Page 519 - IRSEM_Main Book

21.6.2 Specific tests for Electronic interlocking

(a) Maintenance of Electronic Interlocking system shall be done as per
approved system maintenance manuals. A general maintenance schedule
for Electronic interlocking is provided for guidance at Annexure: 21-MS3 in
Appendix I.

Note: At stations having dense traffic and high speed, the Railways may prescribe
more frequent inspections, if considered necessary.

(b) Maintenance Terminal of Electronic Interlocking system shall be provided
in the Signal Technician Duty room.

(c) Latest E.I station database files (application logic, Control Terminal
database, etc.) shall be kept updated in centralized server as specified.

(d) Periodic testing of redundant systems shall be carried out. Checksums
shall be verified during periodic inspections.

(e) Additional References for Electronic Interlocking.

(i) Relevant International Standards (or equivalent standards) with latest
revisions are alsoapplicable to development and implementation of
safety related railway signalling systems and projects including
Electronic Interlocking. IEC stands for “International Electro technical
Commission” and CENELEC stands for “European Committee for
Electro technical Standardization”.
(ii) RDSO Specifications and Technical Advisory Notes (TAN) with latest
amendments are applicable for design, installation, testing and
maintenance of Electronic System.

Section 7: Lightning & Surge Protection for Signalling
Equipments

21.7.1 Lightning - General: Lightning and surge protection shall be provided to
protect Electrical & electronic signalling equipments from lightning & surges.

(a) S&T equipment shall be protected as per National Building Code 2016
(NBC 2016) and IEC 62305. S&T equipment, including those given below,
are to be grounded and protected from lightning surges. Code of Practices,
Technical Advisory Notes, Guidelines issued by RDSO on the subject shall
be taken into consideration.

(i) Electronic Interlocking Installations including Object Controllers.

(ii) BPAC Systems, Axle Counter Systems, Integrated Power Supply
Systems.

(b) Equi-potential bonding to be provided for all the equipment for effective
lightning and surge protection in Signal Equipment Rooms.

(c) External Lightning Protection and Class/Type I, II & III devices are to be
provided at;

Chapter 21: Relay & Electronic Interlocking Page 462 of 535