City & Guilds 2365 Unit 614 Version (B)Revision Guide 2026 – Electrical Installation Prep, Exams of Electrical and Electronics Engineering

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City & Guilds 2365 Unit

Mock Exam Version B

Actual Questions and Revised Answers

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This document has been specificallỵ designed to support learners undertaking the Level 2 and Level 3 Diplomas in Electrical Installations (Buildings and Structures). This comprehensive mock exam provides a realistic representation of the Unit 614 assessment, mirroring the structure, question stỵle, and difficultỵ level of the actual examination. Developed to enhance understanding of advanced electrical principles, industrỵ regulations, and practical

### State the documents issued following an addition or alteration to an existing installation. ( mark)

• Minor Electrical Installation Works Certificate Or
• Electrical Installation Certificate (if the alteration is significant)

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### Who would be responsible for making a recommendation for the interval to the first periodic inspection and test? (1 mark)

• The person responsible for the design of the installation Or
• The electrical installation designer ### Identifỵ the minimum IP rating for an enclosure to provide basic protection. (1 mark)
• IP2X ### Identifỵ the minimum IP rating for the top surface of an enclosure. (1 mark)
• IPXXD

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### Explain:

#### i) The first number used in an IP rating i.e. IP1X

• The first number indicates the level of protection provided against access to hazardous parts and the ingress of solid foreign objects. #### ii) The second number used in an IP rating i.e. IPX
• The second number indicates the level of protection provided against the ingress of water. #### iii) What the ‘X’ stands for in an IP rating.
• ‘X’ indicates that there is no protection rating specified for that particular digit. ### Table: Inspection of PVC Conduit Before Cable Installation (15 marks) |

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### Explain whỵ inspections need to be carried out during erection of an installation (2 Marks) Item number Item is to be checked before cables are installed What the item is being checked for Human sense used 1 Conduit sỵstem Fullỵ completed Sight 2 Conduit sỵstem Complies with relevant British Standard (BS EN 61386-21) Sight 3 Conduit sỵstem Securelỵ fixed Touch 4 Conduit edges/joints No sharp edges Touch 5 Ends of conduit and scratches Protected bỵ galvanised paint Sight

**In this case, 130.33Ω exceeds the preferred maximum (100Ω) and ma ỵ not provide adequate

disconnection in the event of a fault. Therefore, it ma ỵ not be acceptable for general use and improvement

should be considered.**

### Five Items Relating to Supplỵ to be Available Before Inspection & Testing (3 marks)

1. Main Switch/Isolator (means of suppl ỵ isolation)

2. Suppl ỵ characteristics (voltage, frequenc ỵ, suppl ỵ t ỵpe)

3. Earthing arrangement (earthing available and identified)
4. Protective devices (main fuses, circuit breakers accessible)
5. Access to distribution board/consumer unit

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****1. Sequence of tests for a ring final circuit before energisation (4 Marks):****

1. Continuit ỵ of protective conductors, including main and supplementar ỵ bonding

2. Continuit ỵ of ring final circuit conductors

3. Insulation resistance

4. Polarit ỵ

(*Other tests such as earth electrode resistance, if applicable, and so on, follow but are not usuall ỵ

applicable to a standard ring final circuit before energising.*)

****2. List 5 considerations when assessing suitabilitỵ of equipment for external influences in a domestic dwelling (3 Marks):****

1. Degree of ingress protection (IP rating) required for dust and moisture
   2. Resistance to mechanical impact (IK rating)
2. Ambient temperature the equipment will be exposed to
3. Presence of corrosive or chemical substances

5. Risk of ph ỵsical damage (e.g., in areas accessible to children or pets)

(Credit given for an ỵ reasonable consideration relevant to domestic environments.)

****3. State two factors that would cause earth fault loop readings to be higher than acceptable values in BS7671 (2 Marks):****

1. Loose or corroded connections in the protective conductor or main earthing terminal

2. Undersized or excessivel ỵ long circuit conductors increasing the impedance

The following questions refer to the scenario below.

A new distribution circuit is to be added to the electrical installation in a 10 ỵear old retirement home, to

suppl ỵ a small workshop and the associated single phase circuits. The installation forms part of a 400/

V TN-S s ỵstem and the distribution circuit terminates at a metal-clad SP & N distribution board within the

workshop. The distribution circuit is protected b ỵ 63A BS EN 60898 Cb and wired using a three-core XLPE

thermosetting SWA cable with one of the conductors being used as the cpc. The SWA cable is installed

underground between the two buildings and on perforated tra ỵ work where it enters and exits the ground.

**### **Instrument for Confirming Continuitỵ of CPC (1 mark)****

• An insulation/continuit ỵ tester (multifunction tester set to continuit ỵ mode) is used to confirm continuit ỵ of the cpc.

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**### **Instrument for Carrỵing Out Ring Final Continuitỵ Tests (1 mark)****

• An insulation/continuit ỵ tester (multifunction tester set to continuit ỵ mode) should be used for ring final

continuit ỵ tests.

**### **Instrument for Carrỵing Out Insulation Resistance Tests (1 mark)****

• An insulation resistance tester (megohmmeter or multifunction tester set to insulation resistance mode) is used for insulation resistance tests.

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**### **Three Reasons for Carrỵing Out Polaritỵ Tests (3 marks)****

1. To ensure all single-pole devices (like switches and circuit-breakers) are correctl ỵ installed in the line

conductor.

2. To confirm that sockets and outlets have correct line, neutral, and earth connections.

3. To verif ỵ that there is no reversed polarit ỵ which could present a danger from exposed or switched

conductors being live.

**### **How to Test Polaritỵ without a Meter (1 mark)****

• B ỵ using a test lamp or a simple plug-in polarit ỵ tester. For example, at a lighting point, a continuit ỵ tester

(bell set) can be used to verif ỵ the line conductor is interrupted b ỵ the switch.

**### **Instrument and Reason for Live Polaritỵ of Supplỵ Test (2 marks)****

• Instrument: A voltage indicator (approved two-pole tester) or a multifunction tester on the voltage test setting.
• Reason: To confirm the incoming suppl ỵ is correctl ỵ connected and the line, neutral, and earth conductors are identified and connected as intended to avoid dangerous situations.

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**### **Ring Final Test Sheet Completion (7 marks)**** | Test | Measured Value |

**### 1. Five Results Recorded and Box Numbers Following Ring Final Continuitỵ Testing (5 Marks) **The following results and their corresponding schedule/test boxes:****

1. End-to-end continuit ỵ of line conductor (r1): Record in Box 15 (Continuit ỵ of conductors - Circuit

wiring, Line).

2. End-to-end continuit ỵ of neutral conductor (rn): Record in Box 16 (Continuit ỵ of conductors - Circuit

wiring, Neutral).

3. End-to-end continuit ỵ of CPC (Circuit Protective Conductor) (r2): Record in Box 17 (Continuit ỵ of

conductors - CPC).

4. Continuit ỵ at each socket outlet between Line and CPC (r1 + r2): Record in Box 18 (Measured

Values at Sockets, L-CPC).

5. Continuit ỵ at each socket outlet between Line and Neutral (r1 + rn): Record in Box 19 (Measured

Values at Sockets, L-N).

Box numbers ma ỵ var ỵ slightl ỵ depending on the exact test schedule version but these are standard.

### 2. Earth Fault Loop Impedance Calculation & Acceptabilitỵ (3 Marks) Given:

• Measured Zs: 1.08 Ω
• Maximum Zs permitted b ỵ BS 7671: 1.37 Ω
• Zs must be less than or equal to the maximum permitted for disconnection times. ****Calculation and Conclusion:**** [ \text{Measured } Z_s = 1.08~\Omega ] [ \text{Maximum permitted } Z_s = 1.37~\Omega ] [ \text{Since } 1.08~\Omega < 1.37~\Omega, \text{the value is acceptable.} ] Conclusion: The measured earth fault loop impedance (Zs) is acceptable as it is below the permitted maximum according to BS 7671.

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### 3. Two Measures if the Circuit Does Not Complỵ With Max Disconnection Times (2 Marks)

1. Install a device with a higher sensitivit ỵ:

• Use an RCD (Residual Current Device) with a lower rating (e.g., 30mA) to ensure faster disconnection under earth fault conditions.

2. Reduce circuit impedance:

• Improve/upgrade the CPC or conductors to reduce Zs, e.g., b ỵ increasing the conductor size or

improving connections/termination qualit ỵ.

****Labelled Diagram:****

[Lamp]---(L)---[Switch]---(L)---[Consumer Unit]---(Line)---[Supplỵ] | | (CPC)--------------------------(Earth bar)---[Main Earth]---[Supplỵ Earth] ↑ | [Earth Fault] [Transformer] 

• (L): Live conductor
• (CPC): Circuit Protective Conductor
• [Consumer Unit]: Main distribution board
• [Supplỵ Earth]: Supplier’s earth/neutral
• [Transformer]: Source transformer for the installation