epic itb; teacher’s forum 30 may 2013. common faults main switch type & labelling main earth...
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LEA Assessor PresentationLEP Results
2012-2013
EPIC ITB; teacher’s forum
30 May 2013
Why less candidates ???Q1 Meter Board & Switchboard Wiring
LEP RESULTS: April 2012 – April 2013
0% 0-24% 25-49% 50-74% 75-100%0
200
400
600
800
1000
1200
1400
1600
Installation Testing ( 51 )MEN System ( 9 )Visual Defects ( 15 )Wiring ( 25 )
Why less candidates ???LEP RESULTS; Jan - April 2012
0% 0-24% 25-49% 50-74% 75-100%0
50
100
150
200
250
300
350
Installation Testing ( 51 )MEN System ( 9 )Visual Defects ( 15 )Wiring ( 25 )
Why less candidates ???LEP RESULTS; Jan - April 2013
0% 0-24% 25-49% 50-74% 75-100%0
50
100
150
200
250
300
Installation Testing ( 51 )MEN System ( 9 )Visual Defects ( 15 )Wiring ( 25 )
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)
Q1. Meter Board & Switchboard Wiring
Q1. Meter Board & Switchboard Wiring
HWS wired through the wire tie holes, instead of meter holes.
HWS wired through the wire tie holes, instead of meter holes.
Q1. Meter Board & Switchboard Wiring
80A Main Switch, not MCB
HWS neutral on protected Neutral Bar
Cables not connected to Main Switch
Q1. Meter Board & Switchboard Wiring
A good example of what is required
Q2. Electrical Installation Testing
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
Q2. Electrical Installation Testing
Q2.2 Insulation 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
Q2. Electrical Installation Testing
Q2.2 Insulation 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
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
Q2. Electrical Installation Testing
Q2.4 Polarity 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
Q2. Electrical Installation Testing
Q2.5 Polarity Testing – Operation of Switches
Common Faults Identifying Whether Neutral or Neither is Switched
Understanding importance of neutral polarity Understanding test procedure Interpreting test results
Q2. Electrical Installation TestingQ2.6 Resistance 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
Q3. MEM System Voltage Measurement
Q3.1 Voltage 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
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
Q4. Visual Defects
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