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The Energy Networks Association (ENA) represents the interests of all energy companies in the UK. The Document Catalogue System is an online catalogue of engineering documents available from the ENA.
Documents available from the site include Technical Specifications, Engineering Recommendations and Reports, BEBS Specifications and reports supporting the electricity network process and policies.
Most documents are available to anybody but a small number are confidential to ENA member companies and can only be accessed by those member companies. The system allows clients that are not full ENA members to purchase documents by credit/debit card via secure transactions provided by WorldPay.
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WARNING! Some of the older (pre 2003) documents available on this site were originally published by the now defunct Electricity Association. Please note that the ENA cannot take responsibility for the condition and content of these older documents and you are advised to seek advice before acting upon information held in them.
Specification for single circuit overhead pole lines for use at high voltage up to and including 33 kV
Insulated Aerial Bundled Conductors for Low Voltage Overhead Distribution Systems – Erection Requirements
Emergency rated system transformers 66/20.5 kV, 66/11.5 kV and 33/11.5 kV delta/star and star/star connected
400 V a.c. switchgear, controlgear and fusegear assemblies
Public Electricity Network Distribution Assemblies
Low voltage overhead line shrouding materials
Low voltage heat-shrinkable material components for use up to and including 600/1 000 V
Stay strands and stay fittings for overhead lines
Operational procedure associated with electricity supplies for traction purposes on AC and DC electrified lines
Fault Passage Indicators up to 132kV for Underground and Overhead Distribution Systems
Application of ancillary electrical equipment
Overhead line conductors - protection against corrosion by the application of anti-corrosion grease during manufacture
Recommendations for the safe working of utilities’ staff and other parties near light rapid transit systems
Code of practice for the coordination of power line carrier system frequencies in the range 30•0 kHz to 526•5 kHz
Environmental classification and corrosion protection of structures, plant and equipment
Covered-conductors for overhead lines (having rated Voltages Uo/U greater than 0.6/1 kV up to and including 19/ 33 kV)
Environmental test requirements for protection and control equipment and systems
Design and use of temporary scaffold guards and conductor support systems
Earth rods and their connectors
National Equipment Defect Reporting Scheme (NEDeRS®) – Notes of guidance
Tests on power cables with XLPE insulation and metallic sheath and their accessories, for rated voltages of 66 kV (Um = 72.5 kV), 110 kV (Um 123 kV) and 132 kV (Um = 145 kV)
Standard numbering for small wiring (for switchgear and transformers together with their associated relay panels)
Outdoor, free standing CTs & VTs up to 36 kV
Structural testing of wood poles prior to climbing or use as a personal support
Aerial Bundled Conductors Insulated with Cross-Linked Polyethylene for Low Voltage Overhead Distribution
Distributed Generation Connection Guide: G98 & G99
Issue 1 – Amendment 10
Requirements for the connection of generation equipment in parallel with public distribution networks on or after 27 April 2019
Issue 3 - Amendment 8
Recommendations for the Connection of Generating Plant to the Distribution Systems of Licensed Distribution Network Operators
Technical Requirements for Customers’ Export and Import Limitation Schemes
Guidance on the application of Engineering Recommendation P2, Security of Supply
Security of Supply
Guidance on Neutral Current Diversion
Engineering Recommendation G100 Issue 2 Overview and Summary Guide
Requirements for the Application of Protective Multiple Earthing to Low Voltage Networks
Switchgear for service up to 36 kV (Cable and Overhead conductor connected)
Calculation of fault currents in three-phase AC power systems (Application Guide to Engineering Recommendation G74)
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
Specification for single circuit overhead lines of compact covered construction on wood poles for use at high voltage up to and including 33 kV
Guidance for the operation and management of fluid filled cables. This document replaces ETR 135.
Single core cables for use in substations having extruded insulation and rated voltages of 6350/11 000 volts, and 19 000/33 000 volts
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)
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
Type approval tests for mechanical connections to metallic sheaths of cables Addendu
Power installations exceeding 1 kV a.c. – Design of high-voltage open-terminal stations
Portable earthing equipment for overhead lines and substations
Specification for single circuit overhead lines on wood poles for use at 132kV
Insulating foam-filled tube and solid rod for live working
XLPE covered-conductors for overhead lines (having rated voltages Uo/U greater than 0.6/1 kV up to and including 19/33 kV)
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
Distribution transformers - Part 4 Pole mounted transformers
Partial discharge testing of bushings, capacitors, instrument transformers and switchgear of rated voltage 7.2 - 420 kV inclusive
Distribution cables of rated voltage 0.6/1/ (1.2) kV with XLPE insulation, concentric waveform copper wire and solid aluminium conductors
Aerial bundled conductors insulated with cross-linked polyethylene for low voltage overhead distribution
Guidelines for the Provision of Low Voltage Connections to Multiple Occupancy Buildings
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
Amendment 7
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
EREC G99/NI - Northern Ireland Only
Requirements for the connection of generation equipment in parallel with public distribution networks in Northern Ireland on or after 27 April 2019
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
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