CITY & GUILDS 2365 UNIT 614 MOCK
EXAM PREP | QUESTIONS AND
ANSWERS |2026/2027 UPDATE | JUST
RELEASED
1. Which statutory regulation governs the safety of electrical systems in the workplace in the
UK?
A. Electricity at Work Regulations 1989
B. Health and Safety at Work Act 1974
C. BS 7671 Requirements for Electrical Installations
D. Building Regulations Part P
Answer: A
Conceptual Explanation: The Electricity at Work Regulations 1989 (EAWR) is the primary
statutory legislation specifically targeting electrical safety in professional environments.
2. What is the maximum permitted voltage drop for a 230V lighting circuit in a commercial
installation supplied from a public source?
A. 6.9V
B. 5%
C. 3%
,D. 11.5V
Answer: C
Conceptual Explanation: According to BS 7671, the maximum voltage drop for lighting
circuits supplied from a public distribution system is 3% (approx 6.9V for 230V).
3. When performing an Insulation Resistance test on a 230V circuit, what is the minimum
acceptable resistance value according to BS 7671?
A. 0.5 MΩ
B. 1.0 MΩ
C. 2.0 MΩ
D. 500 MΩ
Answer: B
Conceptual Explanation: For circuits operating at nominal voltages up to 500V (excluding
SELV/PELV), the minimum Insulation Resistance is 1.0 MΩ.
4. Which of the following describes a TN-S earthing system?
A. The neutral and protective conductors are combined in a single conductor throughout
the system
B. The consumer has a separate earth electrode not connected to the supplier’s earth
C. The earth is provided by the metallic sheath of the service cable
D. The protective and neutral conductors are separate throughout the system
, Answer: D
Conceptual Explanation: In a TN-S system, the Neutral (N) and Protective (S - Separate)
conductors are separate throughout the installation and the supply.
5. Calculate the Earth Fault Loop Impedance (Zs) if Ze is 0.35 Ω and (R1+R2) is 0.82 Ω.
A. 0.47 Ω
B. 2.34 Ω
C. 1.52 Ω
D. 1.17 Ω
Answer: D
Conceptual Explanation: Zs is calculated using the formula Zs = Ze + (R1+R2). Therefore,
0.35 + 0.82 = 1.17 Ω.
6. A 32A Type B MCB (BS EN 60898) is used for a circuit with a disconnection time of 0.4s.
What is the maximum permitted Zs?
A. 1.1 Ω
B. 1.37 Ω
C. 0.72 Ω
D. 1.44 Ω
Answer: D
EXAM PREP | QUESTIONS AND
ANSWERS |2026/2027 UPDATE | JUST
RELEASED
1. Which statutory regulation governs the safety of electrical systems in the workplace in the
UK?
A. Electricity at Work Regulations 1989
B. Health and Safety at Work Act 1974
C. BS 7671 Requirements for Electrical Installations
D. Building Regulations Part P
Answer: A
Conceptual Explanation: The Electricity at Work Regulations 1989 (EAWR) is the primary
statutory legislation specifically targeting electrical safety in professional environments.
2. What is the maximum permitted voltage drop for a 230V lighting circuit in a commercial
installation supplied from a public source?
A. 6.9V
B. 5%
C. 3%
,D. 11.5V
Answer: C
Conceptual Explanation: According to BS 7671, the maximum voltage drop for lighting
circuits supplied from a public distribution system is 3% (approx 6.9V for 230V).
3. When performing an Insulation Resistance test on a 230V circuit, what is the minimum
acceptable resistance value according to BS 7671?
A. 0.5 MΩ
B. 1.0 MΩ
C. 2.0 MΩ
D. 500 MΩ
Answer: B
Conceptual Explanation: For circuits operating at nominal voltages up to 500V (excluding
SELV/PELV), the minimum Insulation Resistance is 1.0 MΩ.
4. Which of the following describes a TN-S earthing system?
A. The neutral and protective conductors are combined in a single conductor throughout
the system
B. The consumer has a separate earth electrode not connected to the supplier’s earth
C. The earth is provided by the metallic sheath of the service cable
D. The protective and neutral conductors are separate throughout the system
, Answer: D
Conceptual Explanation: In a TN-S system, the Neutral (N) and Protective (S - Separate)
conductors are separate throughout the installation and the supply.
5. Calculate the Earth Fault Loop Impedance (Zs) if Ze is 0.35 Ω and (R1+R2) is 0.82 Ω.
A. 0.47 Ω
B. 2.34 Ω
C. 1.52 Ω
D. 1.17 Ω
Answer: D
Conceptual Explanation: Zs is calculated using the formula Zs = Ze + (R1+R2). Therefore,
0.35 + 0.82 = 1.17 Ω.
6. A 32A Type B MCB (BS EN 60898) is used for a circuit with a disconnection time of 0.4s.
What is the maximum permitted Zs?
A. 1.1 Ω
B. 1.37 Ω
C. 0.72 Ω
D. 1.44 Ω
Answer: D
