What is City & Guilds 2365 and why is it the standard electrical qualification?

City & Guilds 2365 refers to the qualification number for the City & Guilds Level 2 and Level 3 Diplomas in Electrical Installations (Buildings and Structures). It is the most widely used on-programme qualification for electrical apprentices in England and Wales. City & Guilds (C&G) has been the dominant awarding body for vocational electrical qualifications in the UK for over a century, and the 2365 has been updated to align with the current Level 3 Electrical Installation apprenticeship standard (ST0145). Employers, JIB, and competent person schemes all recognise C&G 2365 as the standard qualification route.

What is the difference between the Level 2 Certificate and the Level 3 Diploma?

The City & Guilds 2365 qualification is delivered in two stages. The Level 2 Certificate in Electrical Installations (Buildings and Structures) is the first stage, typically completed in Year 1 and Year 2 of the apprenticeship. It covers fundamental electrical theory, installation methods, basic wiring, and health and safety. The Level 3 Diploma in Electrical Installations (Buildings and Structures) is the second stage, typically completed in Year 2 and Year 3. It covers more advanced topics: inspection and testing, fault diagnosis, electrical system design, three-phase systems, and specialist electrical systems. Both together constitute the on-programme qualification component of the apprenticeship.

How long does it take to complete City & Guilds 2365 Level 3?

The Level 3 Diploma component of the C&G 2365 typically takes two years to complete as part of an apprenticeship, as it runs alongside on-the-job training. College attendance is usually one day per week (day release) or in block release patterns, depending on the training provider. The total guided learning hours for the Level 3 Diploma are typically 600 to 700 hours, combining formal college teaching, self-directed study, and practical work. If you are studying the qualification without an apprenticeship (full-time at college), it can be completed in one year.

What units are in the City & Guilds 2365 Level 3 Diploma?

The Level 3 Diploma includes mandatory units covering: Electrical Installations Technology (Unit 201/301 — theory of electrical systems, BS 7671 requirements), Inspection, Testing and Commissioning of Electrical Systems (Unit 302 — test procedures, certificates, and reporting), Electrical System Design (Unit 305 — load calculations, cable selection, voltage drop, fault current calculations), Fault Diagnosis and Rectification (Unit 303), Electrical Systems in Buildings (Unit 304), and Specialist Electrical Systems (Unit 306 — fire alarm systems, emergency lighting, solar PV, etc.). The exact unit numbers may vary slightly between qualification versions — check with your college or awarding body for the current unit structure.

How is City & Guilds 2365 Level 3 assessed?

The C&G 2365 Level 3 is assessed through a combination of: written examinations (multiple-choice and short-answer questions, sat under exam conditions at your college); practical assignments (tasks completed in the college workshop that test your ability to carry out and document electrical work); and synoptic assessments that integrate knowledge and practical skills. Some units also include online assessments. Your college will have an assessment plan showing which assessment methods apply to each unit. Pass, merit, and distinction grades are available for individual units, contributing to the overall qualification grade.

Is City & Guilds 2365 the same as the 18th Edition?

No — they are different qualifications. City & Guilds 2365 is the main electrical installation qualification covering the full breadth of installation work across all three years of the apprenticeship. The City & Guilds 2382 (Requirements for Electrical Installations — BS 7671) is the separate qualification that specifically tests your knowledge of the 18th Edition of the Wiring Regulations (BS 7671:2018+A4:2026). The C&G 2382 is sometimes called the '18th Edition' and is a standalone qualification required for the JIB ECS Gold Card and competent person scheme registration. You will typically study the 2382 alongside the later years of your 2365.

What comes after City & Guilds 2365 Level 3?

After completing the C&G 2365 Level 3, you will proceed to the End-Point Assessment (EPA) if you meet the gateway requirements (including the AM2 or AM2S practical assessment). Once qualified, common next steps include: City & Guilds 2391 (Inspection and Testing) to qualify for EICR work; City & Guilds 2396 (Design and Verification of Electrical Installations) for design work; City & Guilds 2382 renewal when the Wiring Regulations are updated; and the HNC in Electrical Engineering (Level 4) if you want to move into design or management. The JIB ECS Gold Card application also follows immediately after qualification.

QUALIFICATION GUIDE

City & Guilds Level 3 Electrical Installation: 2365 Qualification Guide

Everything you need to know about the City & Guilds 2365 Level 3 Diploma in Electrical Installations — qualification structure, units covered, assessment methods, how to achieve distinction, and what comes next after you qualify.

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14 min readUpdated 2026-05-18Andrew Moore, Founder of Elec-Mate

Written and reviewed by Andrew Moore, founder of Elec-Mate, against BS 7671:2018+A4:2026, IET Guidance Note 3 and the IET On-Site Guide.

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Key Takeaways

1City & Guilds 2365 is the most widely used on-programme qualification for electrical apprentices in England and Wales at Level 3.
2The full qualification is the City & Guilds Level 3 Diploma in Electrical Installations (Buildings and Structures) — it is delivered in two stages (Certificate at Level 2, Diploma at Level 3).
3Level 3 units cover inspection and testing, fault diagnosis, electrical system design, three-phase systems, and specialist installations — significantly more complex than Level 2.
4Assessment is through written exams (multiple-choice and short-answer), practical assignments, and synoptic assessments that combine knowledge and practical skills.
5Distinction grades are achievable in individual units — consistent distinction-level performance strengthens your EPA application and demonstrates employer-ready competence.

01 · Qualification Guide

What is City & Guilds 2365?

City & Guilds 2365 is the qualification number assigned to the City & Guilds Level 2 and Level 3 Diplomas in Electrical Installations (Buildings and Structures). It is the most widely used on-programme qualification for electrical apprentices in England and Wales and has been updated to align with the current apprenticeship standard (ST0145) for Level 3 Electrical Installation.

Full qualification title: City & Guilds Level 3 Diploma in Electrical Installations (Buildings and Structures). Qualification number: 2365. Awarding body: City & Guilds (part of the City & Guilds Group).
Two stages: The 2365 is delivered in two stages — Level 2 Certificate (covering fundamentals) and Level 3 Diploma (covering advanced installation, inspection and testing, design, and fault diagnosis). Together they form the complete on-programme qualification.
Industry recognition: The C&G 2365 is recognised by JIB for ECS Gold Card applications, by NICEIC/NAPIT/ELECSA for competent person scheme registration, and by employers across the UK as the standard electrical installation qualification.
Related qualifications: The 2365 is separate from C&G 2382 (18th Edition BS 7671), C&G 2391 (Inspection and Testing), and C&G 2396 (Design). These are standalone qualifications studied alongside or after the 2365.

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02 · Qualification Guide

Qualification Structure

The C&G 2365 is structured as a Diploma qualification, meaning it is a substantial qualification covering a broad range of knowledge and skills. It is credit-based, with each unit carrying a credit value that contributes to the overall qualification.

Level 2 Certificate — Year 1/2: Covers fundamental electrical science, installation methods, wiring systems, health and safety, basic testing, and working practices. This stage typically takes 12 to 18 months in an apprenticeship setting.
Level 3 Diploma — Year 2/3: Covers electrical installation technology, inspection and testing, fault diagnosis, electrical system design, three-phase systems, and specialist electrical systems. This stage typically takes 12 to 24 months.
Guided learning hours: The total guided learning hours for the Level 3 Diploma are approximately 600 to 700 hours. This includes formal teaching at college, self-directed study, and practical workshops. Actual study time required is typically higher as exams demand significant revision.

Your training provider (usually a further education college or a private training centre) will provide a scheme of learning showing which units are taught in which term. Use the Elec-Mate Study Centre to revise between college sessions and to prepare for upcoming exams.

03 · Qualification Guide

Units Covered at Level 3

The Level 3 Diploma includes mandatory and optional units. The mandatory units are the core of the qualification and are covered by all learners. The following are the primary mandatory units at Level 3.

Unit 301/201 — Electrical Installations Technology: Advanced electrical theory — three-phase systems, transformers, motors, power factor, protective devices, and BS 7671 requirements in depth. This is typically the most theory-heavy unit and the one apprentices find most challenging.
Unit 302 — Inspection, Testing and Commissioning: Covers the full range of initial verification and periodic inspection procedures under BS 7671 Chapter 6. Includes continuity testing, insulation resistance, polarity, earth fault loop impedance, RCD testing, and certificate completion.
Unit 303 — Fault Diagnosis and Rectification: Systematic fault-finding methodology — half-split, substitution, and injection techniques. Understanding fault categories, safe working during fault diagnosis, and documenting the fault and repair process.
Unit 305 — Electrical System Design: Load calculations, cable selection, voltage drop calculations, protective device selection, earth fault loop impedance calculations, and documentation of the design process in accordance with BS 7671 Appendix 4. This unit links directly to the maths skills required for cable sizing.
Unit 306 — Specialist Electrical Systems: Fire alarm systems (grades and categories), emergency lighting, solar PV installations, EV charging, and other specialist systems covered by BS 7671 and associated standards.

04 · Qualification Guide

Assessment Methods

C&G 2365 Level 3 units are assessed through multiple methods, with different units using different assessment approaches. Understanding how each unit is assessed helps you prepare the right way for each.

Written examinations: Closed-book exams with multiple-choice and short-answer questions. Sat at your college under controlled conditions. Most Level 3 theory units include a written exam. Duration is typically 90 minutes to 2.5 hours depending on the unit.
Practical assignments: Tasks carried out in the college workshop or assessed in the workplace. You are assessed on the quality of your installation work, correct use of test equipment, and accurate completion of documentation (certificates, schedules, reports).
Synoptic assessment: A combined assessment that tests your ability to apply knowledge and practical skills together in a realistic scenario. The synoptic element often appears at the end of the Level 3 to pull together learning from across all units.
Online assessments: Some units include online tests or assignments completed through the City & Guilds Walled Garden platform. These may be formative (practice) or summative (counted towards your grade).

Your college assessment schedule will tell you when each assessment takes place. Plan your revision using the Elec-Mate Study Centre to work through each unit's content systematically before the assessment date.

05 · Qualification Guide

Achieving Distinction

Distinction grades are available for individual units within the C&G 2365 Level 3 Diploma. Achieving distinctions demonstrates to employers, EPAOs, and future educational institutions that you have exceeded the required standard. Here is how to target distinction grades.

Know the distinction criteria: City & Guilds publishes distinction criteria for each unit. These criteria go beyond passing — they require you to demonstrate deeper understanding, justify your decisions, and apply knowledge to unfamiliar scenarios. Review the assessment criteria before each unit exam.
Go beyond the syllabus: Pass-level answers repeat the facts from the course. Distinction-level answers explain the why — why does BS 7671 require this? Why is RCD protection important for this type of circuit? What would happen if this regulation was not followed? Develop your understanding, not just your recall.
Practise calculation accuracy: In design and theory units, distinction-level performance requires accurate and methodical calculations. Show your working clearly, use the correct formula, and check your answer. Careless calculation errors will cost you marks even if your method is correct.
Practical quality matters: In practical assessment units, distinction requires clean, professional installation work — cable routes that are straight and correctly fixed, neat terminations, accurate testing, and complete, correctly-completed documentation. Quality of work is judged holistically, not just on pass/fail criteria.

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06 · Qualification Guide

Inspection and Testing (Unit 302)

Unit 302 — Inspection, Testing and Commissioning of Electrical Systems — is one of the most practically important units in the Level 3. The skills and knowledge you develop here are used daily by qualified electricians carrying out initial verification and periodic inspection work (EICRs).

Key test procedures: Continuity of protective conductors (low resistance measurement), continuity of ring final circuit conductors (end-to-end and cross-connected), insulation resistance (500V DC, minimum 1MΩ), polarity verification, earth fault loop impedance (Zs), prospective fault current (PFC), and RCD operation testing (trip time and trip current).
Documentation: Completing an Electrical Installation Certificate (EIC) for new work or an EICR for periodic inspection. Understanding which observations are coded C1, C2, C3, or FI. Using the Elec-Mate EICR app helps you become familiar with professional certificate completion from early in your training.
Test instrument calibration: All test instruments must be calibrated and have a current calibration certificate. Understanding calibration requirements, proof-of-test procedures, and GS38 (HSE guidance on electrical test equipment) is part of the unit content.

07 · Qualification Guide

Fault Diagnosis (Unit 303)

Fault diagnosis is one of the highest-value skills an electrician can have. Good fault-finders are in high demand and command premium rates. Unit 303 introduces you to systematic fault-finding methodology.

Half-split method: Divides the circuit in half to identify which half contains the fault. Eliminates 50% of the circuit with each test. More efficient than working from one end to the other on long circuits.
Substitution method: Replacing suspect components one at a time with known-good substitutes. Simple and effective for component-level faults. Requires a stock of known-good components and appropriate spare parts.
Fault categories: Open circuit (broken conductor or connection), short circuit (unintended low-resistance path between conductors), high resistance fault (damaged joint or conductor under load), and earth fault (live conductor making contact with earth). Each requires different diagnostic approaches.

08 · Qualification Guide

Electrical System Design (Unit 305)

Unit 305 — Electrical System Design — introduces the design process and the calculations required to select cables, protective devices, and distribution equipment that comply with BS 7671. This unit has the highest mathematical content of any Level 3 unit.

Design sequence: Determine design current (Ib), select protective device rating (In ≥ Ib), determine correction factors (Ca, Cg, Ci, Cs), calculate minimum current-carrying capacity (It = In ÷ correction factors), select cable from BS 7671 Appendix 4 tables, check voltage drop, verify earth fault loop impedance (Zs ≤ tabulated maximum).
Correction factors: Ca (ambient temperature correction), Cg (grouping correction for cables run together), Ci (correction for insulating surface installation), Cs (correction for thermal insulation). Each factor reduces the cable's current-carrying capacity — multiple factors are multiplied together.
Exam preparation: Unit 305 exam questions often provide a scenario and ask you to work through the full design sequence. Practise the complete sequence from load to final cable selection using the calculation methods covered in the maths guide.

09 · Qualification Guide

What Comes Next After C&G 2365 Level 3?

Completing the C&G 2365 Level 3 Diploma is your on-programme qualification milestone. What follows depends on whether you have also met the other gateway requirements for your apprenticeship EPA.

End-Point Assessment (EPA)

After passing the gateway (including Level 3 and AM2), you will proceed to the End-Point Assessment. This is the final stage of your apprenticeship, carried out by an independent EPAO (City & Guilds or EAL).

C&G 2391 Inspection and Testing

The City & Guilds 2391 Award in the Initial Verification and Periodic Inspection, Testing and Certification of Electrical Installations is the next qualification most newly qualified electricians obtain. It qualifies you to sign off EICs and carry out EICRs — expanding the work you can do and your earning potential significantly.

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Frequently Asked Questions About City & Guilds 2365 Level 3

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City & Guilds Level 3 Electrical Installation: 2365 Qualification Guide

Key Takeaways

What is City & Guilds 2365?

Get the BS 7671 A4:2026 Cheat Sheet — free

Qualification Structure

Units Covered at Level 3

Assessment Methods

Achieving Distinction

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Inspection and Testing (Unit 302)

Fault Diagnosis (Unit 303)

Electrical System Design (Unit 305)

What Comes Next After C&G 2365 Level 3?

End-Point Assessment (EPA)

C&G 2391 Inspection and Testing

Revise for City & Guilds 2365 with Elec-Mate

Frequently Asked Questions About City & Guilds 2365 Level 3

What is City & Guilds 2365 and why is it the standard electrical qualification?

What is the difference between the Level 2 Certificate and the Level 3 Diploma?

How long does it take to complete City & Guilds 2365 Level 3?

What units are in the City & Guilds 2365 Level 3 Diploma?

How is City & Guilds 2365 Level 3 assessed?

Is City & Guilds 2365 the same as the 18th Edition?

What comes after City & Guilds 2365 Level 3?

Continue reading

EAL Level 3 Guide

End-Point Assessment (EPA) Guide

Career Progression After Your Apprenticeship

Maths for Electrical Apprentices

Elec-Mate Study Centre

What electricians say

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Absolutely amazing

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