Question 1

3 documents on which the value of PFC should be recorded are?
A) Minor works certificate, Schedule of inspections, Schedule of test results
B) Minor works certificate, condition report schedule of inspections, Condition report schedule of test results
C) Electrical installation certificate, Electrical installation condition report, Generic Schedule of test results
D) Condition report inspection schedule, Electrical installation inspection schedule, Generic schedule of test results

Accepted Answer

The value of PFC (Prospective Fault Current) should be recorded on Electrical installation certificate, Electrical installation condition report and Generic Schedule of test results.

Question 2

Under which condition should a minor works certificate not be issued
A) Addition of a lighting point to an existing circuit
B) Replacement of a one way switch with a dimmer switch
C) Replacement of an existing socket outlet with an RCD protected socket
D) Replacement of a circuit breaker with an RCBO

Accepted Answer

A minor works certificate should not be issued for the replacement of a circuit breaker with an RCBO as this would involve altering the protective device and should be done by a qualified electrician who should issue an electrical installation certificate instead.

Question 3

One statutory and two non statutory documents relating to the inspection and testing process for an electrical installation are?
A) GS 38, BS 7671 and GN3
B) EAWR 1989, HASWA 1974, GS 38
C) ESQCR 2002, EAWR 1989, BS7671
D) EAWR 1989, BS7671, GN3

Accepted Answer

EAWR 1989 and BS7671 are statutory documents that set out the legal requirements for the inspection and testing of electrical installations. GN3 is a non-statutory guidance document that provides practical advice on how to carry out the inspection and testing process. ESQCR 2002 is not directly related to the inspection and testing process, but rather sets out safety requirements for the design, construction and operation of electrical systems in certain high-risk locations.

Question 4

The human sense which would be most suitable for identifying an overloaded electric motor would be
A) Smell
B) Sight
C) Touch
D) Hearing

Accepted Answer

The smell of burning insulation is a common sign of an overloaded electric motor.

Question 5

A periodic inspection is to be carried out on the electrical installation in a shoe shop, what must be agreed with the client and recorded on the electrical installation condition report?
A) The cost of the work to be carried out
B) The duration of the work
C) Extent and limitations
D) Number of people carrying out the inspection

Accepted Answer

The extent and limitations of the inspection must be agreed with the client and recorded on the electrical installation condition report, as this will ensure that both the client and the inspector have a clear understanding of the scope of the inspection. The cost of the work, duration of the work, and number of people carrying out the inspection may be discussed separately but are not directly related to the extent and limitations of the periodic inspection.

Question 6

Two methods which can be used to carry out continuity of circuit protective conductors which are not completely visible are
A) Method 1 (R1 + R2), and method 2 (long lead)
B) Visual inspection and long lead method
C) Method 1 and method 3
D) Visual and R1 + R2 method

Accepted Answer

Method 1 (R1 + R2) and Method 2 (long lead) are commonly used methods to carry out continuity of circuit protective conductors which are not completely visible.

Visual inspection alone may not be sufficient to determine the continuity of circuit protective conductors as they may be concealed by insulation or other building components. Method 3 is not a commonly used method for continuity testing.

Question 7

One consideration regarding test leads when carrying out a ring circuit test is
A) Leads comply with GS 38
B) The leads must be nulled or the resistance subtracted from the test result
C) Leads must be correctly coloured
D) They must be manufactured by the same company as the test instrument

Accepted Answer

When carrying out a ring circuit test, it is important to null the resistance of the test leads or subtract it from the test results to ensure accurate readings. Compliance with GS 38 and correct colouring of the leads are also important considerations, but they are not specifically related to the ring circuit test. The manufacturer of the test leads is not necessarily important as long as they are of good quality and suitable for the testing equipment.

Question 8

When conducting an earth fault loop impedance test on a final circuit
A) The leads must be nulled
B) The installation must be isolated and the earthing conductor disconnected
C) The earthing conductor must be disconnected and the installation energised
D) The earthing conductor must be connected and the circuit energised

Accepted Answer

The earth fault loop impedance test requires the circuit to be energized and the earthing conductor to be connected to ensure accurate measurement of the impedance in the fault loop path.

Question 9

Three checks which must be carried out on an electrical installation before an installation resistance test is carried out on it are
A) Installation isolated, lamps removed, switches open
B) Lamps removed, installation energised and dimmers bypassed
C) Installation energised, all lamps in place and switches closed
D) Switches closed, installation isolated and lamps removed

Accepted Answer

Before conducting an installation resistance test, it is important to ensure that the installation is isolated to avoid electric shock. Also, all lamps must be removed from the sockets to prevent any interference with the test results. Finally, switches must be opened to ensure that no electrical current passes through the circuit being tested. This makes option D the best choice as it includes all three necessary checks.

Question 10

When carrying out a ring final circuit test the measured value of stages 2 and 3 are lower than the measured value of stage 1 because
A) The conductors are connected in parallel
B) The conductors are disconnected
C) The conductors are incorrectly connected
D) The cpc and the line conductors are the same size

Accepted Answer

The ring final circuit consists of two parallel-connected conductors, and therefore the measurement of stages 2 and 3 will be lower than the measurement of stage 1 due to the characteristics of parallel circuits.

Question 11

r2 is sometimes proportionally higher than r1 and rn because
A) It is longer
B) It has a larger cross sectional area
C) It has a smaller cross sectional area
D) It has been connected into the wrong terminal

Accepted Answer

R2 can be proportionally higher than R1 and Rn if it has a smaller cross-sectional area. This is because resistance is inversely proportional to the cross-sectional area of the conductor, according to the formula R = ρL/A, where R is resistance, ρ is the resistivity of the material, L is the length of the conductor, and A is its cross-sectional area.

Question 12

The best method of carrying out an insulation test on a circuit containing a dimmer switch which cannot be removed is to
A) Turn the switch off
B) Test between live conductors only
C) Carry out the test using a low resistance ohmmeter
D) Test between live conductors joined and earth

Accepted Answer

Testing between live conductors joined and earth will allow for the measurement of the insulation resistance of the circuit while also taking into account the presence of the dimmer switch. This method ensures that the entire circuit is being tested, including any potential leakage paths through the switch. Testing between live conductors only or using a low resistance ohmmeter could result in misleading or inaccurate readings. Turning the switch off is not necessary for this type of test.

Question 13

IPXXB is the IP code for
A) A 12.5mm diameter hole
B) Standard finger protection
C) A 1mm diameter hole
D) Protection from ingress of dust

Accepted Answer

IPXXB refers to protection against access with a finger, which is standard finger protection.

Question 14

When an IP code contains an X as the second number is means that
A) The hole must be completely blocked up
B) Nothing is specified for dust
C) Nothing is specified for liquids
D) It is waterproof

Accepted Answer

An "X" as the second number in an IP code indicates that no specific protection level is defined for liquids.

Question 15

When conducting a polarity test on a lighting circuit, it must be verified that
A) The switch is in the line conductor
B) The switch line is correctly identified
C) The switch is the right way up
D) The correct rating of protective device has been used

Accepted Answer

The polarity test ensures that the switch is connected to the line conductor, which is crucial for safety and proper circuit operation.

Question 16

Where a 300mA rcd to BS EN 61008 has been used for fire protection the following sequence of tests must be carried out to prove its correct operation
A) x1/2 x1 and x5
B) 150mA, 300mA and 1500mA
C) Operate the test button, 150mA and 300mA
D) 150mA, 300mA, operate the test button

Accepted Answer

The answer of Where a 300mA rcd to BS EN...

Question 17

The maximum test current to be applied to a 100 mA rcd when it is being tested is
A) 0.1A
B) 0.01A
C) 500mA
D) 50mA

Accepted Answer

The maximum test current for an RCD is typically 50% of its rated tripping current. Therefore, for a 100 mA RCD, the maximum test current would be 50 mA.

Question 18

The most suitable test instrument used to carry out a test on an earth electrode which is to be used for a generator is
A) An earth fault loop impedance tester
B) A high current tester
C) A low resistance ohmmeter
D) An earth electrode tester

Accepted Answer

An earth electrode tester is specifically designed to test earth electrodes, including those used for generators, to ensure they are properly grounded and meet safety standards.

Question 19

The recommended frequency for the inspection of privately owned domestic accommodation as given in GN3 is
A) 5 years
B) 10 years
C) 3 years
D) 7 years

Accepted Answer

GN3 recommends that the inspection of privately owned domestic accommodation should be carried out every 10 years.

Quiz 4: Periodic Testing

3 documents on which the value of PFC should be recorded are?

Under which condition should a minor works certificate not be issued

One statutory and two non statutory documents relating to the inspection and testing process for an electrical installation are?

The human sense which would be most suitable for identifying an overloaded electric motor would be

A periodic inspection is to be carried out on the electrical installation in a shoe shop, what must be agreed with the client and recorded on the electrical installation condition report?

Two methods which can be used to carry out continuity of circuit protective conductors which are not completely visible are

One consideration regarding test leads when carrying out a ring circuit test is

When conducting an earth fault loop impedance test on a final circuit

Three checks which must be carried out on an electrical installation before an installation resistance test is carried out on it are

When carrying out a ring final circuit test the measured value of stages 2 and 3 are lower than the measured value of stage 1 because

r2 is sometimes proportionally higher than r1 and rn because

The best method of carrying out an insulation test on a circuit containing a dimmer switch which cannot be removed is to

IPXXB is the IP code for

When an IP code contains an X as the second number is means that

When conducting a polarity test on a lighting circuit, it must be verified that

Where a 300mA rcd to BS EN 61008 has been used for fire protection the following sequence of tests must be carried out to prove its correct operation

The maximum test current to be applied to a 100 mA rcd when it is being tested is

The most suitable test instrument used to carry out a test on an earth electrode which is to be used for a generator is

The recommended frequency for the inspection of privately owned domestic accommodation as given in GN3 is