Periodic Inspection and Testing – Quiz 1
Periodic Inspection Knowledge Check
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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?
A visual inspection of the wiring and condition of the accessories.
Certification of the additional wiring on completion of the extension.
A full review of the original electrical installation certificate.
A periodic inspection and test of the existing installation.
What is the purpose of a periodic inspection and test relating to the safety of the building?
There is no risk of electric shock and burns.
That the electrical installation is not damaged.
That there are no defects or non-compliances present.
There is no risk of fire caused by the electrical installation.
What is the minimum level of IP protection for the accessible top surface of a consumer unit?
IPX4
IP2X
IP4X
IPX2
Which publication gives detailed information for carrying out testing of electrical installations?
IET Guidance Note 3
IET Guidance note 1
HSE GS 38
HS(G)141
What would be agreed with the client and recorded as a limitation for a periodic inspection and test?
No insulation resistance testing between live conductors to be carried out.
The installation can be isolated and a full range of tests to be carried out.
The finalised report is to be provided to the client electronically.
Only calibrated test instruments are to be used.
Which statutory document includes the requirements for working on live conductors?
The Electricity at Work Regulations.
The Electricity Safety Quality and Continuity Regulations.
The Construction (Design and Management) Regulations.
The Health and Safety at Work Act.
What action should the inspector take, both before and after testing, to confirm isolation of the supply?
Switch the main isolator on and off.
Lock the main switch on the open position.
Confirm the operation of the approved voltage indicator.
Attach a warning label at the isolator stating ‘do not switch on’.
Which classification code indicates that there is a non-compliance which is identified as ‘improvement recommended’?
C2
C1
C3
C5
Which human senses would be best used to determine excess arcing at a contactor during a walk around survey?
Hearing and smell.
Touch and smell.
Smell and sight.
Sight and hearing.
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?
Poor performance of connected equipment.
Possible loss of computer data.
Electric shock from different potentials.
Tripping hazards from the test method.
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?
To confirm there is a low earth return path for fault current.
To confirm exposed conductive parts are connected to the MET.
To confirm that a high current will flow in the event of an earth fault.
To confirm extraneous conductive parts are connected to the MET.
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?
Leads have a 3 mm exposed tip.
Leads are a minimum 10 mm2.
Leads are nulled or zeroed.
Leads are fitted with finger guards.
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?
Earth fault loop impedance.
Linked R1 + R2 test.
Long lead test.
Zs – Ze.
A 10 mm2 main protective bonding conductor is 37.5 m in length. What is the expected measured resistance when testing the conductor?
0.07 Ω
6.86 Ω
0.08 Ω
0.70 Ω
What is the most likely cause of the measured value being much higher than the calculated value?
Heavy load on the installation
Leakage current from computer equipment.
Higher than normal ambient temperature.
Failure to null the test leads.
An earth fault loop impedance test is to be carried out on a radial circuit to the local isolator, as shown in figure 4. Why can this earth fault loop impedance test be carried out before a test for insulation resistance?
To maximise inconvenience for the users of the installation.
Dead tests are not required at a periodic inspection and test.
Because the installation is already energised and in service.
The test will confirm there is no degradation of the insulation.
An earth fault loop impedance test is to be carried out on a radial circuit to the local isolator, as shown in figure 4. Why do the test leads used for this test have to comply with GS 38?
GS 38 is a statutory document.
Continuity can be proved during insulation resistance testing.
Dead tests are not required at a periodic inspection and test.
Dead tests are not required at a periodic inspection and test.
A distribution circuit is protected by a BS 88-3 fuse rated 32 A. What is the maximum acceptable measured earth fault loop impedance for this circuit?
1.25 Ω
1.60 Ω
1.60 Ω
1.60 Ω
What is confirmed by an earth fault loop impedance test on a radial power circuit?
The line and cpc conductors are the right csa.
Automatic disconnection of supply will be achieved in the event of a fault.
Fault protection is provided for the whole installation.
The circuit breaker can disconnect the maximum prospective fault current.