EST Electrical Service Technician Answer Schedule

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1 EST Electrical Service Technician Answer Schedule Notes:1. means that the preceding statement/answer earns 1 mark. 2. This schedule sets out the accepted answers to the examination questions. A marker can exercise their discretion and decide on the overall accuracy of any answer that is presented in the candidate s own words. Question 1 Marks Reference Marking notes (a) Any ONE of: Details of the nature of the danger. ESR 19(2A)(a) How and why the works, ESR 19(2A)(b) installation, fitting, or appliance presents an immediate danger to life or property. Any steps that have been taken, or ESR 19(2A)(c) that the person reasonably believes should be taken, to minimise or eliminate the danger. (b) Any ONE of: The appliance is fixed wired and ESR 89(2)(a) connected through a continuous flexible cord to a supply of electricity from a source isolated from earth with a voltage between conductors not exceeding 250 volts a.c. The appliance is supplied with ESR 89(2)(c) electricity from a monitored earth circuit where the supply to the appliance is automatically interrupted if the earth to the appliance is broken or disconnected The appliance is supplied with ESR 89(2)(e) electricity through an RCD that provides protection against electric shock The appliance is supplied with ESR 89(2)(f) electricity from a source isolated from earth with a voltage between conductors not exceeding 250 volts a.c. The appliance is double-insulated ESR 89(2)(g) (c) (i) 1 MΩ AS/NZS 3760 Table 2 (ii) 5 ma AS/NZS 3760 Table 1 FINAL- EST 2075 ANSWERS 25 NOVEMBER

2 Question 1 Marks Reference Marking notes (d) It detects the phase reversal and prevents the motor from starting. (e) Any TWO of: The hold-in contacts are broken There is foreign matter preventing the core from closing. There is a loose wire to a hold-in contact terminal (f) (i) Any ONE of: Reverse the connections to the start winding. Reverse the connections to the run winding. (ii) Any ONE of: Reverse the connections to the field windings. Reverse the connections to the armature. (g) Any TWO of: Category of duty (Rupturing Capacity) Fusing factor (utilisation category) Rated for a.c. or d.c. (h) (i) Decrease (ii) Decrease (i) The wrong isolating switch has been operated. The isolating switch is damaged (j) Insulation resistance. Fusing factor FINAL- EST 2075 ANSWERS 25 NOVEMBER

3 Question 2 Marks Reference Marking notes (a) Any FOUR of: Ensure the instrument is suitable for the task. Ensure instrument, clips, leads and probes are in good condition. Ensure the amps function is selected when measuring current. Ensure the range selected can measure at least 10 A. Ensure the volts function is selected when measuring voltage. Ensure the range selected can measure at least 230 V. Ensure leads are correctly connected. (4 marks) (b) It was ineffective because no test was carried out between phase and earth or between phase and neutral. (c) Prove the meter is operating correctly on a known live circuit. Test that the circuit is isolated. Prove again that the meter is still operating correctly on a known live circuit. (d) Any ONE of: Lock open the isolating switch. Lock open the MCB. Disconnect the final subcircuit cable at the switchboard. Disconnect the cable supplying the electrical appliance at the isolator. Use an access permit or hold card system. FINAL- EST 2075 ANSWERS 25 NOVEMBER

4 Question 3 Marks Reference Marking notes (a) (i) (ii) The maximum current that the fuse is designed to carry continuously. The maximum voltage the fuse is designed to withstand without insulation breakdown (iii) It is the maximum prospective short circuit current the fuse can safely interrupt. (b) As current through a protective device increases. The time taken to operate decreases. (c) The HRC fuses operate much faster than the thermal overload under short circuit conditions. (d) Any TWO of: It prevents the fuse wire from bulging out the side of the carrier and being accessible to touch. Under overload conditions the heat produced by the fuse wire is confined to the tunnel area. Under short-circuit conditions the arc from the molten fuse wire is confined within the fuse carrier and base. FINAL- EST 2075 ANSWERS 25 NOVEMBER

5 Question 4 Marks Reference Marking notes (a) The description must to show: Opening the isolator. (½ mark) Using a volt meter to test for isolation at the load side of the isolator Using the prove-test-prove method. Locking the isolator open. Attaching a danger tag to the (½ mark) isolator. Isolation can be carried out at the switchboard, but testing must occur at the isolator. (b) Test between a pair of phase conductors in turn. Each pair of conductors connected to the windings will have the same resistance. (c) Insulation resistance tester (½ mark) 500 V d.c. (½ mark) Test between each winding and the frame of the motor. Test between each of the windings A test result of 1 MΩ or more FINAL- EST 2075 ANSWERS 25 NOVEMBER

6 Question 5 Marks Reference Marking notes (a) Phase to Phase = 400V (½ mark) Phase to Neutral = 230V (½ mark) Phase to Earth = 230V (½ mark) Neutral to Earth = 0 V (½ mark) (b) Means a switchboard that has a connection to an earth electrode via an earthing conductor, and a connection between earth and neutral made by a removeable link, for the purposes of creating an MEN system. ESR 4 (c) It provides a return path for the out-ofbalance currents. (d) Any ONE of: When the loading on the three phases are balanced. Where the load is delta-connected. (e) (i) 50Hz (ii) 325 volts FINAL- EST 2075 ANSWERS 25 NOVEMBER

7 Question 6 Marks Reference Marking notes (a) Any FOUR of: Number of cores Colour of the cord conductors Mechanical strength if weight is to be supported. Sheath suitable for the environment Cord construction (b) (i) Voltage is dropped as the load current passes through the conductor resistance (ii) Use a flexible cord with an increased cross-sectional area Use a shorter flexible cord (c) It is the maximum current that a flexible cord is designed to safely carry (d) The length (e) The order (polarity) of connection of a three-pin flat pin plug to their connection, shall be: Earth (radial pin green/yellow wire) (½ mark) AS/NZS 3670 Table C1 (½ mark) Neutral (blue wire) (½ mark) Active (brown wire) (½ mark) In a clockwise direction when viewed from the front of the plug looking at the pins. FINAL- EST 2075 ANSWERS 25 NOVEMBER

8 Question 7 Marks Reference Marking notes (a) Test 1 Test Insulation resistance test AS/NZS 3760: Tests 1 and 2 can be answered in any order Instrument Insulation resistance tester How the test is carried out Test between each of the phase pins Test between each phase pin and the frame of the appliance. Result 1 MΩ minimum AS/NZS 3760: Table 2 (b) Test 2 Test Leakage current test AS/NZS 3760: Instrument Any ONE of: * Earth leakage tester * Clip-on ammeter How the test is carried out With the appliance live Measure the leakage current in the protective earthing conductor. Result 5 ma maximum AS/NZS 3760: Table 1 FINAL- EST 2075 ANSWERS 25 NOVEMBER

9 Question 8 Marks Reference Marking notes (a) Disconnect the supply (½ mark) Remove the appliance terminal cover. Restore the supply (½ mark) Clamp the ammeter around the phase or neutral conductor Measure the current drawn on each setting. (b) Disconnect the flexible cord from the isolator Use an ohmmeter Measure the resistance between phase and neutral of the flexible cord at each operational setting. Calculate the current drawn at each operational setting. The calculations can be done using the information off the appliance nameplate. FINAL- EST 2075 ANSWERS 25 NOVEMBER

10 Question 9 Marks Reference Marking notes (a) (i) Fuse Stop Start O/L P Hold-in contact Contactor coil N P Supply correctly connected (½ mark) Fuse correctly connected (½ mark) Stop button correctly (½ mark) connected Start button correctly (½ mark) connected Hold-in contacts correctly (½ mark) connected Contactor coil correctly (½ mark) connected Overload auxiliary contact (½ mark) correctly connected Correct working circuit (½ mark) (ii) Connect a fuse in the new phase Any ONE of - Connect another phase to the neutral terminal of the circuit - Change the colour of the neutral conductor to a phase colour No marks for (ii), if a fuse is not used. (b) The thermistor control relay detects a change in resistance of the thermistor. The thermistor resistance has changed due to a rise in temperature in the motor winding. (c) The maintaining circuit is opencircuited. FINAL- EST 2075 ANSWERS 25 NOVEMBER

11 FINAL- EST 2075 ANSWERS 25 NOVEMBER

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