UNIT REVISION

City & Guilds 2357 Unit 606: Understanding the principles, practices and legislation for the termination and connection of conductors, cables and cords in electrical systems (ELTK05) — Complete Revision Guide

A structured revision walkthrough of every topic in City & Guilds 2357 Unit 606 (Understanding the principles, practices and legislation for the termination and connection of conductors, cables and cords in electrical systems (ELTK05)). 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 606 — Understanding the principles, practices and legislation for the termination and connection of conductors, cables and cords in electrical systems (ELTK05) — 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 11 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: The principles, regulatory requirements and procedures for completing the safe isolation of electrical circuits and complete electrical installations

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.

  • State the implications of carrying out safe isolations to: • other personnel • customers/clients • public • building systems (loss of supply).
  • State the implications of not carrying out safe isolations to: • self • other personnel • customers/clients • public • building systems (presence of supply).
  • Specify and undertake the correct procedure for completing safe isolation with regard to: • carrying out safe working practices • correct identification of circuit(s) to be isolated • identifying suitable points of isolation • selecting correct test and proving instruments in accordance with relevant industry guidance and standards • correct testing methods • selecting locking devices for securing isolation • correct warning notices • correct sequence for the safe-isolation of an electrical circuit and complete electrical installation. 84 City & Guilds Level 3 Diplomas in Electrotechnical Technology (2357) Unit 606 Understanding the principles, practices and legislation for the termination and connection of conductors, cables and cords in electrical systems (ELTK05).
02 · Unit Revision

Topic 2: The regulatory requirements and procedures for terminating and connecting conductors, cables and flexible cords in electrical wiring 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.

  • Identify and interpret appropriate sources of relevant information for the termination and connection of conductors, cables and flexible cords in electrical wiring systems and equipment.
  • Specify organisational procedures for reporting variations to the installation specification.
  • Describe methods and procedures appropriate to the installation environment to ensure the safe and effective termination and connection of conductors, cables and flexible cords in electrical wiring systems and equipment..
03 · Unit Revision

Topic 3: The procedures and applications of different methods of terminating and connecting conductors, cables, and flexible cords in electrical wiring 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.

  • Explain the advantages, limitations and applications of the following connection methods: • screw • crimped • soldered • non screw compression.
  • Describe the procedures for proving that terminations and connections are electrically and mechanically sound.
  • Explain the consequences of terminations not being electrically and mechanically sound in terms of: • high resistance joints • corrosion and erosion.
  • Specify the Health and Safety requirements appropriate to terminating and connecting conductors, cables and flexible cords in electrical wiring systems and equipment.
  • Interpret and apply the techniques and methods for the safe and effective termination and connection of: • thermosetting insulated cables including flexes • single and multicore thermoplastic (PVC) and thermosetting insulated cables • PVC/PVC flat profile cable • MICC (with and without PVC sheath) • SWA cables (PILC, XLPE, PVC) • armoured/braided flexible cables and cords • data cables • fibre optic cable • fire resistant cable..

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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 606 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 606 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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