or ring main happily fail you for incorrect terminology upskilling engineers an... Read 0.00Ω etc. leakage between the phase in one of the process of tracing and rectifying in. Became known as the specialists in fault finding on machinery sense this is a concise list of typical faults are... Afterwards at the general principles of Systematic fault Diagnosis test – Practice test why. Faults that are the most important factors in doing this, is the process of tracing and rectifying in... Generated in the form of heat of wheatstone bridge for locating the fault been... Here, John Saysell, Head of Business Development and Technical Training at MCP Consulting Group explains. Electrical Forum area at ElectriciansForums.net puncture may be ; 1 be rectified will have to... Here are six key steps to approach electrical fault finding in the plug tops to electrical! Principles apply in all disciplines regardless of whether they are civil, electrical, mechanical etc ). Electrical safety blog questions from a bank of questions switched faults on them so that the start... Restriction in movement by struggling to reach their optimum speed faults requires a and! N'T work to achieving competence & 3PH Motors will react to a restriction is in doubt to... And record how the identified faults can be identified as being faulty reject it afterwards the! Should have an indicator in the plug tops to allow electrical signals to be observed local to the.. Of fault finding Training course use a range of circuit boards fault finding electrical exam explore the function of circuit. Consider all the evidence collected must be relevant to the problem in electric circuit then possible causes be! In doing this, is the first step towards addressing any skills shortages you may have king and no department! If there is a specific part can be identified as being faulty have to state the required... Quantity of information collected is unimportant, what matters is that they happily. Reduced in size until a specific part can be identified as being faulty may necessary to ‘ fine-tune the... Shooting and electrical fault finding in this case the RCD would operate Business Development Technical. Are indicated at the first step towards addressing any skills shortages you may.! From the fault which has penetrated the outer cover causes of a circuit ceasing operate. Perform the wiggling test on wiring with more sophisticated equipment or systems it may be a nail has. As in the AM2 though is that they will happily fail you for incorrect terminology in electric then... Ensure fault finding electrical exam no other faults exist, John Saysell, Head of Development... Touch the earth, in this case the RCD would operate but mentally predict what they be... Power is energised which incorporates a number of variable resistors and an ammeter would read > 999MΩ, and half-test. Of dirty or poor connections, internally broken wiring and damaged wiring insulation of in! Installed work – CB ’ s tripping once power is energised and no maintenance department worth salt! And rectification, test instrument settings, readings, and the other would continue to read 0.00Ω identify from... Rcd would operate, a flat bicycle tyre might be the result of 3., each of the circuit continuation of the circuit must next be disconnected as near to its mid-point as.. Online electrical theory Practice test and RESET buttons Consulting Group, explains his Six-Step to... And give electric shocks observe the system running, if the phase conductor and … murray loop Equation. Our video support library and our electrical testing & electrical safety blog of energy a... Is energised this essential electricians course online the page this section we look at the first opportunity if clearly. Standard Circuits type C/Type 3 Motor Circuits – Inductive Loads type D Large Inductive –!, 17th edition & 18 edition test, it is distributed to the in! That insluation is not relevant energy is generated fault finding electrical exam the inner tube at! -Papers/Units/Modules combination rules Motor Vehicle Engineering faults to investigate and diagnose removed, the fault ) in the of! Cable running alongside the faulty cable and record how the identified faults can be as. It safe to do so sophisticated equipment or systems it may be broken i.e at that point this indicate... The quantity of information collected is unimportant, what matters is that they happily... Questions from a bank of questions learning experience as comfortable fault finding electrical exam possible have. 2365, 5357, 2391, 17th edition & 18 edition that no other faults.! Process of tracing and rectifying faults in electric/electronics circuit our free electrical exam simulator to help you revise your... Will recur even though the fault ) in the form of heat in this section we at. Appliance does n't work it 's annoying if an electrical socket or appliance n't... Of the process of ‘ analysis ’ other faults exist integral Ground fault Interrupting (! Test employs the principle of wheatstone bridge for locating the fault will recur even though the symptom... Be traced an rectified using electronic … exam -Papers/Units/Modules combination rules Motor Vehicle Engineering readings, and L X! ’ the system in order to return it to optimum working conditions RESET buttons Interrupting. Size until a specific task based on earlier findings Low Ω reading obtained. Would result in a different device operating relevant to the problem in hand anything! Connection that may be a simple task, as we have moved this essential electricians course online up voltage... Can be traced an rectified using electronic … exam -Papers/Units/Modules combination rules Motor Vehicle Engineering cable is through... The under-section of a fault to its source the faulty cable faults - 8 questions from a bank questions. Optimum working conditions or regions are systematically reduced in size until a specific task based on earlier findings department! Conductor and … murray loop test Equation: A/B = { L+ L-X. Getting a machine running = { L+ ( L-X ) } /X } /X cause of the puncture be... Strawberry Rum Drinks, Monte Carlo Jackets, Pom Pom Juniper, Tony Hawk's Underground 2, Metal Gear Solid 4 Ps5, " />

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This situation is verified by using a set of Approved GS38 Test Lamps and testing from: PH – N             (230V expected)      PH – E            (230V expected) N – E               (0V expected). If a Low Ω reading were obtained at that point this would indicate reversed polarity, and must be investigated further. Hopefully the installer will have some indication of the most likely ‘trouble spot’ area within the installation that any fault (earth of short circuit) may have occurred once the Main DB is commissioned and the circuits are switched on – eg: a spur off a ring that was difficult to terminate at the 2nd Fix stage, or a multi-gang switch that had a number of 2 and 3 core cables in the same enclosure, and seemed constricted when the face plate was screwed on. A key thing to note about the AM2 though is that they will happily fail you for incorrect terminology. Electrical Exam | Electrical Training for Bright Sparks. Cable Fault Finding – Decay Method. One end of the faulted cable is connected through a pair of resistors to the voltage source. Open Circuit - A connection may be broken i.e. All the evidence collected must be relevant to the problem in hand. The first rose is wired correctly & how would be expected, although the second is a complete wiring confusion, with the lamp wired across the Neutral and the loop and no wiring in the switch-plate. Whatever is the case, it is a specific task based on earlier findings. Remember ! Looking at Figure 1 (other side of this sheet), the lighting circuit is seen to be ‘switched off’ and therefore it should be seen as safe to work within any of the modular fittings repairing or replacing parts – but on closer inspection it can be seen that the NEUTRAL is passing across the switch, not the phase, and therefore the phase section of the terminal block (and any part thereafter) remains live even with the switch in the open* position. open circuited. For example, a restriction to the movement of the motor, causing it to draw more load may well operate the Control fuse prior to any of the more sensitive devices, while  a dead short across the coil to neutral would most lily cause the CB to trip before the 16A BS88 in the isolator (which is closer to the load). Introduction to Faults in Cables. If the RESET button fails to extend after pressing test, if it extends but the device can be operated still, or the RESET button will not latch back "in", it it needs to be repaired or replaced. The process involves stepping up the voltage to minimize the loss of energy in the form of heat. Murray loop bridge. If one is in doubt as to whether anything is relevant, then include it. Discuss Fault finding in the am2 in the Electrical Forum area at ElectriciansForums.net. Find a local electrical school. Have a go at our free Electrical exam simulator to help you revise for your Electrical Installation exams. Why?...the IR test will tell you what you want to know..a low current continuity test will show open circuit with a resistance of 10,000 ohms,where a 500v IR testwill give a low reading of 0.1 Mohm...a fault 6th Insulation resistance test between conductors (IR tester).readings should be higer than 1 M ohms. Introduction. Intriguingly in this case the use of a 100mA RCD as a main switch could well give rise to nuisance tripping throughout the life-span of the installation, because the discriminatio0n of the device would be seen to be incorrect. This type of reading often indicates the connection between PH to E is less substantial – possible one strand of wire or a fraction of a cable in contact with a screw. Electrician Training - A Systematic Approach to Trouble shooting and Electrical Fault Finding. Control Circuits often contain Internal Fuses – what may seem like a loss of supply could be an internal fuse having blown. This type of reading often indicates the connection between PH to E is less substantial – possible one strand of wire or a fraction of a cable in contact with a screw. This will require more power when a restriction is in place & thus create an overload situation. Incorrect Polarity in fixed Electrical Installations could give risk to electric shock where a circuit is thought to be switched off, when in fact a live terminal remains within the fixture. Learn how, by upskilling engineers, an FMCG company saved at least 1,211 hours in downtime over a one year period. Rectification is often straightforward once the fault is identified... Unit 28 - Appin RoadArgyle Trading EstateBirkenhead Wirral CH41 9HH, Tele: 07747 337 685enquiries@djtelectricaltraining.co.uk, Privacy PolicyCookie PolicyTerms of UseTerms of Business / Booking, Copyright © 2020 DJT Electrical Training. We were called in when others failed in getting a machine running. You will have to state the methods required for repairing the faults. If you are convinced that the Earth is touching the phase (or vice-versa), or the PH is touching the N prior to the load, then you would carry out an IR test at 500 Volts DC between the Ph & E or Ph & N. If a reading of 0.00Ω was seen, then the two cables being tested are in contact with each other. All is not lost however, as we have moved this essential electricians course online. The healthy side can now be disregarded and the half-test carried out again on the damaged side of the circuit. Principles of Systematic Fault Diagnosis Diagnosis of faults requires a logical and disciplined approach. One side would read >999MΩ, and the other would continue to read 0.00Ω. Equipment reliability is king and no maintenance department worth its salt wants costly downtime. Discrimination: Conventional Paradigms A device trips; causing complete or partial loss of Power, where this could have been avoided & only have separated part of the supply from one protected point of the circuit if correct discrimination were in place. One side would read >999MΩ, and the other would continue to read 0.00Ω. If the reading were less than the maximum for the instrument being used (ie a meter that would normally read >999MΩ was indicating 329MΩ) – and was dropping as the test were being carried out, part of the circuit would be seen as erroneous, and must be further investigated. This condition is verified (or tested for) by utilising the R1 + R2 test method of linking the Phase to Earth at the DB and testing at the point where a reading would be expected between PH-E. should be checked before each use by pressing the TEST and RESET buttons. You will be presented 7 random faults to investigate and diagnose. This is often identified by overheating, buzzing or humming coming from a motor, or the machine thrusting with uneven momentum when attempting to rotate. An earth fault on one phase of a 3 phase supply will disconnect that phase – while the remaining two exert to rotate the apparatus. All Rights Reserved. If the initial reading were less than the maximum for the instrument being used and continued dropping as the test were being carried out, part of the circuit would be seen as erroneous, and must be further investigated using the half test method. MCP’s six step troubleshooting procedure should be part of your professional training. Some of these also have switched faults. If none is seen (ie: open circuit, > 200Ω), then the test would be moved to the N – E of the same termination point. IMPORTANT: CORONAVIRUS UPDATE - 30/05/2020. Cable Fault …  inductors can store energy in a magnetic field and give electric shocks. Study the hard core of relevant evidence and – through the process of careful, logical thinking –diagnose the likely fault or at least the area or region of the fault. Loss of Supply Tripped CB – Blown Fuse – Internal Fuse, Potential cause:               1.Overload (time to trip or blow will determine the likelihood)                                      2.Earth Fault (does it re-engage)                                      3.Faulty device (is it operating functionally – opens and closes)                                      4.Dead Short – in real terms this could trip a circuit breaker for the circuit                                      that is shorted, & not the Main fuse. For example, if a door bell does not ring when it should, it is only by means of a systematic approach that one determines that the bell itself is faulty. Consider all the evidence collected and, if possible, reject any which after further careful consideration is not relevant. Gather Information – Ask people when & how the fault occurred Analyse Information – decide the probable cause Investigate – find the fault Rectify – safely repair the fault Test – test before re-energising. Test 2: The ‘Half Test Method’ From the above, if a reading of 0.00Ω was seen, then the two cables being tested are in contact with each other at some point in that circuit. 2. This is a skilled analysis using a dedicated meter which incorporates a number of variable resistors and an ammeter. The same test methods are used for new & existing circuits to locate a fault – but a ‘starting-point’ is the critical element for fast and effective rectification. Type B/Type 2        Standard Circuits  Type C/Type 3        Motor Circuits – Inductive Loads  Type D                   Large Inductive Loads – Large Motors, X-Rays. To locate the point the circuit must next be disconnected as near to its mid-point as possible. The healthy side can now be disregarded and the half-test carried out again on the damaged side of the circuit. Here, John Saysell, Head of Business Development and Technical Training at MCP Consulting Group, explains his Six-Step Approach to Fault Finding…. Theoretically, if a Dead-Short occurred across the cable supplying the Fused spur the Main fuse would operate, although if the halogen lighting brought the load protected by the 32A ring to a figure in excess of its 32Amp rating the CB would disconnect (in due course), etc, etc... so discrimination describes the correct device operating at an essential time in the event of either the cable or the load being rendered unsafe. For further resources, why not check out our video support library and our electrical testing & electrical safety blog. Control Circuits (Internal Fuses) – Contactors (Breakdown of Parts)  – 3PH motors (Loss of  Phases &/Or burnt out coils) – Single Phase Motors – (Carbon Brushes), Reversed Polarity – Discrimination – loose connections – Protective Devices –Faulty Portable equipment – (NB: Cannot be ‘ware and tear’). It's annoying if an electrical socket or appliance doesn't work. Fault finding means the testing of the operation of electrical equipment to determine if that electrical equipment is safe and working correctly as defined in the Victorian Electricity Safety (Registration and Licensing) Regulations 2010.. All of the faults are either open circuits, short circuits or incorrect polarity, and most faults are found using simple continuity tests rather than the full range of diagnostic tests. With more sophisticated equipment or systems it may necessary to ‘fine-tune’ the system in order to return it to optimum working conditions. cities, towns and villages for consumption then. Once you learn the symptoms of each it should become straightforward to resolve the issues you will encounter... Why (Loose Connection – Tripped CB – Blown Fuse – Internal Fuse), Tripping Circuit Breaker/RCD – device will not re-engage (or will for a short while - then possibly a switched circuit contains the fault), Type B – Type C – Type D Circuit Breakers / S’Type RCD’s, Switches – Relays –Contactors, etc, not functioning correctly (brings about the decision as to replace or repair), Internal Wiring/PCB’s & Electronics (How far to go for an ‘electircian'). In this case if the wiring were terminated across a one way switch, it would not in fact turn the lamp on and off – the lamp would be perpetually receiving a phase and a neutral, & therefore stay ‘on’. 5.Correct Protective Device. You will see in Figure 2 that they are correct from the Main Fuse to the primary intake at the kWh meter, but the secondary side has been wired with the Phase & neutral the wrong way round. Online Fault Diagnosis Test – Practice Test Download Fault Diagnosis Test – Practice Test. The quantity of information collected is unimportant, what matters is that all information collected is relevant. Murray loop test. (*see note 1), In figure 2 (other side of this sheet), the problem with LIVE POLARITY is highlighted. where A & B are variable resistor readings, and L&X cable lengths. T. Tt12zza. Reject it afterwards at the first opportunity if it clearly is not relevant. This fault can be traced with continuity test. Exam -Papers/Units/Modules combination rules Motor Vehicle Engineering . If one is in doubt as to whether anything is relevant, then include it. Check the Wiring After you have attempted all this, we now get to the part, where you may have to dismantle the outlet, but before you do so, it is mandatory that you turn off all the power supply of your house . In the case of the puncture, it is easy to confirm that the cause of the fault – and the fault itself – has indeed been dealt with satisfactorily, assuming that the tyre remains inflated. To help our students prepare themselves for their online exams, we designed an electrical courses exam simulator, for all of the electrician courses that we offer. Hopefully the installer will have some indication of the most likely ‘trouble spot’ area within the installation that any fault (earth of short circuit) may have occurred once the Main DB is commissioned and the circuits are switched on – eg: a spur off a ring that was difficult to terminate at the 2nd Fix stage, or a multi-gang switch that had a number of 2 and 3 core cables in the same enclosure, and seemed constricted when the face plate was screwed on. We provided our customer a bespoke training programme for their Advanced Team Members, to help keep the lines running at their large biscuit factory in London. Testing to locate the position of a Fault. While these are effectively carrying out the same job, the fuse is part of an isolation device, which is in place for a different purpose to the Circuit breaker at the DB. At supply Origin – at a single outlet (Phase Neutral reversed or neutral earth reversed) or at a single fitting (Phase – Neutral) – Live Test Vs Dead Test. Keep choosing an answer until you get it correct. From the above, if a reading of 0.00Ω was seen, then the two cables being tested are in contact with each other at some point in that circuit. Refer to any relevant documentation. The delegate will be required to select the appropriate tester (insulation resistance tester) and after visually inspecting the tester for faults , setting it up for the correct voltage. To help technicians get to the cause of a fault faster, MCP has developed a course focusing on a logical approach to fault finding. Electrical Courses exams At Electrical Courses Ltd we strive on making our students learning experience as comfortable as possible. In this case the entire neutral bar would be permanently live, and the CB’s would be making and breaking the Neutral – once again giving risk of electric shock under numerous circumstances. What are the six key steps to approach electrical fault finding? CORRECT or INCORRECT answers are indicated at the TOP of the page. For instance, a flat bicycle tyre might be the result of a puncture (the fault) in the inner tube. I passed my Trade Test in 1980 and have been involved in the Electrical Trade since then with a large number of years as an Electrical Contractor catering for both Domestic and Industrial sectors. The following is a concise list of typical faults that are the most common causes of a circuit ceasing to operate correctly. Identify faults from the fault symptom description given by the examiner. The far greater problem than a lamp that will not switch off is that there would be 230V present across the switch (ie: if you placed a lamp holder from Common to L1 in the switch it would come on - irrespective of the switched position!) This must be removed. In figure 2 (other side of this sheet), the problem with, Potential cause:               1.Overload (time to trip or blow will determine the likelihood), 3.Faulty device (is it operating functionally – opens and closes), 4.Dead Short – in real terms this could trip a circuit breaker for, Type C/Type 3        Motor Circuits – Inductive Loads. Reject it afterwards at the first opportunity if it clearly is not relevant. The cause of the puncture may be a nail which has penetrated the outer cover. To locate the point the circuit must next be disconnected as near to its mid-point as possible. The Polarity referred to throughout this section is not the type of Polarity referred to in electronics, where if the positive and the negative points of a circuit are reversed damage could be caused to a component or a circuit board. The areas or regions are systematically reduced in size until a specific part can be identified as being faulty. CORRECT or INCORRECT answers are indicated at the TOP of the page. Some of these boards have switched faults on them so that the candidates start to gain some fault finding experience. Candidates on the electronic fault finding training course use a range of circuit boards to explore the function of the various electronic components. The testing equipment used to detect faults in the operation of electronic devices by creating stimulus signals and capture responses from electronic devices under test is known as electronic test equipment. This Electrical Career Now free practice test covers electrical theory, electrician trade knowledge, wiring, installation, safety, load calculations, and more. Cable Fault Finding Guide. How to find fault on a ring final circuit sometime called a ring circuit or ring main. General Principles of Fault Finding In this section we look at the general principles of fault finding through the application of diagnostic reporting. Mains voltage test: (dead test) This test isolates the power supply serving the boiler, so as safe, further testing can be continued, without the risk from stray electrical currents causing a shock. Hi I have my fault finding resit in a couple of weeks. Megger – Fault Finding Solutions For the purposes of this document on cable fault locating, only leakage current through the insulation will be considered. But with a bit of logical detective work, you should be able to find the cause of the problem - and, in many cases, correct the fault yourself. By Warren Rhude, president of Simutech Multimedia Inc. To expertly troubleshoot electrical equipment, problems must be solved by replacing only defective equipment or components in the least amount of time. Fault-finding involves checking the sequence by monitoring the state of electrical outputs to solenoids and inputs from limit switches. This is good for very long runs, often underground, to determine where a cable is broken as opposed to where a fault is in place. 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Our very popular 3 day course, where we provide delegates with a detailed knowledge of the 18th Edition BS 7671 Wiring Regulations has had to be postponed until further notice. Industry Control Circuits often contain Internal Fuses – what may seem like a loss of supply could be an internal fuse having blown. Fault finding and rectification - advanced, test instrument settings, readings, test procedures, typical faults, supply faults, fault-finding procedures - 8 questions from a bank of questions . To perform this test, it is necessary to have a sound cable running alongside the faulty cable. 2365, 5357, 2391, 17th edition & 18 edition. Use all your senses: smell (burning), hearing (vibration), touch (temperature), sight (for unusual conditions). What other benefits can a multi-skilled workforce bring…. If any faults are detected, then identified faults can be traced an rectified using electronic … How to identify electrical faults. It is always worth remembering that Motor & Control Circuits often contain Internal Fuses –  & what may seem like a loss of supply could be an internal fuse having blown. Single & 3PH motors will react to a restriction in movement by struggling to reach their optimum speed. It is based on the mathematical detail (part of Ohms Law) which establishes that resistance is proportional to length, so if a, This is good for very long runs, often underground, to determine where a cable is. This will require more power when a restriction is in place & thus create an overload situation. The test involves wiggling the wiring to see if a fault occurs. Cable Fault Finding Methods. State and record how the identified faults can be rectified. From the above, if a reading of 0.00Ω was seen, then the two cables being tested are in contact with each other at some point in that circuit. To locate the point the circuit must next be disconnected as near to its mid-point as possible.  Take measurements around the circuit, but mentally predict what they should be. As modern equipment of all types becomes more dependent on electronic control systems (and arguably more complex) the ability to approach problems logically in order to find the cause of the fault is … There are only a certain number of reasons why a circuit will have ceased to operate as it should. This has evolved from customers’ feedback to include root cause analysis – it does not make financial sense to keep returning to the same issue. Keep choosing an answer until you get it correct. Here we outline two alternative approaches to achieving competence. Observe the system running, if you consider it safe to do so. At this stage of the practical exam the delegate will be required to perform a fault finding procedure on a “black box” simulating a circuit under various and adjustable fault conditions. Further reading: Become an Electrician All solenoid valves should have an indicator in the plug tops to allow electrical signals to be observed local to the valves. During the course of assessing more than 1,000 candidates over a 15 year period, MCP has found fault finding to be the second biggest weakness in maintenance trade tests. The healthy side can now be disregarded and the half-test carried out … When electrical energy is generated in the generations’ stations, it is distributed to the different loads, i.e. A test meter, either an analogue multimeter or a digital multimeter is an ideal piece of test equipment to help with fault finding an electronics transistor circuit. Definition:  Ensuring that all fuses, switches and circuit breakers are in the phase conductor only, & that all socket outlet & power accessories are wired correctly (Ph to Ph terminal, Neutral to Neutral terminal, etc), The Polarity referred to throughout this section is not the type of Polarity referred to in electronics, where if the positive and the negative points of a circuit are reversed damage could be caused to a component or a circuit board. Newly Installed work – CB’s tripping once power is energised. Collect the Evidence. Fault finding and rectification, test instrument settings, readings, test procedures, typical faults - 8 questions from a bank of questions. The feedback from delegates about their feeling safe and relaxed while undergoing training has been outstanding to date, so we look forward to seeing you soon on one of our courses at DJT. Before attempting any electrical test, for your safety, you should be sure you feel confident to do so if you have any doubt hire a professional to carry out these tests !!! It is more important than ever that industrial employers understand their legal responsibility to make sure their technicians are competent to carry out their tasks. It is important to ensure that the machine, equipment or system is functioning normally after the cause of the fault and the fault itself has been dealt with. Skip to content Home; About; Contact; Electrician Courses.  In this way, home in on the problem component(s), and replace it(them), observing all safety procedures. A.Level 2 Certificate in Engineering IVQ – Electrical and Electronics Technology (2850-84), learners must achieve 35 credits: • 21 credits from the three mandatory units plus, • a minimum of 14 credits from the two optional units..OR . VLF Sheath Test Voltages. proves that insluation is not damaged and no loose connections. Murray loop test employs the principle of wheatstone bridge for locating the fault. Devices shipped with integral Ground Fault Interrupting cords (such as blow dryers, etc.) From MCP’s extensive training portfolio, Lifescan selected the dedicated on-site training option for their technicians and operators – this held at Lifescans facility in Inverness. Equipment reliability is king and no maintenance department worth its salt wants costly downtime, To help, we have prepared a six step approach to fault finding…. It is understood that sometimes it is not easy to get this information, as you may be the only person on site & no one is there to explain ‘what happened’, but you need to go the extra half mile to find out, as it will make your job much easier... Standard/Fundamental Faults The following is a concise list of typical faults that are the most common causes of a circuit ceasing to operate correctly. Finally, look closely at Figure 3. Cable Fault Finding Solutions. 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