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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.
Distributed Generation Connection Guide: G98 & G99
Low voltage heat-shrinkable material components for use up to and including 600/1 000 V
Emergency rated system transformers 66/20.5 kV, 66/11.5 kV and 33/11.5 kV delta/star and star/star connected
Low voltage overhead line shrouding materials
Aerial Bundled Conductors Insulated with Cross-Linked Polyethylene for Low Voltage Overhead Distribution
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
Technical Requirements for Customers’ Export and Import Limitation Schemes
Specification for single circuit overhead pole lines for use at high voltage up to and including 33 kV
Guidance on the application of Engineering Recommendation P2, Security of Supply
Security of Supply
Environmental classification and corrosion protection of structures, plant and equipment
Structural testing of wood poles prior to climbing or use as a personal support
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)
Guidance on Neutral Current Diversion
400 V a.c. switchgear, controlgear and fusegear assemblies
Public Electricity Network Distribution Assemblies
Outdoor, free standing CTs & VTs up to 36 kV
Design and use of temporary scaffold guards and conductor support systems
Insulated Aerial Bundled Conductors for Low Voltage Overhead Distribution Systems – Erection Requirements
Covered-conductors for overhead lines (having rated Voltages Uo/U greater than 0.6/1 kV up to and including 19/ 33 kV)
Stay strands and stay fittings for overhead lines
Earth rods and their connectors
Environmental test requirements for protection and control equipment and systems
Application of ancillary electrical equipment
Standard numbering for small wiring (for switchgear and transformers together with their associated relay panels)
Engineering Recommendation G100 Issue 2 Overview and Summary Guide
Requirements for the Application of Protective Multiple Earthing to Low Voltage Networks
National Equipment Defect Reporting Scheme (NEDeRS®) – Notes of guidance
Overhead line conductors - protection against corrosion by the application of anti-corrosion grease during manufacture
Insulating foam-filled tube and solid rod for live working
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
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)
Partial discharge testing of bushings, capacitors, instrument transformers and switchgear of rated voltage 7.2 - 420 kV inclusive
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
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
Specification for single circuit overhead lines on wood poles for use at 132kV
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)
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
Use of Mechanical Harvesters in Vegetation Management
This document aims to give guidance on work using mechanical harvesting methods within 120 the Red Zone of live overhead power lines that is either instigated by the Network Operator 121 (for enhanced network security for example) or by a Third Party (usually commercial 122 harvesting). In either case these recommendations shall only be used where the work is 123 managed by the Network Operator. In this respect the Network Operator will assume the role 124 of Forestry Work Manager as defined in the FISA booklet, Guidance and Managing Health 125 and Safety in Forestry [N7]. The Network Operator then accepts responsibility for the 126 following tasks in respect of the work: 127 • Use information provided by the Landowner to prepare a risk assessment 128 • Select competent staff or contractors who have made adequate provision for health and 129 safety 130 • Make the machine and system choice 131 • Specify the health and safety measures for staff or contractors working on the site and 132 others who may be affected by the work activity 133 • Liaise with the Landowner 134 • Monitor health, safety and network security using a Network Operator Site Supervisor 135 who will be permanently on the site during work 136 It is recognised that when the Network Operator accepts the role of Forestry Work Manager 137 there will be instances where the work is happening concurrently with other work activities. In 138 these cases provision must be made to ensure that the safety and contractual responsibilities 139 of all parties are clear throughout the operations. Thorough consultation at the planning 140 stage between the Network Operator and the Landowner is essential. This document does 141 not seek to detail the variety of responsibilities that may need to be allocated nor does it seek 142 to give guidance on the collaborative process required to achieve this.
Medium revision to incorporate into the latest ENA template and review and capture any impact from changes in technology and tree harvesting machinery available. This issue includes the following principal technical changes.. Clause 7.3, bullet point 10: The requirement that there be no possibility of a machine being positioned such that it could breach the Vicinity Zone is relaxed to allow such positioning in exceptional circumstances. Guidance added on appropriate control measures to be put in place in such circumstances. Annex B, Hazard 2: Requirement that any operations requiring the machine to be positioned where it could breach the Vicinity Zone can only be done under the supervision of an SAP amended to allow this to be done alternatively by an appropriate Manager approved by the Network Operator.
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