Electrical standards documents

Here you will find the electrical standards documents including specifications for electronic data communications facilities that apply to transmission-connected generators in England, Wales, and Scotland. 

 Please use the table below to see which standards apply to your connection.

  RES SPT SHE Transmission EDL/EDT Control Telephony
Directly connected in England & Wales ✔     ✔ ✔
Directly connected in SPT’s area   ✔   ✔ ✔
Directly connected in SHE Transmission’s area     ✔ ✔ ✔
Embedded BM Participant       ✔ ✔

RES = Relevant Electrical Standards 
SPT = Scottish Power Transmission 
SHE = Scottish Hydro Electric Transmission    
EDL = Electronic Dispatch Logging 
EDT = Electronic Data Transfer

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Raising a change and further help

The process for raising changes to the electrical standards is in paragraph 11 of the general conditions of the Grid Code. If you are interested in raising a change to the electrical standards, please contact the Grid Code Review Panel Secretary in the first instance at [email protected] 

You can find further details in the RES Guidance Document.

If you need access to the GB Transmission System National Grid Technical Specifications, please contact the team at [email protected].

England and Wales electrical standards

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Please note that the titles and any references within these standards may use or omit leading zeroes interchangeably for ease of sorting. So for example, TS2.01 and TS2.1 refer to the same document.

Name Published
Control Telephony Standard Issue 3 4 Mar 2024
Communications Standards for Electronic Data Communication Facilities and Automatic Logging Devices v8 4 Mar 2024
System Defence Plan Issue 5 4 Mar 2024
System Restoration Plan Issue 5 4 Mar 2024
BACK-UP PROTECTION GRADING ACROSS NATIONAL GRID / DISTRIBUTION NETWORK OPERATOR INTERFACES AND OTHER THIRD PARTIES - PS(T)010 (RES) 20 Dec 2019
Back Up Protection Grading Across Interfaces 21 Nov 2019
Gas Insulated Switchgear TS_3.02.014_Res_12 24 Dec 2018
Relevant Electrical Standards - RES i3 16 Jul 2018
Substations - TS 2.01 Part 1 RES i1 16 Jul 2018
Substation Interlocking Schemes - TS 3.01.01 RES i1 16 Jul 2018

Specifications for electronic data communications facilities

Name Published
EDL Instruction Interface Valid Reason Codes - 7 November 2024 7 Nov 2024
Distribution Restoration Zone Control System (DRZCS) Standard 4 Jun 2024
EDL Message Interface Specification Issue 6 26 Oct 2020
MODIS Interface Specification (Version 4) 14 Mar 2016
Data Validation, Consistency and Defaulting Rules Issue 9 3 Dec 2014
EDT Submitter Guidance Notes 3 Apr 2014
Electronic data transfer (EDT) Interface Specification Issue 4 3 Apr 2014

Electrical standards for the SHE transmission system

Name Published
SHE_NGTS 1 - Rating and General Requirements 17 Jul 2014
SHE_NGTS 2_6 - Protection 17 Jul 2014
SHE_NGTS 3_2_1 - Circuit Breakers and Switches 17 Jul 2014
SHE_NGTS 3_2_4 - Current Transformers for protection 17 Jul 2014
SHE_NGTS 3_2_6 - Current and Voltage Measurement 17 Jul 2014
SHE_NGTS 3_2_9 - Post Insulators for Substations 17 Jul 2014
SHE_NGTS 2_1 - Substations 17 Jul 2014
SHE_NGTS 3_1_1 - Substation Interlocking Schemes 17 Jul 2014
SHE_NGTS 3_2_3 - Metal-Oxide surge arresters 17 Jul 2014
SHE_NGTS 3_2_5 - Voltage Transformers 17 Jul 2014