scope:

This standard applies to:

a) general installation techniques;

b) the installation of signalling works applicable to the Infrastructure, including temporary works; and

c) the installation of specific types of signalling systems and equipment, but not the trainborne parts of track-to-train systems.

This standard also applies to maintenance work and repairs, including like-for-like replacement of equipment. However, reference shall also be made to the appropriate maintenance standards and Signal Maintenance Testing standards. This standard does not cover:

a) the manufacture of individual items of equipment;

b) the installation of trainborne equipment; or

c) Equipment ordering details and processes.

The presentation of design detail is the subject of NR/L2/SIG/11201.

The testing of signalling works is covered by NR/L2/SIG/30014. The modules which form part of this specification represent the best historical practice for signalling installation which should be followed unless specified in other standards or approved as a superior practice by the responsible signalling project engineer.

An index of the modules is contained in Appendix A with a topic index in Appendix B.

Purpose

This standard requires that any installation of signalling equipment on Network Rail Managed Infrastructure provides:

a) an operationally safe installation of new or altered systems and equipment, with safe interfaces between systems;

b) that safe methods of work are adopted, with safe interfaces between all parties involved or affected;

c) a correct and consistent interpretation of design detail;

d) a neat and tidy appearance;

e) compliance with the client's specified requirements, so that the installation is dependable, fit for purpose and free from defect;

f) adequate testability; and

g) safe and easy maintenance.