8 Which situation will not require a label stating ‘Safety Electrical Connection – Do Not remove’?

D. The connection to a Main Earthing Terminal within a consumer unit.

A. Connecting a bonding conductor to a metallic installation gas pipe.

B. An Earthing conductor connected to an installation earth electrode.

C. A supplementary bonding conductor connected to a metallic water pipe.

9 What must be checked when inspecting a consumer unit for compliance with Basic Protection requirements?

B. Enclosures meet the IP requirements.

A. All cable terminations are tight.

C. Live conductors are correctly identified.

D. Protective devices are the correct rating.

11 What action must be taken when a loose connection is found to a pipe during the inspection of a main protective bonding conductor termination?

A. The defect must be made good and inspected before certification.

B. A defect report must accompany the Electrical Installation Certificate.

C. The continuity test between the MET and the pipe should be carried out.

D. A note is made on the Electrical Installation Certificate under ‘Departures’.

12 What best describes the protection offered by IPXXB?

A. Protection against access to live parts.

B. Protection against the ingress of solids.

C. Protection against the ingress of water.

14 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?

D. All installations tested since the last calibration should be checked.

A. The last installation tested should be retested.

B. The test leads for this instrument must be replaced.

C. All installations tested in the last three months should be retested.

15 What instrument would give the most accurate results when carrying out an earth electrode resistance test?

C. A three or four-terminal earth electrode tester.

B. An earth fault loop impedance tester.

D. A stakeless or probe type earth electrode tester.

16 Why does BS 7671 give a defined sequence of tests when carrying out Initial Verification?

D. To ensure the safety of the person carrying out the tests.

A. To ensure all tests are carried out.

B. To ensure the Schedule of Test Results is complete.

C. To ensure live tests are carried out in the correct order.

18 What is the main purpose of verifying that extraneous conductive parts of an installation are effectively connected to the MET?

D. To confirm that only a low potential will exist between exposed and extraneous conductive parts under fault conditions.

A. To confirm that they provide a reliable path for fault currents to flow to earth.

B. To confirm that there is a reliable connection between the MET and the means of earthing.

C. To confirm that they will reduce values of earth fault loop impedance to comply with BS7671.

19 Where on a lighting circuit would a test of continuity of protective conductors be carried out?

B. At every light and switch point.

C. At the furthest point in the circuit

D. At every light and each switch with a metallic plate.

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?

B. They must be GS 38 compliant.

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?

D. Line and neutral conductor connections are reversed.

A. The line conductor is not connected.

B. The neutral conductor is not connected.

C. Line and cpc conductor connections are reversed.

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?

C. Incorrect cross connection of conductors at the consumer unit.

A. Incorrect polarity at one of the sockets on the circuit

B. Reduced size circuit protective conductor in the cable.

D. Interference from other circuits connected to the consumer unit.

What is the most appropriate method of verifying the polarity of the ring final circuit?

D. Comparing the test results from stage 2 and stage 3 as identified in GN3.

A. Using a long lead and testing from the MET to each socket in turn.

B. Testing at each socket using and earth fault loop impedance tester.

C. Linking line and cpc and testing at each socket between line and cpc.

Tests are to be carried out on a newly installed installation forming part of 230 V singlephase 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 ½ IΔn test on an RCD?

B. The RCD is not subject to nuisance tripping.

A. The disconnection time will be met.

C. The RCD will operate when a fault current occurs.

D. The requirements for additional protection will be met.

Tests are to be carried out on a newly installed installation forming part of 230 V singlephase 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?

C. To verify it meets the requirements for Additional Protection.

A. To ensure the RCD mechanism works correctly.

B. To verify it meets the requirements of BS EN 61008.

D. To verify it meets the requirements for Automatic Disconnection.

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?

C. To ensure the DNO’s incoming supply has the correct polarity.

A. To verify that double-pole switches will automatically operate.

B. To replace the need for a dead polarity test on the installation.

D. To verify that the polarity throughout the installation is correct.

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?

D. To verify that the short circuit breaking capacity of the protective devices exceed the value of prospective fault current.

A. To verify that the protective devices operate in the disconnection time given in BS 7671.

B. To verify that the protective conductors of the installation can withstand the prospective fault current.

C. To verify that the prospective fault current exceeds the breaking capacities of the protective devices.

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?

B. To verify the impedance is low enough to cause a high fault current to flow.

A. To verify the impedance is high enough to ensure RCDs are tripped.

C. To verify the impedance is high enough to cause a low fault current to flow.

D. To verify that the fault current exceeds the breaking capacity of the protective device.

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?

D. The test is repeated to confirm consistent readings.

A. Turn on the anti-trip function on the instrument.

B. Turn off the anti-trip function on the instrument.

C. The instrument is on the lowest measuring range.

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?

A. The tabulated values in BS 7671.

B. The values in Guidance Note 3.

40 What is the purpose of the phase-sequence test?

B. To ensure that three-phase motors turn in the correct direction.

A. To ensure harmonic currents are not created on the system.

C. To ensure balanced loads on the three-phase distribution board.

D. To ensure single-pole protective devices are in the line conductor.

2391-50 Inspection and Testing

Quiz

•

Other

•

1st - 12th Grade

•

Practice Problem

•

Hard

Chris Falet

Used 41+ times

FREE Resource

C. To confirm the installation is complete and it is safe to commence testing.

D. To confirm the Earthing Conductor is connected and it is safe to commence testing.

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2391-50 Inspection and Testing

40 questions

1 What is the main purpose of an Initial Verification?

2 What situation requires the issuing of a Minor Electrical Installation Works Certificate?

3 Which statutory document contains specific information relevant to Initial Verification?

4 What is the minimum voltage which requires the test leads and probes to comply with GS38?

5 How many voltage measurements are required to confirm that a three-phase four-wire installation is safely isolated?

6 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?

7 Why does BS 7671 require inspection to be carried out before testing?

8 Which situation will not require a label stating ‘Safety Electrical Connection – Do Not remove’?

9 What must be checked when inspecting a consumer unit for compliance with Basic Protection requirements?

10 Which two senses are used when inspecting the terminations at a newly installed motor?

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