Annex 1 and Annex 2 Documents

Standards and other documents referenced in Annex 1 and Annex 2 of the Distribution Code are available for free and can be downloaded below:

Annex 1 Documents

1. Engineering Recommendation G5/4-1

Planning levels for harmonic voltage distortion and the connection of non-linear equipment to transmission and distribution systems in the United Kingdom

2. Engineering Recommendation G12/4-1

Requirements for the application of protective multiple earthing to low voltage networks

3. Engineering Recommendation G59/3-3

Recommendation for the connection of generating plant to the distribution systems of licensed distribution network operators

4(a). Engineering Recommendation P2/6

Security of Supply

4(b). P0-PS-037 (EM7907)

Distribution planning standards of voltage and of security of supply. (Parts of Scottish Hydro Electric Power Distribution Ltd Area)

5. Engineering Recommendation P14

Preferred switchgear ratings

6. Engineering Recommendation P24

AC traction supplies to British Rail

7. Engineering Recommendation P25, Issue 2 - 2018

The short-circuit characteristics of single-phase and three-phase low voltage distribution networks.

8. Engineering Recommendation P28

Planning limits for voltage fluctuations caused by industrial, commercial and domestic equipment in the United Kingdom

9. Engineering Recommendation P29

Planning limits for voltage unbalance in the United Kingdom for 132kV and below

10. Technical Specification 41-24 November 2009

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

11. Engineering Recommendation S34

A guide for assessing the rise of earth potential at substation sites

12. Engineering Recommendation G83/2

Recommendations For The Connection of Type Tested Small-Scale Embedded Generators (Up To 16 A Per Phase) In Parallel With Public Low-Voltage Distribution Networks

Annex 2 Documents