City & Guilds 2357: Level 3 NVQ Diploma in Installing Electrotechnical Systems and Equipment — Complete 2026 Guide

City & Guilds 2357 (Level 3 NVQ Diploma in Installing Electrotechnical Systems and Equipment) is a Level 3 qualification awarded by City & Guilds and regulated by Ofqual. It is designed for adult learners, career-changers, experienced workers, those outside the funded apprenticeship route and typically runs 2-3 years typical for adult learners.

The qualification is built around 22 core units. Each unit covers a distinct theme — health and safety, electrical science, installation, fault diagnosis, inspection and testing, design — and combines theory assessment with practical workshop observation. Below is every unit with a direct link to its full revision page.

Click any unit to open the full revision page — every topic point, exam tips, 5-step study plan, and Elec-Mate practice tools mapped to that unit.

1. Unit 311 — Applying Health and Safety legislation and working practices (installing and maintaining electrotechnical systems and equipment) (ELTP01) (14 topic points).
2. Unit 312 — Applying environmental legislation, working practices and the principles of environmental technology systems (ELTP02) (6 topic points).
3. Unit 313 — Overseeing and organising the work environment (electrical installation) (ELTP03) (19 topic points).
4. Unit 315 — Planning, preparing and installing wiring systems and associated equipment in buildings, structures and the environment (ELTP04) (21 topic points).
5. Unit 316 — Terminating and connecting conductors, cables and flexible cords in electrical systems (ELTP05) (9 topic points).
6. Unit 317 — Inspecting, testing, commissioning and certifying electrotechnical systems and equipment in buildings, structures and the environment (ELTP06) (15 topic points).
7. Unit 318 — Diagnosing and correcting electrical faults in electrical systems and equipment in buildings, structures and the environment (ELTP07) (18 topic points).
8. Unit 321 — Understanding the practices and procedures for overseeing and organising the work environment (electrical maintenance) (ELTK 03a) (30 topic points).
9. Unit 322 — Understanding the practices and procedures for planning and preparing to maintain electrotechnical systems and equipment (ELTK 09a) (23 topic points).
10. Unit 323 — Understanding the practices and procedures for maintaining electrotechnical systems and equipment (ELTK 09) (15 topic points).
11. Unit 332 — Plan and prepare to maintain electrotechnical systems and equipment (ELTP 09a) (14 topic points).
12. Unit 333 — Maintain electrotechnical systems and equipment (ELTP 09) (14 topic points).
13. Unit 399 — Electrotechnical occupational competence (ELT OC1) (29 topic points).
14. Unit 601 — Understanding Health and Safety legislation, practices and procedures (installing and maintaining electrotechnical systems and equipment) (ELTK 01) (24 topic points).
15. Unit 602 — Understanding environmental legislation, working practices and the principles of environmental technology systems (ELTK 02) (12 topic points).
16. Unit 603 — Understanding the practices and procedures for overseeing and organising the work environment (Electrical Installation) (ELTK03) (30 topic points).
17. Unit 604 — Understanding the principles of planning and selection for the installation of electrotechnical equipment and systems in buildings, structures and the environment (ELTK04a) (13 topic points).
18. Unit 605 — Understanding the practices and procedures for the preparation and installation of wiring systems and electrotechnical equipment in buildings, structures and the environment (ELTK04) (21 topic points).
19. Unit 606 — Understanding the principles, practices and legislation for the termination and connection of conductors, cables and cords in electrical systems (ELTK05) (11 topic points).
20. Unit 607 — Understanding principles, practices and legislation for the inspection, testing, commissioning and certification of electrotechnical systems and equipment in buildings, structures and the environment (ELTK06) (38 topic points).
21. Unit 608 — Understanding the principles, practices and legislation for diagnosing and correcting electrical faults in electrotechnical systems and equipment in buildings, structures and the environment (ELTK07) (27 topic points).
22. Unit 609 — Understanding the electricalprinciples associated with the design, building, installation and maintenance of electrical equipment and systems (ELTK08) (47 topic points).

Portfolio-based — typically 80+ pieces of on-the-job evidence + AM2 (where applicable). Each individual unit also has its own assessment — typically a mix of online multiple-choice exams, written short-answer papers, and practical workshop tasks observed by your tutor or assessor.

Plan your revision unit by unit using the linked Elec-Mate revision pages above. Each gives you the topic checklist, common mistakes, and a 5-step revision plan.

Funding route: Mostly self-funded or employer-funded; some Adult Learner Loan eligibility. Exact arrangements vary by your specific employer, college, and personal circumstances — confirm with your training provider before enrolling.

The Elec-Mate apprentice tier covers every unit in City & Guilds 2357 with mock exams, flashcards, revision notes, and OJT (off-the-job) hour tracking. Tutors get a dashboard showing every apprentice’s progress in real time.