Question 1

If a polarity test identifies that a light switch as been wired in the Phase, what does this mean?

• That the lighting circuit will not operate.

• That the phase and neutral conductors have been connected to the incorrect terminals within the light switch.

• That the lighting circuit has been correctly installed.

• That a live voltage will be present at the lamp holder and ceiling rose even if the switch and lamp are off.

Question 2

If a polarity test identifies that a light switch has been wired in the Neutral, what does this mean?

• That a live voltage will be present at the lamp holder and ceiling rose even if the switch and lamp are off.

• That the lighting circuit has been correctly installed.

• That the phase and neutral conductors have been connected to the incorrect terminals within the light switch.

• That the lighting circuit will not operate.

Question 3

During an installation inspection, what may need to be concentrated on in an agricultural installation?

• Be aware of possible vermin damage ? that the wiring system is robust enough to survive mechanical impact and varying weather conditions and that RCD?s and earth electrodes have been installed where necessary.

• That the installation is metal clad with extra mechanical protection provided by SWA cable.

• That cable runs do not go over ground where animals will tread.

• That sockets and switches are not likely to be operated by unauthorised persons

Question 4

Before any part of the installation is commissioned, when should inspection and if necessary testing be carried out?

• Only on completion of the installation before it is out into service.

• During all stages of erection and before the electrical installation is out into service.

• If circuit protective devices operate upon connection of the supply.

• Before any work can commence and on completion of the installation.

Question 5

Which one of the following sets of regulations is non-statutory?

• Electricity Safety, Quality and Continuity Regulations.

• Electricity at Work Regulations.

• Building Standards Regulations

• BS 7671 Requirements for Electrical Installations

Question 6

Other than within site offices, toilets etc., every plug and socket outlet for use on a construction site shall comply with

• BS EN 60309-2

• BS EN 60947-2

• BS EN 60947-3

• BS EN 60269-1

Question 7

Before testing Circuit Protective Conductors, why must supplementary bonding conductors be removed from a distribution board?

• To eliminate parallel paths which could affect the reading.

• To prevent bonded metal equipment from becoming live during the test.

• To eliminate routes of potential series resistance.

• To reduce the chance of the test affecting the Local Authority?s earthing system.

Question 8

Which of the below are three types of fault that can occur on a single phase system?

• Phase to Earth ? Neutral to Earth ? Earth to Earth.

• Neutral to Neutral ? Neutral to Earth ? Phase to Earth.

• Phase to Earth ? Phase to Neutral ? Neutral to Earth.

• Phase to Phase ? Phase to Neutral ? Phase to Earth.

Question 9

When performing an insulation test on a domestic ring circuit, what level of test voltage would you specify?

• 500 Volts.

• 110 Volts.

• 55 Volts.

• 230 Volts.

Question 10

During an inspection of electrical accessories, which of the below would you check for?

• Is it circuit radial or ring? ? Are the terminals tight.

• The rating of the fuse ? check the circuit is a ring.

• Loose connections ? poor terminations and overheating.

• Are all conductors covered with red sheathing.

Question 11

Before commencing an inspection and test what important information would be required by the electrician performing the task?

• Installation circuit arrangements ? is the supply AC or DC ? Are there any transient loads.

• The owner of the building ? The location of the intake room ? The position of the main supply

• Is the system ALL INSULATED or METAL CLAD ? The Location of the earth electrode ? The cost of the installation.

• Maximum demand ? Nature of supply ? Arrangement of live conductors and type of earthing ? Installation circuit arrangements

Question 12

What is the maximum period between inspection and testing at a petrol filling station?

• 4 months.

• 12 months.

• 4 years.

• 2 years.

Question 13

The part of a fuse which is designed to melt when the fuse operates is defined as the fuse

• wire

• element

• link

• carrier.

Question 14

The reading displayed on the instrument that performs the continuity test of an installation will show the value in:

• Mega-Ohms.

• Volts.

• Milli-Amperes.

• Ohms.

Question 15

What should the warning notice state at the point of connection for all earthing and bonding

• Equipotential Bonding Conductor ? Do Not Remove.

• Earthing Conductor ? Do Not Remove.

• Safety Electrical Connection ? Do Not Remove.

• Supplementary Earthing Connection ? Do Not Remove.

Question 16

Why should electronic equipment be by?passed or disconnected during an insulation test?

• Because they can affect test readings.

• Because they could be damaged by the test voltage.

• Because electronic devices could store a charge, resulting in equipment damage when the mains supply is re-instated.

• Because electronic equipment does not require testing under BS 7671.

Question 17

Which of the below is the correct sequence for electrical tests?

• Insulation 2. Continuity 3. Earth fault loop impedance 4. RCD Tests 5. Polarity.

• RCD Tests 2. Insulation 3. Continuity 4. Earth fault loop impedance 5. Polarity.

• Polarity 2. Continuity 3. Insulation 4. Earth fault loop impedance 5. RCD Tests.

• Continuity 2. Insulation 3. Polarity 4. Earth fault loop impedance 5. RCD Tests.

Question 18

A 13 A socket-outlet, connected directly to a TN-C-S system, supplies portable equipment for use outdoors. Supplementary protection to reduce direct contact risk should be provided by means of a

• BS88 part 2 fuse

• miniature circuit breaker

• residual current device

• class II equipment enclosure

Question 19

What type of installation would require particular attention to the following concerns during an inspection:Is the system robust and mechanically strong?What is the earthing system?Have protective devices been specified correctly taking into account discrimination?Is there any need for under-voltage protection?Has the correct switchgear been selected and been correctly identified?Is there provision for switching off for mechanical maintenance?

• Agricultural.

• Industrial.

• Domestic.

Question 20

During an inspection which of the below should you check for with regard to steel trunking?

• That bonding straps have been fitted across each joint.

• That the earth conductor has been pulled through and terminated.

• That bonding straps have been removed from each joint.

• That the cables insulation has not been damaged throughout its length.

Question 21

To perform the first test of an installation, which of the following instruments would be required?

• Earth continuity tester.

• Component tester.

• Insulation tester.

• Volt meter.

Question 22

During Periodic Inspection and Test in a large commercial installation, which one of the items below should the inspector not be concerned about?

• Will performing the inspection and test result in the disruption of the host business.

• Has the building use altered from its original specification.

• Has the installation altered in any way from its original design?

• A visual inspection should be undertaken of any concealed electrical equipment.

Question 23

What should also be recorded with the test results of an installation Inspection and Test?

• The type of circuit protective device installed.

• The serial numbers of the test instruments used.

• The date the circuit was last tested.

• The insulation resistance of the circuit under test.

Question 24

By law, if you are responsible for an installation, which regulation would you be breaking if you failed to carryout an inspection and test?

• The Electrical Supply Regulations 1989.

• Electricity Installations Regulations 1989.

• Electricity at Work Regulations 1989.

• The IEE Wiring Regulations.

Question 25

What does an earth continuity test verify?

• That the circuit is isolated from the supply.

• The integrity of CPC conductors.

• The integrity of live conductors.

• That the circuit is continuous from the source of the supply to the load.

Question 26

Removing or by passing neon indicators prior to an insulation test is necessary because?

• There is NO need to remove neon indicators.

• They are a sensitive electronic device which could be damaged by the test voltage.

• They have a resistance of 200kOhms which could affect accuracy of readings.

• Neon indicators on control panels could be caused to light by the test voltage causing false alarm readings.

Question 27

No alteration, temporary or permanent, shall be made to an existing installation unless the

• electricity supplier has been informed

• local authority has been informed

• existing equipment is adequate for any additional load

• existing equipment meets BS and BS EN standards

Question 28

Why during electrical testing will the use of an insulation tester introduce a hazard?

• It can interfere with electronic equipment on nearby circuits.

• It can cause fuses to blow.

• It poses no danger.

• It can liven the circuit under test with high voltages.

Question 29

Which one of the following is NOT recognised by BS 7671 as suitable for acting as an earth electrode?

• Non-corrosive metallic coverings of cables.

• Earth plates.

• Underground structural metalwork embedded in foundations

• Gas and water supply pipes

Question 30

Which test verifies that every fuse and single pole protective device is connected in the phase conductor only, centre contact bayonet and Edison Screw lampholders (having an earthed neutral conductor) have the outer screwed connected to the neutral conductor, and that wiring has been correctly connected to socket outlets and similar accessories?

• Insulation Test.

• Continuity Test.

• Polarity Test.

• Earth Fault Loop Impedance Test.

ANSWERS!!!!!

Question 1

If a polarity test identifies that a light switch as been wired in the Phase, what does this mean?

Correct Answer: That the lighting circuit has been correctly installed.

Question 2

If a polarity test identifies that a light switch has been wired in the Neutral, what does this mean?

Correct Answer: That a live voltage will be present at the lamp holder and ceiling rose even if the switch and lamp are off.

Question 3

During an installation inspection, what may need to be concentrated on in an agricultural installation?

Correct Answer: Be aware of possible vermin damage ? that the wiring system is robust enough to survive mechanical impact and varying weather conditions and that RCD?s and earth electrodes have been installed where necessary.

Question 4

Before any part of the installation is commissioned, when should inspection and if necessary testing be carried out?

Correct Answer: During all stages of erection and before the electrical installation is out into service.

Question 5

Which one of the following sets of regulations is non-statutory?

Correct Answer: BS 7671 Requirements for Electrical Installations

Question 6

Other than within site offices, toilets etc., every plug and socket outlet for use on a construction site shall comply with

Correct Answer: BS EN 60309-2

Question 7

Before testing Circuit Protective Conductors, why must supplementary bonding conductors be removed from a distribution board?

Correct Answer: To eliminate parallel paths which could affect the reading.

Question 8

Which of the below are three types of fault that can occur on a single phase system?

Correct Answer: Phase to Earth ? Phase to Neutral ? Neutral to Earth.

Question 9

When performing an insulation test on a domestic ring circuit, what level of test voltage would you specify?

Correct Answer: 500 Volts.

Question 10

During an inspection of electrical accessories, which of the below would you check for?

Correct Answer: Loose connections ? poor terminations and overheating.

Question 11

Before commencing an inspection and test what important information would be required by the electrician performing the task?

Correct Answer: Maximum demand ? Nature of supply ? Arrangement of live conductors and type of earthing ? Installation circuit arrangements

Question 12

What is the maximum period between inspection and testing at a petrol filling station?

Correct Answer: 12 months.

Question 13

The part of a fuse which is designed to melt when the fuse operates is defined as the fuse

Correct Answer: element

Question 14

The reading displayed on the instrument that performs the continuity test of an installation will show the value in:

Correct Answer: Ohms.

Question 15

What should the warning notice state at the point of connection for all earthing and bonding

Correct Answer: Safety Electrical Connection ? Do Not Remove.

Question 16

Why should electronic equipment be by?passed or disconnected during an insulation test?

Correct Answer: Because they could be damaged by the test voltage.

Question 17

Which of the below is the correct sequence for electrical tests?

Correct Answer: Continuity 2. Insulation 3. Polarity 4. Earth fault loop impedance 5. RCD Tests.

Question 18

A 13 A socket-outlet, connected directly to a TN-C-S system, supplies portable equipment for use outdoors. Supplementary protection to reduce direct contact risk should be provided by means of a

Correct Answer: residual current device

Question 19

What type of installation would require particular attention to the following concerns during an inspection:Is the system robust and mechanically strong?What is the earthing system?Have protective devices been specified correctly taking into account discrimination?Is there any need for under-voltage protection?Has the correct switchgear been selected and been correctly identified?Is there provision for switching off for mechanical maintenance?

Correct Answer: Industrial.

Question 20

During an inspection which of the below should you check for with regard to steel trunking?

Correct Answer: That bonding straps have been fitted across each joint.

Question 21

To perform the first test of an installation, which of the following instruments would be required?

Correct Answer: Earth continuity tester.

Question 22

During Periodic Inspection and Test in a large commercial installation, which one of the items below should the inspector not be concerned about?

Correct Answer: A visual inspection should be undertaken of any concealed electrical equipment.

Question 23

What should also be recorded with the test results of an installation Inspection and Test?

Correct Answer: The serial numbers of the test instruments used.

Question 24

By law, if you are responsible for an installation, which regulation would you be breaking if you failed to carryout an inspection and test?

Correct Answer: Electricity at Work Regulations 1989.

Question 25

What does an earth continuity test verify?

Correct Answer: The integrity of CPC conductors.

Question 26

Removing or by passing neon indicators prior to an insulation test is necessary because?

Correct Answer: They have a resistance of 200kOhms which could affect accuracy of readings.

Question 27

No alteration, temporary or permanent, shall be made to an existing installation unless the

Correct Answer: existing equipment is adequate for any additional load

Question 28

Why during electrical testing will the use of an insulation tester introduce a hazard?

Correct Answer: It can liven the circuit under test with high voltages.

Question 29

Which one of the following is NOT recognised by BS 7671 as suitable for acting as an earth electrode?

Correct Answer: Gas and water supply pipes

Question 30

Which test verifies that every fuse and single pole protective device is connected in the phase conductor only, centre contact bayonet and Edison Screw lampholders (having an earthed neutral conductor) have the outer screwed connected to the neutral conductor, and that wiring has been correctly connected to socket outlets and similar accessories?

Correct Answer: Polarity Test.

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