NG TS 2.10.10 PDF

This document details mandatory prescriptive and functional requirements relating construction of new and, where suitable, modifications to existing buildings and associated infrastructure on 400kV and 275kV Gas Insulated Switchgear (GIS) substation sites and, where appropriate, Air Insulated Switchgear (AIS) substations. It is a development of, and shall be read in conjunction with, all relevant National Grid standards as appropriate.

For the purposes of this document it is assumed that a GIS or AIS substation comprises or more of the four distinct groups of buildings described below. These building units be used individually or in combination as necessary to achieve the project objectives. Design and configuration shall be as economic as possible whilst achieving the required levels of functionality and durability (i.e. design life). On new build projects all of the building groups may be utilised whilst at existing sites only certain elements may be required supplement existing facilities as necessary.

These requirements shall not necessarily apply to 132kV GIS Substation Buildings ( are generally elevated to facilitate cable entry and have to incorporate third organisations requirements, for example Distribution Network Operator (DNO) Companies) or multi-storey 400kV and 275kV GIS Substation buildings, for example those constructed areas prone to flooding. This document shall be supplemented with additional specifications for such installations however wherever practicable the principles contained herein shall adopted.

Barring the exceptions in 1.1.3 the requirements contained herein shall constitute the design standards for all GIS substation buildings and, where appropriate, the equivalent buildings on AIS substations. Project specific deviations from these principles may be permitted agreement with National Grid where it can be proven that they offer a better technical, economic and/or lower risk solution. All such deviations shall be fully discussed and agreed within timescales that do not adversely affect any of the project objectives and shall recorded in the design documentation appropriate to the project contract strategy.

Design work shall comply with all appropriate National Grid Technical Specifications (NGTS’s and TS’s), Design Handbooks, British Standards, European Standards and Codes of Practice as appropriate and be in accordance with recognised analytical methods. Where the requirements of this document or any other relevant project specifications are in conflict those specifically detailed within this document shall take precedence otherwise national Grid shall be informed and will instruct accordingly..