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City & Guilds 2365 Unit 614 - Mock Exam A (2025) - With detailed marking schemes, Exams of Electrical Engineering

Westminster CollegeElectrical Engineering

The City & Guilds 2365 Unit 614 Mock Exam A (2025) is meticulously designed to provide electrical engineering students with an accurate and rigorous simulation of the official Unit 614 examination. This mock exam serves as an essential preparatory tool for candidates aiming to achieve certification in the City & Guilds Level 2 Electrical Installation qualification. Developed in alignment with the latest 2025 syllabus updates, the exam replicates real-world testing conditions to enhance candidate familiarity with question formats, time constraints, and critical subject areas. By engaging with this mock exam, students can effectively gauge their understanding of key electrical principles, identify knowledge gaps, and improve examination technique, thereby increasing their likelihood of success. City & Guilds 2365 Unit 614 mock exam 2025, City & Guilds Electrical Installation mock test, electrical installation mock exam #CityAndGuilds2365 #Unit614MockExam #ElectricalInstallation

Typology: Exams

2024/2025

Available from 05/25/2025

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2365 Unit 614
Mock Exam Version A
Actual Questions and Revised Answers
100% Guarantee Pass
This document
a mock exam, covers several areas including verification
documents, inspection responsibilities, and likely other
topics related to the field of study. It uses a multi-section format to test
knowledge on these specific areas. The exam simulates the structure of a
real exam, providing practice and preparation for a more formal
assessment.
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Download City & Guilds 2365 Unit 614 - Mock Exam A (2025) - With detailed marking schemes and more Exams Electrical Engineering in PDF only on Docsity!

2365 Unit 614

Mock Exam Version A

Actual Questions and Revised Answers

100% Guarantee Pass

This document

a mock exam, covers several areas including verification documents, inspection responsibilities, and likely other topics related to the field of study. It uses a multi-section format to test knowledge on these specific areas. The exam simulates the structure of a real exam, providing practice and preparation for a more formal assessment.

****State the purpose of initial verification (2 marks)****

  • The purpose of initial verification is to confirm that a new electrical installation or an alteration/addition complies with the requirements of BS
  • It ensures that the installation is safe to use and free from defects before being put into service.

****State the purpose of periodic inspection and testing (2 marks)****

  • The purpose is to assess the continued safety and condition of an existing installation.
  • It checks for any deterioration, defects, or changes that may affect electrical safety over time.

****When would a Minor Electrical Installation Works Certificate be issued? (2 marks)****

  • It is issued for minor works that do not include the installation of a new circuit, such as adding a socket to an existing circuit or replacing a light fitting.
  • The certificate is used where the work does not extend to a full new installation or significant alteration.

IP2X is an Ingress Protection (IP) rating. The "2" indicates protection against solid objects greater than 12.5 mm (such as fingers), and "X" means no specific protection against liquids is specified. Application: IP2X is applied to enclosures and equipment to provide basic protection (formerly known as ‘protection against direct contact’), ensuring that people cannot accidentally touch live parts with a finger or other object larger than 12.5 mm, in accordance with BS 7671/IEE wiring regulations.

****2. Five items to check on new metallic trunking before installing cables (15 marks):** **3. State two instruments used for Earth Electrode Test (1 Mark):****

  • Earth resistance tester (Earth megger) Item Number What item is being checked before the cables are installed What the item is being checked for Human sense used. 1 Physical condition of trunking and covers^ Damage, sharp edges, burrs^ Sight/Touch 2 Joints and connections between trunking sections Secure fitting, electrical continuity Sight/Touch 3 Presence and security of end caps and glands Proper sealing and fitting to prevent ingress Sight/Touch 4 Cleanliness of the inside of the trunking^ Absence of dust, debris, or water Sight 5 Mounting security to wall or structure^ Firm and level attachment, no loose fixings Sight/Touch
  • Multifunction installation tester with earth electrode testing function

****4. Briefly explain the three main stages in conducting an Earth Electrode Test using test method E1 (3 marks):****

  1. Disconnection: Disconnect the earth electrode from the installation to ensure no parallel earthing paths affect the test.
  2. Test Setup: Place auxiliary earth spikes at suitable distances (typically 5m–10m apart) to serve as current and potential electrodes.
  3. Measurement: Use the test instrument to pass current between the earth electrode and one auxiliary spike, and measure the resulting voltage difference with the other. Record the earth electrode resistance reading from the test instrument. ****What are the three connection points used in an earth electrode test using test method E1** (3 marks)**
  • The earth electrode under test
  • The current test spike (probe), usually driven into the ground some distance from the electrode
  • The potential test spike (probe), placed between the electrode and the current spike
  • This increases the risk of electric shock, as the disconnection time will be longer than allowed and earth fault protection may not be effective.

****State two factors that would cause earth fault loop readings to be higher than the acceptable values as stated in BS7671.** (2 marks)**

  • Long or undersized circuit conductors (increased resistance in the circuit wiring).
  • Loose or corroded connections at terminations or joints (increased contact resistance).

The following questions refer to the scenario below.

A new distribution circuit is to be added to the electrical installation in a 15 year old bus depot, to supply a compressor room and the associated single and three phase circuits. The installation forms part of a 400/230 V TN-C-S system and the distribution circuit terminates at a metal-clad TP & N distribution board within the compressor room. The distribution board is protected by 63A BS 88-3 fuses and wired using a five-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 tray work where it enters and exits the ground. The ring final circuits in the compressor room are protected by RCBOs to BS EN 61009 – 1 wired using single core 70° C insulated thermoplastic cables, with copper conductors in surface mounted metallic conduit and trunking. The compressor and lighting circuits are protected by Cb’s to BE EN 60898. All testing is to be carried out at an ambient temperature of 20°C. ****1. State why tests for the initial verification of this installation are required to be carried out in a certain order before the installation is energised. (3 marks)**** Tests for the initial verification must be carried out in a specific sequence to ensure the safety of persons and property, and the integrity of the installation prior to energisation. The order ensures that there are no faults, incorrect connections or potential dangers such as short circuits that could result in injury, fire, or damage to equipment. For example, continuity and insulation resistance tests must be done before energising the system, so that dangerous faults can be identified and rectified before live testing or use. This sequence follows the requirements set out in BS 7671 (the Wiring Regulations).

****2. List the 3 documents that would be issued to the client on completion of Initial Verification. (6 marks)****

  1. To verify that there are no interconnections (cross connections) or spurs incorrectly connected, which could affect disconnection times and circuit safety.

### i) The instrument used for carrying out insulation resistance: Answer: An insulation resistance tester (commonly called a "megger").

### ii) The test voltage applied to a low voltage circuit up to 500V: Answer: 500V d.c. (for a 230/400V system; 250V d.c. may be used for SELV/PSELV or when sensitive equipment is connected).

### iii) The minimum acceptable value of insulation resistance as stated in BS7671: Answer: 1 MΩ (one megaohm) for final circuits up to 500V.

## State three reasons for carrying out polarity tests: (3 marks)

  1. To ensure that all switches are correctly connected in the live conductor (so they disconnect the live, not the neutral).
  2. To confirm that protective devices (fuses, circuit breakers) are connected in the live conductor.
  3. To verify that socket outlets have correct polarity at their terminals (Line, Neutral, Earth in the correct configuration). ## State how tests for polarity may be carried out without the use of a meter: (1 mark) Polarity can be checked using a test lamp or a two-pole voltage indicator by sequentially testing between live, neutral, and earth points to confirm correct connections. (Alternatively: Using a plug-in socket tester for socket outlets; or continuity tester.)

## State the instrument to be used for testing live polarity of the supply and the reason for conducting this test. (2 marks)

| Insulation resistance (N-E) | >2000 MΩ | If you’re filling in a printed test sheet, map each result accordingly to the correct test as above.

**### **1. Five Results and Corresponding Box Numbers Recorded After Ring Final Continuity Testing (5 marks)****

  1. Continuity of Line Conductors (r1 + r1; Box 10)
  2. Continuity of Neutral Conductors (rn + rn; Box 11)
  3. Continuity of CPC Conductors (r2 + r2; Box 12)
  4. Continuity of Cross Connections Line-Neutral at each socket (Box 13)
  5. Continuity of Cross Connections Line-CPC at each socket (Box 14)

(The actual box numbers may differ based on the schedule of test results used, refer to your inspection schedule for precise box numbers.)

### 2. Compressor Circuit Earth Fault Loop Impedance Acceptability (3 marks) Given: Measured Zs = 1.15 Ω Maximum permitted Zs (BS 7671) = 1.37 Ω ****Calculation:**** The measured Zs must be less than or equal to the maximum permitted Zs. [ \text{Measured Zs} = 1.15 , \Omega ] [ \text{Maximum allowed Zs} = 1.37 , \Omega ] [ 1.15, \Omega < 1.37, \Omega ] ** **Conclusion:****

  1. Earth terminal at origin (DNO/CU)
  2. Supply neutral (via transformer winding) back to source
  3. Earth electrode or supplier's earth ****Fully Labelled Diagram:****
 [LIGHT FITTING] | (fault to metal case) | [CPC] | [CONSUMER UNIT (CU)] | | | [MAIN EARTHING CONDUCTOR] | | | [EARTH BAR] | | [LIVE/NEUTRAL] | | | +-------------+ [DNO TRANSFORMER] / \ [EARTH] [NEUTRAL]

****Labelling each part as follows:****

  • A: Point of earth fault (at fitting or accessory)
  • B: CPC (earth conductor in cable)