The requirement of cable conduction is to be determined depending upon the circuits run from CT Room /Relay room function. Separate cable line wise and if necessary, function wise are laid from relay room /CT room to facilitate easy testing of cable without much distraction to the traffic.

Cable size to be determined by keeping spare conductors to a minimum of 20% of total conductors used inn, each cable wiring between the outermost facing point of the station and a minimum of 10% of the total conduction used in the each cable working beyond the points area upto the signals. The approximate cable requirement for a typical four a line station on a double line section and a 3 line station on a single line section.

Type of cable                         Double line                Single line
Signalling cable 24 core                9 kms.                            1 kms
Signalling cable 19 core               10.6 kms.                       2.4 kms
Signalling cable 12 core               10.5 kms                        12.7 kms
Signalling cable 6 core                  5.7 kms.                        3.3 kms
Power cable 10 Sq                          8.6kms.                         7.7 kms

(Aluminum conductor)

Numbering of cable is done in ascending order right hand side of the cable core distribution plan

A cable distribution plan for a 4 line station on a double-line section is attached for reference.