UNIT REVISION

City & Guilds 2357 Unit 315: Planning, preparing and installing wiring systems and associated equipment in buildings, structures and the environment (ELTP04) — Complete Revision Guide

A structured revision walkthrough of every topic in City & Guilds 2357 Unit 315 (Planning, preparing and installing wiring systems and associated equipment in buildings, structures and the environment (ELTP04)). 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 315 — Planning, preparing and installing wiring systems and associated equipment in buildings, structures and the environment (ELTP04) — 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 7 main topic areas.
  • 3Across the 7 topics there are 21 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 prepare the working environment for the installation of wiring systems, enclosures and associated 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.

  • Ensure the Health and Safety of themselves and others within the work location.
  • Identify and use suitable personal protective equipment throughout the completion of work activities.
  • Complete preparatory work for the installation of electrical systems, enclosures and associated equipment..
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02 · Unit Revision

Topic 2: Correctly interpret appropriate information for the installation of wiring systems, enclosures and associated 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 information and documentation that is current and relevant to the work required.
  • Use documentation to confirm that materials and equipment is of the correct quantity and is free from damage..
03 · Unit Revision

Topic 3: Confirm that planned work is in accordance with the installation specification

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 appropriate procedures to record: • contract variations • site instructions • site events/diary..
  • Demonstrate that authorisation has been obtained from the relevant person(s) prior to commencement of the work.
  • Produce a record of any pre work damage or defects to existing equipment or building features, and report to the relevant person (customer; client; site manager; line manager)..
04 · Unit Revision

Topic 4: Confirm the electrical supply is in accordance with the installation specification

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.

  • Verify the compatibility of the electrical supply to the requirements of the installation specification.
  • Identify the earthing arrangement for the electrical installation. Unit 315 Planning, preparing and installing wiring systems and associated equipment in buildings, structures and the environment (ELTP04).
05 · Unit Revision

Topic 5: Measure and mark-out the fixing and fitting locations for wiring systems, wiring-enclosures and equipment in accordance with current relevant 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.

  • Ensure that the planned locations for the wiring system(s) and its associated equipment are compatible with other site services requirements.
  • Use different measuring and marking out techniques which are appropriate to the wiring system, wiring enclosure and/or associated equipment that is being installed.
  • Ensure that the planned locations are visually acceptable and in accordance with the installation specification. 148 City & Guilds Level 3 Diplomas in Electrotechnical Technology (2357) Unit 315 Planning, preparing and installing wiring systems and associated equipment in buildings, structures and the environment (ELTP04).

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06 · Unit Revision

Topic 6: Fit and fix wiring systems, wiring enclosures and associated equipment safely in accordance with the installation specification

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.

  • Produce a planned programme of work for the fitting and fixing of wiring systems, wiring enclosures and associated equipment in accordance with: • a safe system of work • co-ordination with other site services • relevant regulations (e.g. IEE Wiring Regulations; building regulations) • installation specification • manufacturers' instructions.
  • Install the following in accordance with the IEE Wiring Regulations, the installation specification and agreed planned programme of work: • 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* *Evidence must be provided as a minimum for these cables.
  • Install the following in accordance with the IEE Wiring Regulations, the installation specification and agreed planned programme of work: • conduit (PVC and metallic)* • trunking (PVC and metallic)* • cable tray* • cable basket • ladder systems • ducting • modular wiring systems • Busbar systems and Powertrack * Evidence must be provided as a minimum for these five wiring systems and enclosures.
  • Determine the cable carrying capacity of conduit, trunking and ducting in accordance with the IEE Wiring Regulations and the installation specification.
  • Install the following types of electrical equipment and accessories, in accordance with the IEE Wiring Regulations, the installation specification, manufacturers' instructions and the agreed planned programme of work: • isolators and switches • socket-outlets • distribution-boards • consumer units. • earthing fault and over current protective devices • luminaires • control equipment • data socket outlets • auxiliary equipment (e.g. heating/water system components).
  • Dispose of unwanted material and equipment in accordance with site procedures and statutory requirements. 150 City & Guilds Level 3 Diplomas in Electrotechnical Technology (2357) Unit 315 Planning, preparing and installing wiring systems and associated equipment in buildings, structures and the environment (ELTP04).
07 · Unit Revision

Topic 7: Confirm any variations to the installation specification or planned programme of work

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 that, where variations to the installation specification and/or work programme have been identified, appropriate action has been taken after agreement of relevant persons (e.g. Customer; Client; Site Manager).
  • Verify that that the completed system meets specified requirements in terms of ensuring that components and equipment of the correct type, fit for purpose and are installed in accordance with the IEE Wiring Regulations, the installation specification and, as appropriate, with manufacturer instructions. Unit 315 Planning, preparing and installing wiring systems and associated equipment in buildings, structures and the environment (ELTP04) 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 of planning and selection for the installation of electrotechnical equipment and systems in buildings, structures and the environment (2357-604/ELTK4a) • Understanding the practices and procedures for the preparation and installation of wiring systems and electrotechnical equipment in buildings, structures and the environment (2357-605/ELTK4) • Understanding the electrical principles associated with the design, building, installation and maintenance of electrical equipment and systems (2357-609/ELTK08). Evidence requirements Learning.
08 · 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 315 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 315 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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