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

Generation Sharing Guidance

Standard Pre-Qualification Procurement Process for Flexibility Services

Auxiliary multicore and multipair cables

Insulated Aerial Bundled Conductors For Low Voltage Overhead Distribution Systems – Conductor Fittings and Associated Apparatus

Insulator Binds and Equivalent Helical Fittings for Overhead Lines

Continuous Maximum Rated (CMR) system transformers (for use on systems up to 132 kV)

Tap-changers for system voltages up to and including 132kV

Occupational Health and Wellbeing Framework

Occupational Fatigue Management within ENA Electricity Networks Member Companies

Low voltage heat-shrinkable material components for use up to and including 600/1 000 V

DNO Common Network Asset Indices Methodology V2.1: Health & Criticality

Good Practice Guide to DNO Common Network Asset Indices Methodology V2.1
 

DNO CNAIM V2.0: Methodology Changes Explained

Emergency rated system transformers 66/20.5 kV, 66/11.5 kV and 33/11.5 kV delta/star and star/star connected

Partial discharge testing of bushings, capacitors, instrument transformers and switchgear of rated voltage 7.2 - 420 kV inclusive

Low voltage overhead line shrouding materials

Aerial Bundled Conductors Insulated with Cross-Linked Polyethylene for Low Voltage Overhead Distribution

  132 kV steel tower transmission lines: Specification L4(m)

Fasteners and Washers for Wood Pole Overhead Lines

Fault Passage Indicators up to 132kV for Underground and Overhead Distribution Systems

Operational procedure associated with electricity supplies for traction purposes on AC and DC electrified lines

Code of practice for the coordination of power line carrier system frequencies in the range 30•0 kHz to 526•5 kHz

Issue 3 - Amendment 8

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

Recommendations for the safe working of utilities’ staff and other parties near light rapid transit systems

Issue 1 – Amendment 10

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

Insulating foam-filled tube and solid rod for live working

Overhead line conductors - protection against corrosion by the application of anti-corrosion grease during manufacture

Guidance for the operation and management of fluid filled cables. This document replaces ETR 135.

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

Design and use of temporary scaffold guards and conductor support systems

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

Switchgear for use on 66 kV to 132 kV distribution systems (Disconnectors and earthing switches)

Measures necessary to minimise corrosion damage to buried metallic structures by neighbouring cathodic protection installations

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)

Structural testing of wood poles prior to climbing or use as a personal support

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

Type approval tests for mechanical connections to metallic sheaths of cables Addendu

Distribution transformers - Part 4 Pole mounted transformers

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

Switchgear for service up to 36 kV (Cable and Overhead conductor connected)

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