Question 1

What is the status of the person who is carrying out an inspection and test
A) Duty holder
B) Electrician
C) Competent
D) Qualified

Accepted Answer

A

Question 2

Which of the following documents is non statutory
A) Electricity at work regulations 1989
B) Health and safety at work regulations 1974
C) Electrical safety quality and continuity regulations 2002
D) GS 38

Accepted Answer

GS 38 is a guidance document and not a statutory regulation. The other options listed are all statutory regulations relating to health and safety in the workplace.

Question 3

The correct document required when an electrical installation has been overloaded is
A) An electrical installation certificate
B) A minor works certificate
C) An electrical installation condition report
D) A periodic inspection report

Accepted Answer

D

Question 4

A periodic inspection need not be carried out when
A) It is too expensive
B) Regular documented maintenance is carried out
C) The due date has expired
D) The installation is more than 10 years old

Accepted Answer

Regular documented maintenance is carried out, which ensures that the installation is being regularly checked and serviced. Therefore, a periodic inspection may not necessarily be needed. It is important to note, however, that regular maintenance does not replace the need for periodic inspections entirely, and they should still be carried out at the required intervals.

Question 5

A low resistance ohmmeter must produce a voltage of
A) 50v
B) 500v
C) 2 - 24v
D) 2 - 24mV

Accepted Answer

A low resistance ohmmeter typically produces a voltage in the range of 2 to 24 volts to accurately measure low resistance values without causing significant current flow that could potentially damage the component being tested or affect the accuracy of the measurement.

Question 6

A test instrument which could be used to measure the resistance of an earth electrode is
A) A low resistance ohm meter
B) An earth fault loop impedance tester
C) A prospective short circuit current tester
D) An insulation resistance tester

Accepted Answer

An earth fault loop impedance tester is specifically designed to measure the resistance of an earth electrode by evaluating the impedance of the earth fault loop path.

Question 7

Why is it important that the tests carried out during an initial verification carried out in the correct order
A) To save time
B) To avoid excessive battery use
C) Safety
D) It is easy to remember

Accepted Answer

Carrying out tests in the correct order is important for ensuring safety. If steps are skipped or performed out of order, it could lead to dangerous situations, such as energized circuits or errors in the equipment. Safety should always take top priority.

Question 8

The calculation for circuit earth fault loop impedance is
A) Zs = Ze + R1 + R2
B) Ze = Zs - R1 + R2
C) Zs = Ze + R1 + Rn
D) Ze = Zs + R1 + R2

Accepted Answer

The formula for circuit earth fault loop impedance is Zs = Ze + R1 + R2. This is because the circuit impedance (Zs) is equal to the sum of the earth fault loop impedance (Ze) and the resistance of the line conductor (R1) and the protective conductor (R2).

Question 9

A conductor which is 36 m long has a resistance of 7.41mΩ per meter calculate its end to end resistance
A) 0.26mΩ
B) 2.66Ω
C) 0.26Ω
D) 2.66mΩ

Accepted Answer

The end-to-end resistance of the conductor can be calculated as:
Total resistance = Resistance per meter x Length
Total resistance = 7.41 mΩ/m x 36 m 
Total resistance = 266.76 mΩ 
Converting to Ω: 
Total resistance = 0.26676 Ω 
Therefore, the correct choice is C) 0.26Ω, which is the nearest option in terms of significant figures.

Question 10

The circuits in an installation have an insulation resistance of 20MΩ, 34MΩ 18MΩ and 20MΩ if the insulation resistance was measured from the meter tails the expected insulation resistance would be
A) 5.40MΩ
B) 546MΩ
C) 5.46Ω
D) 5.46mΩ

Accepted Answer

When measuring the insulation resistance of multiple circuits together, the overall resistance is lower than the individual resistances due to the parallel combination of resistances. The formula for total resistance $R_t$ in parallel is given by $\frac{1}{R_t} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3} + \frac{1}{R_4}$. Using the given resistances, $\frac{1}{R_t} = \frac{1}{20} + \frac{1}{34} + \frac{1}{18} + \frac{1}{20}$ MΩ, which calculates to an $R_t$ of approximately 5.40MΩ.

Question 11

The test which must be carried out prior to the RCD test during a periodic inspection is
A) Push button test
B) Prospective short circuit current
C) Earth fault loop impedance
D) Insulation resistance

Accepted Answer

The correct test to be carried out prior to the RCD test during a periodic inspection is the Earth Fault Loop Impedance test. This test checks if the electrical circuit's protective device will operate within the required time to protect against electric shock.

Question 12

The tests currents required when testing a 300mA RCD are
A) 150mA, 300mA and 1500mA
B) 15mA, 30mA and 150mA
C) 0.15A, 0.3A
D) 0.015A 0.030A

Accepted Answer

The answer of The tests currents required when testing a...

Question 13

The first three tests required for an initial verification are
A) Polarity, Insulation resistance and earth fault loop
B) Continuity of protective conductors, polarity and insulation resistance
C) Ring final circuit test, insulation resistance and earth fault loop impedance
D) Continuity of protective conductors, ring final circuit test and insulation resistance

Accepted Answer

The answer of The first three tests required for an...

Question 14

The maximum rating of an RCD used for fire protection is
A) 300mA
B) Time delayed 300mA
C) Time delayed 30mA
D) 500mA

Accepted Answer

The maximum rating of an RCD (Residual Current Device) used for fire protection is 300mA. This is because a 300mA RCD is sensitive enough to detect most fault currents that could cause a fire without being so sensitive that it trips unnecessarily for minor, non-hazardous leaks.

Question 15

The correct IP rating for equipment installed in Zone 2 of a bathroom is
A) IP4X
B) IPXXB
C) IPX4
D) IPX2

Accepted Answer

The correct IP rating for equipment installed in Zone 2 of a bathroom is IPX4, as this rating indicates that the equipment is protected against splashing water from any direction. IP4X (A) indicates protection against solid objects greater than 1mm in diameter and is not relevant in this context. IPXXB (B) is not a valid IP rating. IPX2 (D) indicates protection against dripping water when tilted up to 15 degrees and is not sufficient for use in Zone 2 of a bathroom.

Question 16

The IP rating used to indicate finger protection is
A) IP2X
B) IPXXB
C) IP4X
D) IPXXD

Accepted Answer

The answer of The IP rating used to indicate finger...

Question 17

The current which should cause automatic disconnection of a 20a type B BS EN 60898 circuit breaker is
A) 100A
B) 200A
C) 100mA
D) 21A

Accepted Answer

Type B circuit breakers are designed to trip between 3 to 5 times their rated current, so for a 20A breaker, it should trip at 100A (5 times 20A).

Question 18

The stated maximum Ze for a TN-S supply system is
A) 0.35Ω
B) 0.21Ω
C) 0.8Ω
D) 0.85Ω

Accepted Answer

The answer of The stated maximum Ze for a TN-S...

Question 19

A TT system is normally an
A) Overhead supply
B) Underground supply
C) Generator supply
D) A top to tail supply

Accepted Answer

A TT system is a type of electrical supply in which the transformer at the supplier's substation serves a single customer or group of customers. This is typically done through an overhead supply, as underground supplies can be more expensive and difficult to install. Generator supplies may be used for backup power, but are not typically part of a TT system. "Top to tail" is not a term used in the context of electrical supply.

Question 20

Ipf is the symbol used for the value of
A) Current power factor
B) Current, power and frequency
C) Frequency of phase current
D) Prospective fault current

Accepted Answer

IPF stands for prospective fault current, which is the maximum current that could flow in a circuit in the event of a fault. It is a crucial parameter in designing electrical equipment and determining the protective devices needed to safeguard the system against overcurrents. The other options listed do not match the meaning of the IPF symbol.

Quiz 2: Types of Certiﬁcation Required for the Inspecting and Testing of Electrical

What is the status of the person who is carrying out an inspection and test

Which of the following documents is non statutory

The correct document required when an electrical installation has been overloaded is

A periodic inspection need not be carried out when

A low resistance ohmmeter must produce a voltage of

A test instrument which could be used to measure the resistance of an earth electrode is

Why is it important that the tests carried out during an initial verification carried out in the correct order

The calculation for circuit earth fault loop impedance is

A conductor which is 36 m long has a resistance of 7.41mΩ per meter calculate its end to end resistance

The circuits in an installation have an insulation resistance of 20MΩ, 34MΩ 18MΩ and 20MΩ if the insulation resistance was measured from the meter tails the expected insulation resistance would be

The test which must be carried out prior to the RCD test during a periodic inspection is

The tests currents required when testing a 300mA RCD are

The first three tests required for an initial verification are

The maximum rating of an RCD used for fire protection is

The correct IP rating for equipment installed in Zone 2 of a bathroom is

The IP rating used to indicate finger protection is

The current which should cause automatic disconnection of a 20a type B BS EN 60898 circuit breaker is

The stated maximum Ze for a TN-S supply system is

A TT system is normally an

Ipf is the symbol used for the value of