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City & Guilds Level 2 Diploma in Network Construction Operations – NCO2 GAS Main Layer

Course Duration:
Ten Days
Format:
Location:
Home > Training Courses > NCO Gas & Water Training Courses > City & Guilds Level 2 Diploma in Network Construction Operations – NCO2 GAS Main Layer

Course Overview

The City & Guilds Level 2 Diploma in Network Construction Operations (NCO2) – Gas Main Layer equips operatives with the technical skills and knowledge required to install, maintain, and commission gas mains on the public network. Building on the foundation learned in NCO1, this qualification develops practical competence in excavation, pipe-laying, jointing, testing, and reinstatement, while reinforcing essential safety practices and regulatory compliance.

Delegates gain hands-on experience in both classroom and field environments, learning to interpret construction drawings, operate tools and plant safely, and work effectively within teams on live gas network projects. This Level 2 qualification is recognised by the Energy & Utility Skills Register (EUSR) and forms a key step in progressing to advanced operational or supervisory roles within the gas network sector.

Course Duration:
Ten Days
Format:
Location:
Book Course

Certification Awarded

City & Guilds NCO2 Gas Main Layer

Valid for

Five Years

Awarding Body

City & Guilds Approved Centre

Who should Attend This Course

Gas operatives progressing from NCO1 to main layer responsibilities
Individuals working on gas main construction or maintenance
Employers seeking formal qualification pathways for gas network staff
Candidates seeking recognised certification to work on live gas mains

Prerequisites

  • Good understanding of spoken and written English.
  • Valid form of ID
  • While prior experience in the gas industry is beneficial, it is not mandatory. However, candidates must obtain the EUSR Safety, Health, and Environmental Awareness (SHEA) Gas Passport before accessing construction sites. ​

What To Have With You To Attend The Course

Photo ID

Assessment

Assessment is by means of practical site assessments, written tasks, and portfolio evidence.

Course Content

The NCO2 Gas Main Layer programme covers the essential knowledge and practical skills required to safely and effectively install and maintain gas mains, including:

Gas Main Installation Fundamentals

  • Understanding mains pipeline systems, components, and specifications
  • Selecting and handling approved materials and components
  • Reading and interpreting construction drawings and site plans

Excavation, Support & Reinstatement

  • Preparing and excavating trenches safely
  • Implementing shoring, support, and reinstatement procedures
  • Maintaining compliant and safe work areas

Pipe-Laying, Jointing & Connections

  • Installation of gas mains using approved jointing methods
  • Connections to existing network infrastructure
  • Commissioning and testing mains installations

Testing & Purging

  • Pressure testing procedures for newly installed mains
  • Purging and preparing the system for safe operation
  • Identifying and rectifying defects or faults

Site Safety & Compliance

  • Working safely near live gas systems
  • Hazard identification, risk assessment, and environmental controls
  • Adhering to regulatory, legislative, and company standards

Operational Competence

  • Using powered tools, hand tools, and small plant safely
  • Coordinating with supervisors, colleagues, and contractors
  • Maintaining clear and accurate documentation for site works

Progression Opportunities
Completion of NCO2 Gas Main Layer enables progression to:

  • Supervisory roles within gas network operations
  • Advanced technical or specialist positions in mains and service construction
  • Further NCO or engineering qualifications within the utility sector

Frequently Asked Questions

What is the NCO2 Gas Main Layer qualification?
A Level 2 City & Guilds diploma that certifies your ability to install, maintain, and test gas mains on the public network.

Do I need NCO1 before enrolling?
Yes. You must hold an NCO1 Gas Assistant qualification or demonstrate equivalent experience.

How long does the course take?
The training and assessments usually span several weeks and include both centre-based learning and on-site practical assessment.

Is this qualification recognised by the industry?
Absolutely. It’s City & Guilds accredited and aligns with EUSR and utility contractor requirements.

Does this course include service laying?
No, this course focuses exclusively on gas main laying. For service layer training, please refer to our dedicated NCO2 Service Layer course.

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