Document No. Z914 – C36000245 Ver. 1
Hand Book for Electronic Interlocking model K5BMC - Installation, Maintenance & Trouble Shooting -
25. Apr. 2014 P- 96/123
9. Relay rack
The racks shall install adequate space to house fuse boxes of 1.6 Amp and 0.6 Amp for each
circuit protection of non deteriorating type from standard manufacturer. All mounting of fuses
shall be on insulated fire proof sheet of suitable material to provide electrical isolation. The
racks shall be insulated from the ground to prevent any external extraneous feeding of
unwanted supply. It shall have anti vibration pads.
The rack shall provide sufficient strength and coated with anti corrosive paint, Enameled paint
for preventing corrosion, rust. Installation of capacitors and resistors shall be provided on racks
for holding power to external devices i.e. point machine. Proper rating of such devices is
essential for functioning of circuits. Inter racks wiring shall be through Tag Block.
9.1 Wiring practices
Ladders:
Cable ladders insulated horizontally shall have sufficient space to facilitate cable
pulling and cleating /stapping.
It is isolated from racks and wall via rubber bush & hylum sheet. All power cables
and I/O cables & interconnection wires shall run different ladders. Ladder width
shall be 2/3rd of rack width and it is ensured that it carries fewer amounts of cables
& avoid bends / damages.
Maximum distance between the supports is provided every 3 meters.
All surfaces are cleaned prior to bolting together.
Cables runs:
All the cable / wire run will have smooth surface.
Sharp bending will be avoided when coming to racks. Cable entry holes in the Racks
will have correct size rubber beedings. Ladders will be used for Interconnection of
cable runs.
PVC Troughs with cover will be used for Intra- connections.
Cable systems:
Cable shall be separated into Power cable, Communication cable, I/O cable and
Panel cable. Sufficient cable spare length shall be provided for equipment, which
needs future adjustment.
Cable splicing shall be avoided. Cable insulated resistance must be 20 mega ohms.
Cable should be arranged properly for maintenance.
Clean wiring:
Wires carrying extremely small currents that are prone to EMI and other disturbance.
Dirty wiring:
Wires regularly carrying large varying currents or currents that are subjected to EMI
or other disturbance caused transient conditions which can couple with adjacent
wiring. Dirty wiring will be separated as much as possible from clean wiring.
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