City & Guilds 2365 Course: Complete Guide

The City & Guilds 2365 Diploma in Electrical Installation is the UK's most widely recognised classroom-based qualification for aspiring electricians. It is the qualification that most adults and career changers take when entering the electrical trade through the diploma route.

Available at Level 2 (foundation) and Level 3 (advanced), the 2365 covers everything from basic electrical science to complex circuit design and fault diagnosis. Delivered through a combination of classroom theory sessions and hands-on practical workshops, it provides the technical knowledge foundation for a career in electrical installation.

This guide gives you a complete overview of the 2365 — the course structure, what you will learn at each level, how you are assessed, practical tips for success, and what comes after.

The 2365 is divided into structured units at each level. Each unit covers a specific area of knowledge or practical skill, and you must pass all units to achieve the full diploma.

Level 2 units

• ✓Health and safety in building services engineering: legislation, risk assessment, PPE
• ✓Principles of electrical science: voltage, current, resistance, magnetism, AC theory
• ✓Electrical installations technology: wiring systems, containment, tools, and materials
• ✓Installation of wiring systems and enclosures: practical cable installation techniques
• ✓Understand how to communicate with others within building services engineering

Level 3 units

• ✓Electrical principles for design, installation, and maintenance: advanced circuit theory
• ✓Practices and procedures for the design of electrical installations: cable sizing, protection
• ✓Fault diagnosis and rectification: systematic fault-finding methodology
• ✓Inspection, testing, and commissioning: understanding test procedures and certification
• ✓Understanding the principles of planning and selection for electrical systems
• ✓Electrical systems design: distribution, diversity, and discrimination

The Level 2 Diploma is designed for complete beginners. It starts from first principles and builds your understanding progressively across 14 to 16 weeks of full-time study.

Typical weekly breakdown

Most training centres structure the Level 2 around a mix of classroom theory (typically 2 to 3 days per week) and practical workshop sessions (2 to 3 days per week). The balance shifts towards more practical work as the course progresses and you begin applying the theory you have learned.

What the practical workshops involve

• ✓Working in dedicated training bays that simulate real installation environments
• ✓Running cables through conduit, trunking, and cable tray
• ✓Wiring ring final circuits, radial circuits, and lighting circuits
• ✓Connecting accessories: sockets, switches, light fittings, consumer units
• ✓Bending conduit and working with different containment systems
• ✓Timed practical assessments under exam conditions

The Level 3 Diploma takes approximately 12 to 14 weeks and assumes you already understand the fundamentals covered at Level 2. The pace is faster and the content is significantly more demanding.

Key areas of increased difficulty

• ✓Cable sizing calculations using BS 7671 tabulated data and correction factors
• ✓Voltage drop calculations for long cable runs
• ✓Fault current calculations and protective device coordination
• ✓Three-phase power systems: star and delta configurations, phase voltages
• ✓Complex distribution board design with diversity calculations
• ✓Systematic fault diagnosis using half-split and other techniques

The maths at Level 3 is considerably more challenging than Level 2. You will need to be comfortable with algebra, using formulas, and working with tables from BS 7671. If maths is not your strongest area, extra revision time will be needed.

The 2365 uses a blend of written examinations and practical assessments at both levels. All assessments are set by City & Guilds and delivered at your training centre under controlled conditions.

Written examinations

• ✓Online, multiple-choice format
• ✓Taken at your training centre under exam conditions
• ✓Timed — typically 60 to 90 minutes per paper
• ✓Cover the full range of theory content for each unit
• ✓You need to achieve the City & Guilds pass mark (typically 60 to 65 percent)

Practical assessments

• ✓Carried out in the workshop under timed, observed conditions
• ✓Level 2: wire a domestic circuit (e.g. ring final, lighting) to specification
• ✓Level 3: more complex tasks including distribution board wiring and fault diagnosis
• ✓Assessed on safety, accuracy, compliance with wiring regulations, and completion within time
• ✓Your work must be correct, safe, and properly labelled

Most training centres provide tools for use during the course, but having your own toolkit helps you become familiar with the tools you will use throughout your career. Here is what you should consider bringing:

Essential tools

• ✓Side cutters and long-nose pliers
• ✓Wire strippers (automatic or manual)
• ✓Flat and Phillips screwdriver set (insulated to VDE standard)
• ✓Voltage indicator (e.g. Fluke T150 or T110) — essential for safe isolation
• ✓Tape measure (at least 5 metres)
• ✓Spirit level (small torpedo level)
• ✓Cable knife or utility knife

PPE requirements

• ✓Safety boots with steel or composite toe cap
• ✓Safety glasses or goggles
• ✓Work trousers (not shorts or jeans with rips)
• ✓High-visibility vest (some centres require this)

The 2365 is demanding but achievable with the right approach. Here are practical tips from learners who have completed it successfully:

• ✓Attend every session — the course moves fast and gaps in attendance create gaps in knowledge
• ✓Practise calculations daily — Ohm's law, power formulas, and cable sizing become second nature with repetition
• ✓Use the workshop time well — wiring speed and accuracy improve dramatically with practice
• ✓Form a study group — discussing concepts with classmates helps everyone understand better
• ✓Ask questions in class — if something is unclear, ask immediately rather than falling behind
• ✓Start a formula sheet — write down every formula as you encounter it and revise it regularly
• ✓Do past papers — practice with previous exam questions if your provider makes them available

The 2365 Level 2 and Level 3 diplomas give you the technical knowledge, but they are not the end of the journey. To become a fully qualified electrician and obtain your ECS Gold Card, you need additional qualifications.

Your next steps

• ✓18th Edition Wiring Regulations (C&G 2382-22): mandatory knowledge of BS 7671
• ✓2391 Inspection and Testing: ability to inspect, test, and certify installations
• ✓NVQ Level 3 (C&G 2357): workplace-based proof of on-the-job competence
• ✓ECS Gold Card: apply once you hold all the above qualifications

Many learners take the 18th Edition course during or immediately after their Level 3 Diploma, which keeps the momentum going and ensures the knowledge is fresh when you start referencing BS 7671 in practice.