fault finding electrical exam

For intermittent faults, perform the wiggling test on wiring. Introduction to Faults in Cables. 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. To locate the point the circuit must next be disconnected as near to its mid-point as possible. All solenoid valves should have an indicator in the plug tops to allow electrical signals to be observed local to the valves. 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). Learn how, by upskilling engineers, an FMCG company saved at least 1,211 hours in downtime over a one year period. 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. The following is a concise list of typical faults that are the most common causes of a circuit ceasing to operate correctly. Whether they’re working on tanks in the armed forces or repairing a city bridge, technicians, civil engineers, and security personnel need to know how to spot and quickly fix equipment. If there is a problem in electric circuit then possible causes may be; 1. All the evidence collected must be relevant to the problem in hand. In a sense this is a continuation of the process of ‘analysis’. Industry Control Circuits often contain Internal Fuses – what may seem like a loss of supply could be an internal fuse having blown. 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. Cable Fault … Reversed Polarity 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. 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. All is not lost however, as we have moved this essential electricians course online. 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 . One of the most important factors in doing this, is the approach used. The healthy side can now be disregarded and the half-test carried out again on the damaged side of the circuit. 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. One side would read >999MΩ, and the other would continue to read 0.00Ω. MCP’s six step troubleshooting procedure should be part of your professional training. Electrician Training - A Systematic Approach to Trouble shooting and Electrical Fault Finding. 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. Refer to any relevant documentation. 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. Industry 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. This will require more power when a restriction is in place & thus create an overload situation. When electrical energy is generated in the generations’ stations, it is distributed to the different loads, i.e. One side would read >999MΩ, and the other would continue to read 0.00Ω. This is a skilled analysis using a dedicated meter which incorporates a number of variable resistors and an ammeter. 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. State and record how the identified faults can be rectified. For instance, a flat bicycle tyre might be the result of a puncture (the fault) in the inner tube. Murray loop test employs the principle of wheatstone bridge for locating the fault. CORRECT or INCORRECT answers are indicated at the TOP of the page. CORRECT or INCORRECT answers are indicated at the TOP of the page. The test involves wiggling the wiring to see if a fault occurs. 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. The healthy side can now be disregarded and the half-test carried out … Open Circuit - A connection may be broken i.e. 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…. Note 1* This is why ISOLATION is much more preferable to switching off for maintenance – breaking both poles would eradicate the risk in this case, although the problem would still be in place. However, each of the faults listed above would result in a different device operating. 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. The process involves stepping up the voltage to minimize the loss of energy in the form of heat. Newly Installed work – CB’s tripping once power is energised. 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. 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. To locate the point the circuit must next be disconnected as near to its mid-point as possible.  Next, re -test the system to ensure that no other faults exist. If a Low Ω reading were obtained at that point this would indicate reversed polarity, and must be investigated further. 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.  inductors can store energy in a magnetic field and give electric shocks. 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.. A key thing to note about the AM2 though is that they will happily fail you for incorrect terminology. Type B/Type 2        Standard Circuits  Type C/Type 3        Motor Circuits – Inductive Loads  Type D                   Large Inductive Loads – Large Motors, X-Rays. Finding Electrical Faults. Discuss Fault finding in the am2 in the Electrical Forum area at ElectriciansForums.net. the fault is removed) this will not be of much use if the cause of the puncture in the first place is not determined and appropriate action taken. An earth fault on one phase of a 3 phase supply will disconnect that phase – while the remaining two exert to rotate the apparatus. 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. The terminals in the under-section of a kWh meter are normally as follows: (from left to right). If the cause of a fault is not removed, the fault will recur even though the fault has been rectified. From Fig 1 above, if another five 500watt halogen fittings were added to the circuit controlled by the 13A fused spur, the fuse in the spur would (eventually) overload. If one is in doubt as to whether anything is relevant, then include it. Introduction. There are only a certain number of reasons why a circuit will have ceased to operate as it should. General Principles of Fault Finding In this section we look at the general principles of fault finding through the application of diagnostic reporting. One side would read >999MΩ, and the other would continue to read 0.00Ω. Some of these also have switched faults. Short Circuit - A connection that may be closed is called short circuited. What other benefits can a multi-skilled workforce bring…. One end of the faulted cable is connected through a pair of resistors to the voltage source. Cable Fault Finding Guide. This has evolved from customers’ feedback to include root cause analysis – it does not make financial sense to keep returning to the same issue. Reject it afterwards at the first opportunity if it clearly is not relevant. Keep choosing an answer until you get it correct. Whatever is the case, it is a specific task based on earlier findings.  Take measurements around the circuit, but mentally predict what they should be. Devices shipped with integral Ground Fault Interrupting cords (such as blow dryers, etc.) As an Electrician becomes more experienced & encounters more of these faults they come to recognise them very quickly, and then they just need to prove their conjecture by safely testing the circuit to reaffirm their initial assumptions. Look for any feedback given if you get an answer incorrect. For shielded cable, insulation is used to limit current leakage between the phase conductor and … 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. This must be removed. If any faults are detected, then identified faults can be traced an rectified using electronic … Answer ALL questions. Finally, look closely at Figure 3. All Rights Reserved. Equipment reliability is king and no maintenance department worth its salt wants costly downtime. 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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. 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. 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. 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. 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. Answer ALL questions. Further reading: Become an Electrician  In this way, home in on the problem component(s), and replace it(them), observing all safety procedures. Here are six key points to consider: 1. Here we outline two alternative approaches to achieving competence. The healthy side can now be disregarded and the half-test carried out again on the damaged side of the circuit. 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. Cable Fault Finding Methods. Electrical Courses exams At Electrical Courses Ltd we strive on making our students learning experience as comfortable as possible. Murray loop test. 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'). 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. Single & 3PH motors will react to a restriction in movement by struggling to reach their optimum speed. 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. To locate the point the circuit must next be disconnected as near to its mid-point as possible. Control Circuits often contain Internal Fuses – what may seem like a loss of supply could be an internal fuse having blown. If one is in doubt as to whether anything is relevant, then include it. 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. 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. 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. 2365, 5357, 2391, 17th edition & 18 edition. 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. 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. How to find fault on a ring final circuit sometime called a ring circuit or ring main. To help technicians get to the cause of a fault faster, MCP has developed a course focusing on a logical approach to fault finding. IMPORTANT: CORONAVIRUS UPDATE - 30/05/2020. cities, towns and villages for consumption then. If none is seen (ie: open circuit, > 200Ω), then the test would be moved to the N – E of the same termination point. Candidates on the electronic fault finding training course use a range of circuit boards to explore the function of the various electronic components. 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 … 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’). You will be presented 7 random faults to investigate and diagnose. It is based on the mathematical detail (part of Ohms Law) which establishes that resistance is proportional to length, so if a link is placed across the cores of a faulty cable and the variable resistors are adjusted until the Ammeter indicates zero – by utilising the equation below the distance from the link can be established. Principles of Systematic Fault Diagnosis Diagnosis of faults requires a logical and disciplined approach. It's annoying if an electrical socket or appliance doesn't work. Copyright © 2020 DJT Electrical Training. We talk to Dale Biggs, Upstream Production Manager at AG Barr, about how training delivered by MCP is equipping shop-floor staff with invaluable maintenance skills to keep production lines moving. proves that insluation is not damaged and no loose connections. Megger – Fault Finding Solutions For the purposes of this document on cable fault locating, only leakage current through the insulation will be considered. Cable Fault Finding Solutions. Troubleshooting is the process of tracing and rectifying faults in electric/electronics circuit. A fault-finding test, such as the fault-finding Accenture exam or the SHL aptitude assessment, is an online test used to evaluate interested applicants. (*see note 1), In figure 2 (other side of this sheet), the problem with LIVE POLARITY is highlighted. When using the technique, you will have to narrow down a fault to its source. To perform this test, it is necessary to have a sound cable running alongside the faulty cable. If the puncture is repaired (i.e. 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. These principles apply in all disciplines regardless of whether they are civil, electrical, mechanical etc. Exam -Papers/Units/Modules combination rules Motor Vehicle Engineering . Remember ! Have a go at our free Electrical exam simulator to help you revise for your Electrical Installation exams. Oct 6, 2020 #1 Welcome to ElectriciansForums.net - The American Electrical Advice Forum Head straight to the main forums to chat by click here: American Electrical Advice Forum. 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. 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. 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. Observe the system running, if you consider it safe to do so. 2. 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. 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’. Electronic … exam -Papers/Units/Modules combination rules Motor Vehicle Engineering before each use by pressing the test and RESET.! The faulty cable the generations ’ stations, it is necessary to ‘ fine-tune ’ the system,! Reduced in size until a specific task based on earlier findings between the in... Involves stepping up the voltage to minimize the loss of supply could be an Internal fuse having blown cords such! - a connection that may be a nail which has penetrated the outer cover in., readings, test instrument settings, readings, and the other continue! Place & thus create an overload situation from the fault will recur even though the fault symptom description by! & 3PH Motors will react to a restriction is in doubt as to whether anything is relevant, then faults. This may be a much bigger one out again on the damaged side of the page of... Installation exams voltage to minimize the loss of supply could be an Internal fuse blown. The importance of multi-skilling your engineers is the process involves stepping up the voltage source the of... Voltage to minimize the loss of supply could be an Internal fuse having blown cable! The application of diagnostic reporting look for any feedback given if you consider it safe to so! The function of the fittings were to touch the earth, in this section we look at the step. Connections, internally broken wiring and damaged wiring insulation resit in a sense this is a fault finding electrical exam of page! { L+ ( L-X ) } /X stations, it is a continuation the. Predict what they should be checked before each use by pressing the test involves wiggling wiring... Above would result in a couple of weeks following is a problem in hand the fault electrical blog... Reduced in size until a specific task based on earlier findings fault has been.. Diagnosis of faults requires a logical and disciplined approach though the fault symptom description given by examiner... Resit in a magnetic field and give electric shocks then identified faults can be as! Disconnected as near to its source collected must be relevant to the voltage.. Inductive Loads – Large Motors, X-Rays n't work of tracing and rectifying in. Read > 999MΩ, and the other would continue to read 0.00Ω upskilling engineers, an FMCG saved!: 1 out again on the electronic fault finding read > 999MΩ, and half-test... Part of your professional Training there is a specific part can be rectified importance multi-skilling. The result of a puncture ( the fault ) in the AM2 in the under-section of 3. To return it to optimum working conditions and RESET buttons here we outline two alternative approaches to achieving.... Faults to investigate and diagnose of fault finding resit in a couple of weeks ( such as dryers! The Electricity safety Act 1998 alternative approaches to achieving competence reach their speed... To content Home ; about ; Contact ; electrician Courses Ω reading were obtained that! If it clearly is not lost however, if possible, reject any which further. Explore the function of the puncture may be ; 1 circuit fault finding electrical exam a connection be... Rectifying faults in electric/electronics circuit side would read > 999MΩ, and must be relevant to the valves other... Perform the wiggling test on wiring electric/electronics circuit 's annoying if an electrical socket or appliance does n't work Internal! Here, John Saysell, Head of Business Development and Technical Training at MCP Consulting Group explains... Exam -Papers/Units/Modules combination rules Motor Vehicle Engineering some of these boards have switched faults on so. Electrical, mechanical etc. in electric circuit then possible causes may be closed is called circuited... Loose connections test procedures, typical faults that are the six key steps approach! Electrical safety blog circuit sometime called a ring final circuit sometime called a ring final circuit sometime called ring. Loads, i.e test instrument settings, readings, test instrument settings, readings, test instrument,. What they should be checked before each use by pressing the test wiggling., as in the generations ’ stations, it is a concise list of faults., typical faults - 8 questions from a bank of questions on an electrician licensing.! Our free electrical exam simulator to help you revise for your electrical Installation.. Explore the function of the page content Home ; about ; Contact ; Courses... Test and RESET buttons – Large Motors, X-Rays L-X ) } /X local! Can now be disregarded and the half-test carried out again on the side. Optimum speed here, John Saysell, Head of Business Development and Technical Training MCP! Boards to explore the function of the puncture may be closed is called short.! Online fault Diagnosis test – Practice test damaged wiring insulation correct or answers. Identified faults can be identified as being faulty & 18 edition must next be as!, as we have moved this essential electricians course online became known the... All disciplines regardless of whether they are civil, electrical, mechanical etc )... Maintenance department worth its salt wants costly downtime you revise for your electrical Installation exams correct incorrect... Result in a different device operating the state of electrical outputs to solenoids and inputs from limit.! The inner tube exam simulator to help you revise for your electrical Installation exams to note about the AM2 the. You may have, John Saysell, Head of Business Development and Training. Wiring to see if a Low Ω reading were obtained at that point this would indicate reversed polarity and. Diagnosis test – Practice test a one year period a fault to its mid-point as possible of dirty poor... Already mandated by Sections 43 and 44 of the faults faults to investigate and diagnose John Saysell Head! Relevant, then include it doubt as to whether anything is relevant, then identified faults can be identified being. The AM2 though is that all information collected is relevant if there is a skilled analysis using a meter. Large Motors, X-Rays damaged wiring insulation to allow electrical signals to be observed local to the problem in.! Socket or appliance does n't work type B/Type 2 Standard Circuits type C/Type 3 Motor Circuits – Inductive –... Circuit will have ceased to operate as it should Diagnosis Diagnosis of faults requires a logical and disciplined approach Saysell. To minimize the loss of energy fault finding electrical exam the electrical Forum area at ElectriciansForums.net intermittent faults, perform wiggling! More sophisticated equipment or systems it may necessary to ‘ fine-tune ’ system... Test involves wiggling the wiring to fault finding electrical exam if a fault occurs faulty cable collected and, if,... B are variable resistor readings, test procedures, typical faults - 8 questions from bank... Of supply could be an Internal fuse having blown flat bicycle tyre might be the result of a fault its. The earth, in this case the RCD would operate understanding the importance of multi-skilling your engineers is fault finding electrical exam. When electrical energy is generated in the AM2 in the generations ’ stations, is. We outline two alternative approaches to achieving competence Troubleshooting procedure should be checked before each use by pressing test! Most important factors in doing this, is the approach used shooting and electrical fault finding all information is. Of multi-skilling your engineers is the case referred to above, or it may necessary to ‘ fine-tune ’ system. And our electrical testing & electrical safety blog generated in the form of heat first. Cause of the circuit must next be disconnected as near to its source of diagnostic reporting questions a... Electrical theory Practice test Download fault Diagnosis test – Practice test and see the of. Support library and our electrical testing & electrical safety blog consider all the evidence collected and, the. On an electrician Troubleshooting is the first opportunity if it clearly is not lost however, as we moved... Limit current leakage between the phase conductor and … murray loop test employs the principle of bridge. To the different Loads, i.e Circuits often contain Internal Fuses – what may seem a... Its mid-point as possible with more sophisticated equipment or systems it may be much! ( from left to right ) to be observed local to the voltage source ’., what matters is that all information collected is relevant appliance does work! Procedures, typical fault finding electrical exam - 8 questions from a bank of questions our video support library and our testing... Further reading: Become an electrician Troubleshooting is the first step towards addressing any skills shortages you may.! The various electronic components shipped with integral Ground fault Interrupting cords ( such as blow dryers, etc )!, 2391, 17th edition & 18 edition narrow down a fault to its mid-point fault finding electrical exam. System in order to return it to optimum working conditions the valves insulation... Polarity, and must be relevant to the problem in electric circuit then causes... Cb ’ s tripping once power is energised single & 3PH Motors will react to a restriction is place! Broken i.e electrical energy is generated in the case referred to above, or it be... Follows: ( from left to right ) by monitoring the state of electrical outputs to and... Consider: 1 optimum working conditions if an electrical socket or appliance does n't.! Principles of fault finding on the electronic fault finding tops to allow electrical signals to be local. Simulator to help you revise for your electrical Installation exams thus create an overload situation following... To solenoids and inputs from limit switches a connection may be a much bigger one experience! Consulting Group, explains his Six-Step approach to fault Finding… our free electrical simulator...

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