Inspection and Testing - 30Q mock (closed-book - no notes or Regs books to be used). Questions to BS7671:2018 (amendment 3:2024)

When a certificate is issued for Initial Verification purposes, for the certificate to be valid it MUST be accompanied by?
1. test results sheet
2. inspection tick-sheet
3. schedules of inspections and test results
4. Part 'P' certificate
When the installation of a new circuit to an existing installation has been completed, the inspector will issue?
1. an initial verification certificate
2. a minor-works certificate
3. a condition report
4. a schedule of the tests completed
An electrical installation certificate for a new installation will require THREE signatories, Identify one of these signatories.
1. the owner
2. the site manager
3. the designer
4. the local authority
An electrical installation certificate for a new installation will require THREE signatories, Identify one of these signatories.
1. the owner
2. the clerk-of-works
3. the constructor
4. the local council
An electrical installation certificate for a new installation will require THREE signatories, Identify one of these signatories.
1. the customer
2. the clerk-of-works
3. the inspector/tester
4. building control
Which of the human senses would be used to determine that a BS3036 device has operated?
1. touch
2. smell
3. sight
4. hearing
Which (preferred) human sense would be used to determine that a cable is being exposed to over-current?
1. sight
2. smell
3. touch
4. hearing
Which (preferred) human sense would be used to determine that an item of sealed equipment under test is arcing internally whilst energised'?
1. taste
2. touch
3. sight
4. hearing
identify the indication to be used on an Initial Verification Schedule of Inspection form to indicate that an item meets the requirements of BS7671
1. a cross (x)
2. a tick
3. N/A
4. Lim
identify the indication to be used on an Initial Verification Schedule of Inspection form to indicate that an item is not applicable for this particular installation
1. a cross (x)
2. a tick
3. N/A
4. Lim
An electrical installation is afforded 'short-circuit protection' by the use of ADS. When inspecting this method of protection, which one of the following checks is not applicable?
1. bonding conductor continuity
2. Zs test
3. continuity of c.p.c's
4. inspection of fire barriers
Supplementary bonding conductors that are protected against mechanical damage shall have a CSA no smaller than?
1. 10 sqmm
2. 6 sqmm
3. 4 sqmm
4. 2.5 sqmm
Supplementary bonding conductors that are not protected against mechanical damage shall have a CSA no smaller than?
1. 10 sqmm
2. 6 sqmm
3. 2.5 sqmm
4. 4 sqmm
State the effect of running a separate copper conductor connected at each end in parallel with the steel-wire-armour of a SWA, for its entire length.
1. overall (R1+R2) value for the circuit would increase
2. overall (R1+R2) value for the circuit would decrease
3. disconnection times would increase
4. there would be no effect
State the effect of re-siting a consumers unit (CCU) further away from the mains intake position.
1. The Ze value measured at the CCU would increase
2. The volts-drop at the CCU would remain constant
3. Volts-drop at the CCU would decrease
4. Prospective Fault current at the CCU would increase
In a location containing a bath, identify the position of Zone 0?
1. in the bathtub
2. 0.6m from the bathtub
3. immediately above the bathtub
4. 3m or beyond
In a room containing a bath, state the distance beyond which, 13A socket-outlets MAY be installed.
1. 0.6m
2. 1.5m
3. 2.5m
4. 3m
Identify the non-statutory document that details the construction and safe use of electrical test instruments and equipment.
1. Electricity at Work regulations
2. BS7671 On-site guide
3. HSE guidance note GS38
4. Electrical Regulations book
State the overall effect on Insulation Resistance if twice as many circuits are added to an existing consumers unit (CCU).
1. Insulation Resistance would increase
2. Insulation Resistance would decrease
3. Insulation Resistance would remain the same
4. Insulation Resistance would be be 200M Ohms
Before carrying out an Insulation Test at an occupied premises, which one of the following actions would be required to ensure safety?
1. inform 'building control' prior to testing
2. inform all persons present and erect warning signs
3. tell the client what's happening
4. keep all access points to the building locked
Identify the result below that would indicate that a SELV circuit has passed an Insulation Resistance test.
1. minimum 0.25 M ohms at 500v dc
2. minimum 0.5 M ohms at 250v dc
3. minimum 1 M ohms at 250v dc
4. minimum 0.5 M ohms at 500v dc
Identify the result below that would indicate that a 230v ac circuit has passed an Insulation Resistance test.
1. minimum 1 M ohms at 500v dc
2. minimum 0.5 M ohms at 250v dc
3. minimum 0.25 M ohms at 250v dc
4. minimum 2 M ohms at 500v dc
In an installation where more than one RCD device has been installed in series, to ensure that the correct downstream device operates during a fault, there must be ....... between devices (identify the missing term).
1. determination
2. discrimination
3. disassociation
4. dissertation
A test for the prospective short-circuit current is measured at the mains intake position to ensure that...
1. the main protective device is rated at a value higher than the measured value
2. any fault current is sufficient to disconnect the mcb's in 0.4s or quicker
3. it does not exceed 6kA
4. circuit currents are not too high
Continuity of protective conductors (R2) tests are carried out using
1. an insulation resistance tester
2. a continuity tester
3. a low ohms meter
4. a volt meter
if two conductors, both with a resistance of 1 ohm each are connected together in parallel, calculate the total resistance.
1. 2 ohms
2. 1 ohm
3. 0.5 ohms
4. 3 ohms
On a continuity of ring circuit conductors test, state the purpose of taking test readings at socket outlets once the incoming and outgoing lines and cpcs have been cross-linked in the CCU.
1. to record the (R1+R2) value
2. to prove the circuit is a ring
3. to ensure that the live is continuous
4. to ensure the cpc is continuous
Identify the unit of measure for an insulation test
1. m ohms
2. M ohms
3. ohms
4. k ohms
A circuit has a 32A type 'B' circuit breaker which has a maximum tabulated value of 1.37 ohms. State the maximum measured value of Zs allowed for this circuit.
1. 1.10 ohms
2. 1.44 ohms
3. 0.72 ohms
4. 1 ohm
An A1 ring circuit records open-end continuity of 0.8 ohms (L) and 1.3 ohms (cpc), calculate the expected value of (R1+R2) for that ring circuit.
1. 0.53 ohms
2. 2.1 ohms
3. 1.63 ohms
4. 13.85 ohms
Before carrying out an Insulation Resistance test on a lighting circuit, is is essential to...
1. link the line and cpc in the CCU
2. remove all loads from the circuit
3. disconnect the earthing conductor
4. ensure all light switches are in the off position
For a non-delay RCD type used for additional protection, effectiveness is deemed to have been verified if the RCD is tested at IΔn and disconnects within
1. 300mS max
2. 200mS max
3. 150mS max
4. 500mS max
State the maximum test current that would be applied to a 100mA RCD during RCD testing at IΔn.
1. 100mA
2. 150mA
3. 30mA
4. 15mA
Where is a live polarity check carried out to verify that the supply to an installation is correct?
1. at the mains intake position
2. at the end of any installed circuit
3. at the end of every circuit
4. at any socket outlet
The current measured at the mains intake position of an installation would be recorded on test documentation as the?
1. design current
2. prospective fault current
3. tabulated current
4. protective device current
An installed circuit has a Zs value of 0.84 ohms. If Ze = 0.04 ohms, calculate the value of (R1+R2)
1. 0.8 ohms
2. 0.88 ohms
3. 0.34 ohms
4. 2.1 ohms
An installed circuit has a Zs value of 0.84 ohms. If (R1+R2) = 0.5 ohms, calculate the value of Ze
1. 1.34 ohms
2. 1.68 ohms
3. 0.34 ohms
4. 2.2 ohms
A circuit has a supply voltage between L and E = 230v at 50Hz AC, an (R1+R2) value = 0.24 ohms and a Ze value = 0.8 ohms. Calculate the Ipscc value for the circuit.
1. 221A
2. 230.8A
3. 3.48 mA
4. 288A
State the maximum disconnection time for a type AC time-delayed RCD rated at 30mA and tested at IΔn?
1. 40mS
2. 300mS
3. 500mS
4. it should not trip
Identify the unit of measure used on an RCD tester?
1. M ohms
2. milli ohms
3. mS
4. low ohms
Identify the unit of measure for a PFC instrument?
1. kA
2. mA
3. mS
4. M ohms
Identify the type of instrument that would be used to measure leakage current in a circuit.
1. voltmeter
2. clamp meter
3. Ipscc tester
4. EFLI tester
A circuit has a supply voltage between L and E = 230v at 50Hz AC, an (R1+R2) value = 0.24 ohms and a Zs value = 0.8 ohms. Calculate the Ipscc value that would be recorded at the installation mains-intake position.
1. 411A
2. 230.8A
3. 3.48 mA
4. 229A
Identify the correct document to be completed when an additional socket has been added to an A1 ring circuit
1. Electrical Installation Condition report
2. schedule of test results sheet
3. minor electrical installation works certificate
4. Electrical Installation Certificate
Identify which item of information is NOT included on a Minor Electrical Installation Works Certificate
1. details of departures from BS7671
2. Earth Fault Loop Impedance (Zs)
3. External Impedance (Ze)
4. Satisfactory RCD test button operation
Identify the reading that would be recorded on the electrical installation certificate if the prospective fault current (Ipfc) was measured between line to earth and line to neutral for a single-phase electrical installation
1. the highest of the two values
2. Twice the line to earth value
3. Twice the line to neutral value
4. the lowest of the two values
Electrical testing is to be carried out at the origin of a large, unoccupied building which has a standby generator.
What must be done before testing begins
1. All main protective bonding needs to be disconnected
2. The standby generator must be isolated to ensure safety during testing
3. Check the operation of the standby generator
4. The mains incoming supply must be isolated
Identify the test that does not apply to an electrical installation connected to a TN-S supply system
1. Earth fault loop impedance
2. Earth electrode resistance
3. Insulation resistance
4. RCD functional tests
Identify the test that could also indicate the mains supply polarity
1. External earth fault loop impedance
2. Continuity of protective conductors.
3. Insulation resistance.
4. RCD functional test.
Identify the effect on the insulation resistance of cable, when its length is doubled, if the original value is 5 MΩ
1. it will remain at 5MΩ
2. it will increase to 10MΩ
3. it will reduce to 2.5MΩ
4. it will reduce to 1.25MΩ

Inspection and Testing - 30Q mock (closed-book - no notes or Regs books to be used). Questions to BS7671:2018 (amendment 3:2024)

Inspection and Testing to BS7671:2018 (amendment 3:2024). 30 randomised questions from a LARGE question bank.