UNIT REVISION

City & Guilds 2357 Unit 318: Diagnosing and correcting electrical faults in electrical systems and equipment in buildings, structures and the environment (ELTP07) — Complete Revision Guide

A structured revision walkthrough of every topic in City & Guilds 2357 Unit 318 (Diagnosing and correcting electrical faults in electrical systems and equipment in buildings, structures and the environment (ELTP07)). Use it as a personal study checklist — work through each topic, tick off the points you can confidently explain or calculate, and use the linked Elec-Mate tools to practice the calculation-led parts. Designed for apprentices working through an NVQ pathway with on-the-job portfolio evidence.

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8 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 2357 Unit 318 — Diagnosing and correcting electrical faults in electrical systems and equipment in buildings, structures and the environment (ELTP07) — is a core component of the Level 3 NVQ Diploma in Installing Electrotechnical Systems and Equipment.
  • 2This unit is typically delivered to apprentices working through an NVQ pathway with on-the-job portfolio evidence and covers 3 main topic areas.
  • 3Across the 3 topics there are 18 specific points you should be able to explain, demonstrate or calculate before the end-of-unit assessment.
  • 4Common assessment formats include online multiple-choice exams, written short-answer papers, and practical workshop tasks observed by your tutor.
  • 5Use the structured topic list below as a personal checklist — work through each point and confirm you can explain it without referring to your notes.
  • 6The Elec-Mate apprentice tier includes mock exams, flashcards, and revision notes mapped to this unit. Use the tools to test yourself between college blocks and on-site days.
01 · Unit Revision

Topic 1: How to confirm safety of the system and equipment prior to diagnosing and correcting electrical faults in accordance with statutory and non statutory regulations

In this section you should be confident with the following points. Each one is a specific topic you should be able to explain, demonstrate, or calculate.

  • Carry out safe isolation procedures in accordance with regulatory requirements for electrical installations.
  • Ensure the Health and Safety of themselves and others within the work location during inspection, testing and commissioning.
  • Select and use appropriate warning notices and barriers.
  • Check the safety of electrical systems prior to the commencement of diagnosing and correcting electrical faults. 166 City & Guilds Level 3 Diplomas in Electrotechnical Technology (2357) Unit 318 Diagnosing and correcting electrical faults in electrical systems and equipment in buildings, structures and the environment (ELTP07).
02 · Unit Revision

Topic 2: How to carry out procedures to identify faults on electrical systems and equipment

In this section you should be confident with the following points. Each one is a specific topic you should be able to explain, demonstrate, or calculate.

  • Use effective methods of communication to ascertain clear and detailed information about reported faults and any components which require replacing.
  • Identify and use appropriate system specification documents which relate to the electrotechnical systems and equipment being worked upon.
  • Report information about potential disruption that may be a consequence of fault diagnosis and correction work to relevant people.
  • Assess the safe working practices which apply in the working environment to confirm that it is safe for fault identification work to take place.
  • Perform suitable diagnostic tests on the installed electrotechnical systems to successfully identify faults.
  • Use appropriate methods for locating faults on electrical systems and equipment.
  • Use appropriate tools and instruments correctly to complete fault diagnosis work.
  • Confirm test instruments are fit for purpose, functioning correctly and are correctly calibrated..
03 · Unit Revision

Topic 3: How to correct faults on electrical systems and equipment

In this section you should be confident with the following points. Each one is a specific topic you should be able to explain, demonstrate, or calculate.

  • Confirm appropriate repairs, removals and replacements and their implications with relevant people including: • other workers/colleagues • customers/clients • representatives of other services.
  • Perform fault correction procedures correctly and safely using appropriate tools, equipment and material.
  • Perform the removal and replacement of components and associated equipment from electrotechnical systems to ensure: • ease of access to enable future maintenance • accordance with: o relevant regulations o manufacturer’s instructions o organisational procedures.
  • Apply appropriate procedures to ensure electrotechnical systems, equipment and components are left safe, in accordance with industry regulations, if the fault cannot be corrected immediately.
  • Perform appropriate inspection and testing procedures to confirm that systems, equipment and components are functioning correctly after completion of fault correction work.
  • Record test results and other appropriate information regarding the fault correction work clearly and accurately and report to relevant people, such as: • Other workers/colleagues • Customers/clients • Representatives of other services. Unit 318 Diagnosing and correcting electrical faults in electrical systems and equipment in buildings, structures and the environment (ELTP07) Notes for guidance Unit entry requirements Prior to undertaking this unit a learner must provide auditable evidence that they have the relevant knowledge and understanding as detailed in the units: • Understanding the principles, practices and legislation for diagnosing and correcting electrical faults in electrotechnical systems and equipment in buildings, structures and the environment (2357-608/ELTK07) • Understanding the electrical principles associated with the design, building, installation and maintenance of electrical equipment and systems (2357-609/ELTK08). Evidence requirements Learning.

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04 · Unit Revision

Study This Unit with Elec-Mate

Elec-Mate’s apprentice tier turns this unit checklist into an active study plan. You get mock exam questions, flashcards, and revision notes mapped to this unit, plus working calculators for every calculation-led topic. Most apprentices use the app between college blocks and on the train to site — short bursts of revision compound across the year.

For apprentices

The Elec-Mate apprentice tier includes mock exams, flashcards, and revision notes for City & Guilds 2357 Unit 318 plus every other unit in your qualification. 7-day free trial — see your progress on the tutor dashboard.

A Five-Step Revision Plan for This Unit

A repeatable approach that works for City & Guilds 2357 Unit 318 and every other unit in your qualification.

1

Read through every topic point once

Start at Topic 1 and read every bullet point. Don’t try to memorise — just get familiar with the scope. Note any topic that feels unfamiliar so you can come back to it.

2

Map each topic to its calculator or guide

For calculation-led topics, open the relevant Elec-Mate calculator and try one worked example. For theory-led topics, find the matching section in BS 7671 or the IET On-Site Guide.

3

Work through Elec-Mate mock exam questions

The Elec-Mate apprentice tier includes mock questions mapped to this unit. Aim for 80%+ on a clean run before the real exam.

4

Get hands-on time on the bench

For practical units (inspection and testing, installation), ask your tutor for additional workshop access. The bench is where the points click.

5

Self-explain each topic to a peer

If you can explain a topic in your own words to another apprentice and they understand it, you know it. This is the single highest-leverage revision tactic.

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