Engineering Documents

ENA is responsible for maintaining the industry developed and published Technical Specifications (TS), Engineering Recommendations (ER) and Engineering Technical Reports (ETR). Over 400 such publications can be purchased from the ENA engineering document catalogue.

Click here to go to the ENA Engineering Document Catalogue

Customers may purchase PDF versions of ENA engineering documents for delivery by email. Full ENA members may request documents without charge. If you have any questions, please contact [email protected].

Distribution Code

Standards and other documents referenced in Annex 1 and Appendix 2 of the Distribution Code have now been made available for free electronic download. These documents can be found on the Distribution Code website at the following link - Distribution Code website 

Distributed Generation

ENA Distributed Generation connection guidance, application forms and associated documents such as the ER G83 Stage 1 and Stage 2 and ER G59 documents can be found on our Distributed Generation page.

Free ENA Engineering Documents

The publications below are free to download and use. Please note that these engineering documents remain ©Energy Networks Association and must not be altered in any way.

ENA ER G85 Issue 2 - December 2007
Innovation in Electrical Distribution Networked Systems: A Good Practice Guide.

ENA ER G81 Part 1 (Design and Planning) Issue 3 - April 2016
Framework for design and planning, materials specification, installation and record for low voltage housing development installations and associated new HV/LV distribution substations.

ENA ER G81 Part 2 (Materials Specification) Issue 2 - April 2016
Framework for design and planning, materials specification, installation and record for low voltage housing development installations and associated new HV/LV distribution substations.

ENA ER G81 Part 3 (Installation Records) Issue 2 - April 2016
Framework for design and planning, materials specification, installation and record for low voltage housing development installations and associated new HV/LV distribution substations.

ENA ER G81 Part 4 (Design and Planning) Issue 3 - April 2016
Framework for design and planning of industrial and commercial underground connected loads up to and including 11kV.

ENA ER G81 Part 5 (Materials specification) Issue 2 - April 2016
Framework for materials specifications for industrial and commercial underground connected loads up to and including 11kV.

ENA ER G81 Part 6 (Installation and Records) Issue 2 - April 2016
Framework for Installation and Records of Commercial and Industrial Underground Connected Loads up to and including 11kV.

ENA ER G81 Part 7 (Contestable Diversionary and Reinforcement Works) Issue 2  - April 2016
Framework for contestable diversionary and reinforcement underground and overhead works not exceedng 33kV and HV/LV distribution substations.

ENA ETR 136 Issue 1 - June 2007
Vegetation management near electricity equipment - Principles of good practice.