Ground Mounted Distribution Substation 12 to 24 kV Rated RMU & Extensible Switchgear

Information Exchange between Distribution
Network Operators

Connections in Constrained Areas:
Technical Guidance on the Options for
Managing Curtailment at the Boundary
between Network Operators

Live Tank Circuit Breakers to use on 400 kV Transmission System

Guide to the Application of Engineering Recommendation P28 Issue 2

Functional Test Requirements – Transformer Differential Protection

Functional Test Requirements – Voltage Protection

Protection of telecommunication lines from power lines

Engineering Technical Report 132 Issue 3 2025 Improving resilience of overhead networks under storm conditions.

Application Guide for Wildlife Protection Schemes for HV Overhead Lines

Reporting of incidents to the Health and Safety Executive (HSE) in accordance with regulation 31 of the Electricity Safety, Quality and Continuity Regulations 2002 (ESQCR)

Functional Test Requirements – Busbar Protection Relays

Managing the Risks Associated with the Provision of Multiple Connections in Close Proximity

Standard Application Form - Connection of Power Generating Modules to DNO Distribution Networks in accordance with EREC G99

Wildlife Protection Product Specification for HV Overhead Lines

Safe Working on the Low Voltage Electrical Distribution System

Power Quality Information Required for Heat Pumps and their Assessment

Working in or Near Water (including Flood Water)

Voltage Measurements for Assessment of Compliance with Statutory Voltage Limits

Instructions for Reporting to the National Fault and Interruption Reporting Scheme

Guide to the practical aspects of quality management associated with assessment of power system plant & products

Guide to the assessment of power system products for use by the ENA Member Companies

Part 2D: Procedure for the conformity assessment of protection products

Requirements for the connection of Fully Type Tested Micro-generators (up to and including 16 A per phase) in parallel with public Low Voltage Distribution Networks on or after 27 April 2019

EREC G98 Application Forms

Distributed Generation Connection Guide: G98 & G99

Requirements for the connection of generation equipment in parallel with public distribution networks on or after 27 April 2019

EREC G99 Application Forms

Separation between Wind Turbines and Overhead Lines: Principles of Good Practice

Code of practice for overhead to underground optical cable connections

Code of practice for the installation of ADSS optical cable

Post Trip Manual Reclosing of High Voltage Electrical Distribution Circuits

Post Trip Manual Reclosing of High Voltage Electrical Distribution Circuits

Distribution Network Operator Response to Reports of Low or Grounded Overhead Lines

Testing approach for merging units for protection sampling of instrument transformers in accordance with BS EN IEC 61869-13

Telecommunication Providers and Distribution Network Operators joint use of poles

Design and use of temporary scaffold guards and conductor support systems

Distribution cables of rated voltage 0.6/1/ (1.2) kV with XLPE insulation, concentric waveform copper wire and solid aluminium conductors

Environmental test requirements for protection and control equipment and systems

Guidelines for the Provision of Low Voltage Connections to Multiple Occupancy Buildings

Switchgear for use on 66 kV to 132 kV distribution systems Part 5 Inductive voltage transformers, capacitor voltage transformers, combined unit transformers and current transformers for use on 72.5 kV to 145 kV distribution systems

Power installations exceeding 1 kV a.c. – Design of high-voltage open-terminal stations

Aerial bundled conductors insulated with cross-linked polyethylene for low voltage overhead distribution

Specification for single circuit overhead lines of compact covered construction on wood poles for use at high voltage up to and including 33 kV

XLPE covered-conductors for overhead lines (having rated voltages Uo/U greater than 0.6/1 kV up to and including 19/33 kV)

Single core cables for use in substations having extruded insulation and rated voltages of 6350/11 000 volts, and 19 000/33 000 volts

Environmental classification and corrosion protection of structures, plant and equipment

Fittings for covered conductors for overhead lines (having rated voltages U0/U greater than 0.6/1 kV up to and including 19/33 kV)

Portable earthing equipment for overhead lines and substations

Complexity of Distribution Circuits Operated at or above 22kV

Stay strands and stay fittings for overhead lines

Guide to the application of Engineering Recommendation G5/4 in the assessment of harmonic voltage distortion and connection of non-linear equipment to the electricity supply system in the U.K

Calculation of fault currents in three-phase AC power systems (Application Guide to Engineering Recommendation G74)

Standard Application Form - Connection of Power Generating Modules to DNO Distribution Networks in accordance with EREC G99

Requirements for the connection of Fully Type Tested Micro-generators (up to and including 16 A per phase) in parallel with public Low Voltage Distribution Networks on or after 27 April 2019

EREC G98 Application Forms

Distributed Generation Connection Guide: G98 & G99

Requirements for the connection of generation equipment in parallel with public distribution networks on or after 27 April 2019

EREC G99 Application Forms

Issue 3 - Amendment 8

Recommendations for the Connection of Generating Plant to the Distribution Systems of Licensed Distribution Network Operators

Engineering Recommendation G99/NI Issue 1 – Amendment 1
7 December 2023
Requirements for the connection of generation equipment in parallel with public distribution networks in Northern Ireland on or after 27 April 2019
 

Guidance on the application of Engineering Recommendation P2, Security of Supply

Security of Supply

Requirements for the Application of Protective Multiple Earthing to Low Voltage Networks

Complexity of Distribution Circuits Operated at or above 22kV

Analysis package for assessing the security contribution from distributed generation and electricity storage systems – Users’ guide

Analysis Package For Assessing Generation Security Capability - Users' Guide

Harmonic voltage distortion and the connection of harmonic sources and/or resonant plant to transmission systems and distribution networks in the United Kingdom

AC traction supplies to British Rail

Issue 2 Amendment 3 
Recommendations for the Connection of Type Tested Small-scale Embedded Generators (Up to 16A per Phase) in Parallel with Low-Voltage Distribution Systems

Issue 1 Amendment 4 
Requirements for the connection of generation equipment in parallel with public distribution networks on or after 27 April 2019

Voltage fluctuations and the connection of disturbing equipment to transmission systems and distribution networks in the United Kingdom

Guidelines for the design, installation, testing and maintenance of main earthing systems in substations

A guide for assessing the rise of earth potential at electrical installations

Framework for new low voltage housing development installations - Part 1 Design and planning

Framework for new low voltage housing development installations - Part 2 Materials specification

Framework for new low voltage housing development installations - Part 3 Installation and records

Framework for new industrial and commercial underground connections - Part 4 Design and planning

Framework for new industrial and commercial underground connections - Part 5 Materials specification

Framework for new industrial and commercial underground connections - Part 6 Installation and records

Framework for contestable diversionary and reinforcement works not exceeding 33 kV - Part 7 Contestable diversionary and reinforcement works

Guidelines for the Provision of Low Voltage Connections to Multiple Occupancy Buildings