NG TS 2.19 PDF

PURPOSE AND SCOPE

Informative: Throughout this document reference is made to National Gird Specifications. For the avoidance of doubt all references to within this document to Technical Specifications (TS) can be taken to mean either National Grid Technical Specification (NGTS) or Technical Specification (TS) as appropriate.

This Specification defines the requirements for ancillary light current equipment at National Grid owned substations. This Specification is part of a hierarchical structure of documentation comprising three levels of Functional Specification. This Document is a Level two Specification.

This specification describes the overall functional and performance requirements for all ancillary light current equipment for use in substations, including equipment used in conjunction with protection, control, monitoring and metering systems and ancillary equipment associated with primary plant. It covers the requirements for:

• Light current equipment, auxiliary switches and indicators

• Cubicles, boxes and kiosks

• Marshalling

• Earthing of light current equipment

• Marking and labelling

• Components and accessories

• Interposing relays

• Testing facilities

Additional requirements may also apply depending on the light current system application and reference should be made to the appropriate Level 2 or Level 3 Technical Specification.