Page 184 - IRSEM_Main Book

Section 8: An overview – Design, Installations, Testing,
Commissioning & Maintenance of Signalling Equipment

7.8.1 Design & Installations

(a) The signalling and interlocking arrangements for the yard shall be in
accordance with the approved signalling plans, Control Table, detailed
wiring diagram including Control Panel diagram, Relay contact analysis
and relay rack arrangements.

(b) Criteria for Design of Signalling circuit is given in Chapter 21, Section 1.

7.8.2 Outdoor signalling equipment to be Installed, Tested & Maintained as
given below

(a) LC Gates as per Chapter 14 of SEM.

(b) All signalling cables shall be laid, Tested as per Chapter 15 of SEM.

(c) Train Detection: Track circuits, AFTC, Axle Counters as per Chapter 17 of
SEM.

(d) Signals, IRS Point Machines, Thick web switches as per Chapter 19 of SEM.

7.8.3 Power Supply & suitability for RE area for equipment and circuitry shall
be as given below:

(a) Power Supply Arrangements: Power supply systems for Signalling
Installations shall be as per Chapter 16 of SEM.

(b) All signalling equipment and circuitry shall comply with stipulations given
in Chapter 22 of SEM on "Requirements of signalling in 25 KV AC
electrified areas".

7.8.4 Block Instruments, Lightning and surge protection & Earthing, General
Arrangements as given below:

(a) Block Instruments (where separately required) shall be Installed, Tested,
Commissioned & Maintained as per Chapter 18.

(b) Lightning and surge protection shall be provided to protect Electrical &
electronic signalling equipments from lightning & surges as per Chapter
21, Section 7.

(c) Earthing for Outdoor signalling equipment as per Chapter 19, Section 11.

(d) General Arrangements in Relay Room: Air conditioning, 'Automatic Fire
Detection and Alarm System', Automatic Fire Suppression System' etc
shall be as per Para 21.3.4.

Chapter 7: Essentials of Signalling Page 153 of 535