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Question 1 of 60
What is the main purpose of an Initial Verification?
Question 2 of 60
What situation requires the issuing of a Minor Electrical Installation Works Certificate?
Question 3 of 60
Which statutory document contains specific information relevant to Initial Verification?
Question 4 of 60
What is the minimum voltage which requires the test leads and probes to comply with GS38?
Question 5 of 60
How many voltage measurements are required to confirm that a three-phase four-wire installation is safely isolated?
Question 6 of 60
What precaution is required before carrying out a test of external earth fault loop impedance (Ze) so as to avoid danger to users of an installation?
Question 7 of 60
Why does BS 7671 require inspection to be carried out before testing?
Question 8 of 60
Which situation will not require a label stating, ‘Safety Electrical Connection – Do Not remove’?
Question 9 of 60
What must be checked when inspecting a consumer unit for compliance with Basic Protection requirements?
Question 10 of 60
Which two senses are used when inspecting the terminations at a newly installed motor?
Question 11 of 60
What action must be taken when a loose connection is found to a pipe during the inspection of a main protective bonding conductor termination?
Question 12 of 60
What best describes the protection offered by IPXXB?
Question 13 of 60
What is the minimum IP rating for electrical equipment installed in Zone 2 of a bathroom?
Question 14 of 60
The calibration of an Earth Fault Loop Impedance tester reveals that the instrument is outside of specification. Regular accuracy checks on the instrument have not been carried out for six months.
What immediate action must be taken by the contractor?
Question 15 of 60
What instrument would give the most accurate results when carrying out an earth electrode resistance test?
Question 16 of 60
Why does BS 7671 give a defined sequence of tests when carrying out Initial Verification?
Question 17 of 60
Which test method is used to verify that extraneous conductive parts of an installation are effectively connected to the MET?
Question 18 of 60
What is the main purpose of verifying that extraneous conductive parts of an installation are effectively connected to the MET?
Question 19 of 60
Where on a lighting circuit would a test of continuity of protective conductors be carried out?
Question 20 of 60
What would cause the value of r2 to be higher than r1 and rn when carrying out step 1 of a continuity of ring-final circuit test?
Question 21 of 60
What is the test voltage for an insulation resistance test carried out on a 230 V circuit containing socket-outlets with surge protection devices which cannot be removed?
Question 22 of 60
During the construction of an installation, insulation resistance tests have been carried out between live conductors and earth on the individual circuits and the L to E results are shown below.
What is the expected value of insulation resistance L to E when the whole installation is tested?
Circuit No L-E in MΩ
1 120
2 120
3 130
4 150
Question 23 of 60
Questions 23 to 25 relate to the following scenario:
The conductors of a newly installed ring final circuit are to be tested for continuity. The circuit is wired in PVC single core cables contained in PVC conduit. All circuit conductors are 2.5mm2 and the end to end length of each loop is 75m.
What action is required regarding the instrument test leads?
Question 24 of 60
Questions 23 to 25 relate to the following scenario:
The conductors of a newly installed ring final circuit are to be tested for continuity. The circuit is wired in PVC single core cables contained in PVC conduit. All circuit conductors are 2.5mm2 and the end to end length of each loop is 75m.
What is the expected resistance of each of the loops tested in stage 1 as shown in GN3?
Question 25 of 60
Questions 23 to 25 relate to the following scenario:
The conductors of a newly installed ring final circuit are to be tested for continuity. The circuit is wired in PVC single core cables contained in PVC conduit. All circuit conductors are 2.5mm2 and the end to end length of each loop is 75m.
Whilst testing the ring final circuit the reading at one of the socket-outlets for stage 2 was found to be 0.42 Ω but an over range reading was obtained for stage 3. What condition would cause these results?
Question 26 of 60
What is the most likely cause of significantly different readings at each socket-outlet when carrying out stage 3, as shown in GN3, during testing of a newly installed ring final circuit?
Question 27 of 60
What is the most appropriate method of verifying the polarity of the ring final circuit?
Question 28 of 60
Questions 28 to 32 relate to the following scenario:
Tests are to be carried out on a newly installed installation forming part of 230 V single- phase TT system. The installation is protected by a 300 mA BS EN 61008 RCD installed for fire protection. 30mA BS EN 61009 RCBOs are installed protecting each outgoing circuit.
How is the maximum resistance for the installation earth electrode determined?
Question 29 of 60
Questions 28 to 32 relate to the following scenario:
Tests are to be carried out on a newly installed installation forming part of 230 V single- phase TT system. The installation is protected by a 300 mA BS EN 61008 RCD installed for fire protection. 30mA BS EN 61009 RCBOs are installed protecting each outgoing circuit.
What is verified by carrying out a 1⁄2 IΔn test on an RCD?
Question 30 of 60
Questions 28 to 32 relate to the following scenario:
Tests are to be carried out on a newly installed installation forming part of 230 V single- phase TT system. The installation is protected by a 300 mA BS EN 61008 RCD installed for fire protection. 30mA BS EN 61009 RCBOs are installed protecting each outgoing circuit.
What is the main purpose for carrying out a 5 IΔn test on a 30 mA RCD protecting 13 A socket-outlets in a dwelling?
Question 31 of 60
Questions 28 to 32 relate to the following scenario:
Tests are to be carried out on a newly installed installation forming part of 230 V single- phase TT system. The installation is protected by a 300 mA BS EN 61008 RCD installed for fire protection. 30mA BS EN 61009 RCBOs are installed protecting each outgoing circuit.
What would be the x1 test current for an RCD having the maximum rating when providing fire protection?
Question 32 of 60
Questions 28 to 32 relate to the following scenario:
Tests are to be carried out on a newly installed installation forming part of 230 V single- phase TT system. The installation is protected by a 300 mA BS EN 61008 RCD installed for fire protection. 30mA BS EN 61009 RCBOs are installed protecting each outgoing circuit.
What are the correct test tripping time for the 30 mA BE EN 61009 RCBOs when tested at 1x IΔn?
Question 33 of 60
Questions 33 to 40 relate to the following scenario:
A commercial storage unit has been rewired and the installation forms part of 400/230 V three-phase TN-S system. All ‘dead’ tests have been completed. ‘Live’ testing is about to commence.
Why is a live polarity check carried out at the origin of the installation?
Question 34 of 60
Questions 33 to 40 relate to the following scenario:
A commercial storage unit has been rewired and the installation forms part of 400/230 V three-phase TN-S system. All ‘dead’ tests have been completed. ‘Live’ testing is about to commence.
What is the reason for verifying the prospective fault current at the origin of the installation?
Question 35 of 60
Questions 33 to 40 relate to the following scenario:
A commercial storage unit has been rewired and the installation forms part of 400/230 V three-phase TN-S system. All ‘dead’ tests have been completed. ‘Live’ testing is about to commence.
What is the purpose of verifying the earth fault loop impedance at the furthest point on each final circuit?
Question 36 of 60
Questions 33 to 40 relate to the following scenario:
A commercial storage unit has been rewired and the installation forms part of 400/230 V three-phase TN-S system. All ‘dead’ tests have been completed. ‘Live’ testing is about to commence.
What action should be taken to allow for the effect of transient voltages when carrying out earth fault loop impedance tests?
Question 37 of 60
Questions 33 to 40 relate to the following scenario:
A commercial storage unit has been rewired and the installation forms part of 400/230 V three-phase TN-S system. All ‘dead’ tests have been completed. ‘Live’ testing is about to commence.
What factor can significantly reduce the values of measured earth fault loop impedance, compared to a calculated figure obtained using measured Ze and measured R1 + R2 values?
Question 38 of 60
Questions 33 to 40 relate to the following scenario:
A commercial storage unit has been rewired and the installation forms part of 400/230 V three-phase TN-S system. All ‘dead’ tests have been completed. ‘Live’ testing is about to commence.
What value requires the application of a multiplier correction factor when confirming an earth fault loop impedance test result complies with the IET Wiring Regulations?
Question 39 of 60
Questions 33 to 40 relate to the following scenario:
A commercial storage unit has been rewired and the installation forms part of 400/230 V three-phase TN-S system. All ‘dead’ tests have been completed. ‘Live’ testing is about to commence.
The water heater circuit is wired in 6mm2 with a 2.5mm2 cpc conductors and is protected by a 32 A BS 88-2 fuse.
What is the maximum permitted measured earth fault loop impedance value for compliance with BS 7671?
Question 40 of 60
Questions 33 to 40 relate to the following scenario:
A commercial storage unit has been rewired and the installation forms part of 400/230 V three-phase TN-S system. All ‘dead’ tests have been completed. ‘Live’ testing is about to commence.
What is the purpose of the phase-sequence test?
Question 41 of 60
What would be the correct procedure to confirm that the existing electrical installation in a dwelling is suitable for the additional wiring of an extension?
Question 42 of 60
What is the purpose of a periodic inspection and test relating to the safety of the building?
Question 43 of 60
What is the minimum level of IP protection for the opening shown as Item A in Figure 1?
Question 44 of 60
What is the minimum level of IP protection for the accessible top surface of a consumer unit?
Question 45 of 60
Which publication gives detailed information for carrying out testing of electrical installations?
Question 46 of 60
What would be agreed with the client and recorded as a limitation for a periodic inspection and test?
Question 47 of 60
Which statutory document includes the requirements for working on live conductors?
Question 48 of 60
What action should the inspector take, both before and after testing, to confirm isolation
of the supply?
Question 49 of 60
Questions 49 to 51 relate to the following scenario.
An inspection is to be carried out at the termination of the circuit conductors inside a terminal box, as shown in Figure 2.
Which human sense is best used to confirm the terminals are suitably tightened?
Question 50 of 60
Questions 49 to 51 relate to the following scenario.
An inspection is to be carried out at the termination of the circuit conductors inside a terminal box, as shown in Figure 2.
What is confirmed when inspecting the conductor insulation?
Question 51 of 60
Questions 49 to 51 relate to the following scenario.
An inspection is to be carried out at the termination of the circuit conductors inside a terminal box, as shown in Figure 2.
Which classification code would be given on the Schedule of Inspections for the situation shown in Figure 3?
Question 52 of 60
Which classification code indicates that there is a non-compliance which is identified as ‘improvement recommended’?
Question 53 of 60
Which human senses would be best used to determine excess arcing at a contactor during a walk around survey?
Question 54 of 60
Questions 54 to 57 relate to the following scenario.
A test is to be carried out to confirm the continuity of the main protective bonding conductor to the metallic water installation pipework in a commercial premises.
What is the risk if the installation is not safely isolated for this test?
Question 55 of 60
Questions 54 to 57 relate to the following scenario.
A test is to be carried out to confirm the continuity of the main protective bonding conductor to the metallic water installation pipework in a commercial premises.
What is the purpose of the test of continuity of main protective bonding conductors?
Question 56 of 60
Questions 54 to 57 relate to the following scenario.
A test is to be carried out to confirm the continuity of the main protective bonding conductor to the metallic water installation pipework in a commercial premises.
What important check must be made with the instrument leads before a reading is taken?
Question 57 of 60
Questions 54 to 57 relate to the following scenario.
A test is to be carried out to confirm the continuity of the main protective bonding conductor to the water installation pipework in a commercial premises.
Which test method is used for this test?
Question 58 of 60
A 10 mm2 main protective bonding conductor is 37.5 m in length.
Question 59 of 60
What is the most likely cause of the measured value being much higher than the calculated value?
Question 60 of 60
What is confirmed by an earth fault loop impedance test on a radial power circuit?
