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Question 1 of 10
1. Question
In which particular position an inspector will be expected to examine an RCD, not in excess of 500mA?
Correct
The only special position in BS 7671 where there is an RCD not exceeding 500mA Construction and demolition site installation is to provide security for circuits supplying one or more socket-outlets with rated current above 32A.
Incorrect
The only special position in BS 7671 where there is an RCD not exceeding 500mA Construction and demolition site installation is to provide security for circuits supplying one or more socket-outlets with rated current above 32A.
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Question 2 of 10
2. Question
The inspector wants to isolate the final circuit safely, but another individual has isolated and locked the circuit. What action should the inspector get?
Correct
Ideally, the other person working on the circuit should have left a name and contact number on his/her warning and arranged for the multi-locking off hasp to be fitted with the safety locks of both parties. If this procedure cannot be carried out, double locking and confirming the isolation of the circuit should be carried out.
Incorrect
Ideally, the other person working on the circuit should have left a name and contact number on his/her warning and arranged for the multi-locking off hasp to be fitted with the safety locks of both parties. If this procedure cannot be carried out, double locking and confirming the isolation of the circuit should be carried out.
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Question 3 of 10
3. Question
Inherently, electrical testing entails some degree of danger; thus, the inspector has a duty of care to take sufficient measures to protect not only his or her own protection but that of others. To achieve this aim, which non-statutory document provides safety procedures?
Correct
The primary consideration when testing either an individual circuit or the entire installation should be the safe insulation, then checking to ensure that the circuit/installation is dead with the appropriate instrument, which must comply with the standard required by GS 38, before considering any further action.
Incorrect
The primary consideration when testing either an individual circuit or the entire installation should be the safe insulation, then checking to ensure that the circuit/installation is dead with the appropriate instrument, which must comply with the standard required by GS 38, before considering any further action.
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Question 4 of 10
4. Question
The inspector is to perform an external Earth Defect Loop Impedance (Ze) test. Before conducting the test, the inspector should ensure that the test probe of the instrument meets the requirements of GS38; which statement confirms compliance?
Correct
External Earth Defect Loop Impedance (Ze) is a live test that can be hazardous. It also carries a risk element, therefore, finger guards are essential to protect the inspector from inadvertently touching a live conductor. In addition, the exposed metal tips of the probes should not exceed 4 mm and should be protected with a 10A fuse.
Incorrect
External Earth Defect Loop Impedance (Ze) is a live test that can be hazardous. It also carries a risk element, therefore, finger guards are essential to protect the inspector from inadvertently touching a live conductor. In addition, the exposed metal tips of the probes should not exceed 4 mm and should be protected with a 10A fuse.
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Question 5 of 10
5. Question
State the course of action to be taken by the inspector to determine the voltage drop of the radial power circuit during initial verification.
Correct
Normally, the inspector is not required to determine the voltage drop of the circuit when conducting the initial verification; the designer’s criteria would provide this information.
Incorrect
Normally, the inspector is not required to determine the voltage drop of the circuit when conducting the initial verification; the designer’s criteria would provide this information.
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Question 6 of 10
6. Question
The test sequence for periodic inspection and initial verification may differ, but under what circumstances must the test sequence for the two test methods follow the test sequence set out in BS 7671?
Correct
Allowing an electrical installation to be operational without initial testing would place the owner of the installation in a precarious legal position, inasmuch as the owner would be in contravention of the statutory provisions, i.e., the Electricity at Work Regulations 1989.
Incorrect
Allowing an electrical installation to be operational without initial testing would place the owner of the installation in a precarious legal position, inasmuch as the owner would be in contravention of the statutory provisions, i.e., the Electricity at Work Regulations 1989.
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Question 7 of 10
7. Question
What does the inspector do with the principal earthing conductor when calculating the external earth fault loop impedance (Ze) and the explanation why?
Correct
Parallel earth return paths, which can be attributed to external conductive or other metallic parts within the installation, may give rise to misleading test results and cast doubt on the reliability of the fault path.
Incorrect
Parallel earth return paths, which can be attributed to external conductive or other metallic parts within the installation, may give rise to misleading test results and cast doubt on the reliability of the fault path.
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Question 8 of 10
8. Question
What can the inspector do with the main earthing conductor when measuring the potential earth defect current state and explaining why?
Correct
A fairly straightforward response, simply because when the installation is done It is energized, and if a fault current is generated, the conductor of the earth will be energized. Connected; therefore, the inspector needs to know what the actual prospective currents are to ensure that the protection device of the final circuit can operate safely under fault conditions. Any parallel paths should be included.
Incorrect
A fairly straightforward response, simply because when the installation is done It is energized, and if a fault current is generated, the conductor of the earth will be energized. Connected; therefore, the inspector needs to know what the actual prospective currents are to ensure that the protection device of the final circuit can operate safely under fault conditions. Any parallel paths should be included.
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Question 9 of 10
9. Question
When measuring a potential earth fault current state what the inspector should do with the main earthing conductor and why.
Correct
A fairly straightforward response, simply because when the installation is done It is energized, and if a fault current is generated, the conductor of the earth will be energized. Connected; therefore, the inspector needs to know what the actual prospective currents are to ensure that the protection device of the final circuit can operate safely under fault conditions. Any parallel paths should be included.
Incorrect
A fairly straightforward response, simply because when the installation is done It is energized, and if a fault current is generated, the conductor of the earth will be energized. Connected; therefore, the inspector needs to know what the actual prospective currents are to ensure that the protection device of the final circuit can operate safely under fault conditions. Any parallel paths should be included.
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Question 10 of 10
10. Question
The potential fault current (Ipf) should be measured at each relevant point in the installation. Under what circumstances is this not necessary?
Correct
Provided that the Icn protection device is not exceeded at the origin of the installation and that the Icn value of each protective device is the same throughout the system, it will be an unnecessary exercise to measure the potential current fault at each relevant point because the downstream impedance will increase from the origin, therefore, the potential current will decrease proportionally.
Incorrect
Provided that the Icn protection device is not exceeded at the origin of the installation and that the Icn value of each protective device is the same throughout the system, it will be an unnecessary exercise to measure the potential current fault at each relevant point because the downstream impedance will increase from the origin, therefore, the potential current will decrease proportionally.