Page 291 - IRSEM_Main Book

(c) Route holding arrangements for facing or trailing points are however not
necessary, if due to the manipulations required in the system of control, it
is impossible under normal working conditions for the Points to be
operated before the train has passed.

Section 6: Signal Wire Run

12.6.1 Single Wire/Rope

(a) Galvanised steel wire strand No.7/1.40 mm (dia) to IS Specification No.
2265, or galvanized solid steel wire 3.35 mm (dia) to IRS Specification
No. Sl62, shall be used for signal connections.

(b) Coils of wire shall be run out from a creel. Twists, kinks and nicks shall be
avoided.
12.6.2 Galvanized wire rope: Galvanized steel wire rope for signalling purposes
ordinarily used for single wire runs shall be to IRS Specification No. S-3.

12.6.3 Wire rope round wheels: Wire rope when used for making turns on wheels
shall not be less than 2 meter in length.

12.6.4 Wire rope on cabin wire adjusters: Wire rope when used on cabin wire
adjusters and draft wheels shall be in a continuous length.

Section 7: Painting of Mechanical Signalling

12.7.1. Equipment to be painted: The following are the main items of mechanical
signalling equipment that need regular painting:
(a) Signal arms, Point Indicators, boards and markers;

(b) Signal posts and Signal fittings;

(c) Interlocking frames, their levers & fittings;

(d) Ground and miscellaneous gear, such as rodding, guide roller assembly,
cranks, compensators, turnout wheels;

(e) Lifting barriers, if maintained by Signal and Telecommunication department.

12.7.2 Colouring Scheme: Items detailed in Para:12.7.1 shall be painted in
accordance with colouring scheme shown for the respective item as in Drg
No:12-D1.

12.7.3 Interval of Painting: The general principles for fixing intervals shall be the
following:

(a) Signal arms, indicators etc. which are required to be painted to
conventional shapes and/or colours shall be painted once a year.
(b) Signal posts which are to be kept conspicuous and cabin levers which are
to be distinguished by colours, shall be painted once in three years;

(c) Rodding, guide roller assembly etc. which only need a protective
covering, shall be painted once in six years.
Note: The intervals mentioned above may be reduced in areas where, on account of
weather or other local conditions painting at shorter intervals is necessary.

Chapter 12: Installation, Testing & Maintenance of Mechanical Signalling Equipment Page 245 of 535