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EPIC ITB; teacher’s forum 30 May 2013. Common Faults  Main Switch Type & Labelling  Main Earth Tag & Electrode Location Labelling  Main Earth.

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Presentation on theme: "EPIC ITB; teacher’s forum 30 May 2013. Common Faults  Main Switch Type & Labelling  Main Earth Tag & Electrode Location Labelling  Main Earth."— Presentation transcript:

1 EPIC ITB; teacher’s forum 30 May 2013

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5 Common Faults  Main Switch Type & Labelling  Main Earth Tag & Electrode Location Labelling  Main Earth Connection  RCD Polarity  Switchboard Wiring  Overload Protection  Equipment Selection  Underground Information  Use of Cable Ties  Hot Water Selection & Cabling  Address Information (Meter Panel, Pit)

6 Q1. Meter Board & Switchboard Wiring HWS wired through the wire tie holes, instead of meter holes.

7 80A Main Switch, not MCB HWS neutral on protected Neutral Bar Cables not connected to Main Switch

8 Q1. Meter Board & Switchboard Wiring A good example of what is required

9 2.1 Resistance of Main Earthing and Bonding Conductors Common Faults  Reading of Meter  Wrong scale  Wrong unit  Poor accuracy  Meter Scale Selection  3 ohm  500 ohm  500V  Not selecting highest scale when reading FSD on 3 ohm scale

10 Q2.2Insulation Resistance of Wiring Common Faults  Reading of Meter  Wrong scale selection  Wrong unit identified  Poor accuracy when reading result  Calibration of Meter  Understanding of calibration procedure  Interpretation of Pass/Fail Values  Constant rechecking calibration throughout test

11 Q2.2Insulation Resistance of Wiring Common Faults  Reading of Meter  Wrong scale selection  Wrong unit identified  Poor accuracy when reading result  Calibration of Meter  Understanding of calibration procedure  Interpretation of Pass/Fail Values  Constant rechecking calibration throughout test

12 Q2.3 Earthing & Insulation Resistance of Appliance Common Faults  Identifying element  Sheathed  Non Sheathed  Reading of Meter  Wrong scale selection  Wrong unit identified  Poor accuracy when reading result  Calibration of Meter  Understanding of calibration procedure  Interpretation of Pass/Fail Values  Constant rechecking calibration throughout test  Q2. Electrical Installation Testing

13 Q2.4Polarity Testing – Consumer Mains Common Faults  Meter Scale Selection  Understanding the test reading requirements  Understanding test procedure  Selecting highest scale for FSD on 3 ohm  Pass versus Fail Values  Understanding pass/fail requirements  Interpreting meter readings

14 Q2.5Polarity Testing – Operation of Switches Common Faults  Identifying Whether Neutral or Neither is Switched  Understanding importance of neutral polarity  Understanding test procedure  Interpreting test results

15 Q2.6Resistance of Protective Earthing Conductors Common Faults  Meter Scale Selection  Understanding the test reading requirements  Understanding test procedure  Selecting correct scale for FSD  Pass versus Fail Values  Understanding pass/fail requirements  Interpreting meter readings  Omission of unit  Incorrect unit

16 Q3.1Voltage Measurements Common Faults  Selection of Meter Scale  Understand 250V requirement  Selecting highest possible scale  Voltage Readings  Understanding difference between appliance frame and water pipe  Omission of the Supply Voltage

17  Q3.2 Statement Explaining Voltage readings in Q3.1  Common Faults  Description of MEN System  Little or no understanding of MEN  Leaving blank, or mis-interpreting  Variable Voltages  Little or no understanding of voltage  Not fully understanding voltage potential versus current flow  Fault Identification  Unable to identify fault against relevant code  Mis-interpreting relevant code  Unable to determine/identify relevant code  Status of the Installation  Not identifying safe/unsafe as per codes Q3. MEM System Voltage Measurement

18 Common Faults  Description of Defect & Location  Unclear description  Lack of certainty about what the defect is  AS/NZS 3000 Rule Number  Incomplete  Not Provided  Incorrect


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