Page 399 - IRSEM_Main Book

(iv) On single line track circuited sections, a continuous earth wire is
provided on the traction mast capable of carrying full traction return
current. The uninsulated rail shall be connected to each of the traction
masts by a structure bond, which shall be riveted at both ends. The
arrangement for Double Line and Single Line Sections is as illustrated
in given at Drg No.17-D3.

(v) Typical bonding examples with single rail track circuits are shown in
Drg No.17-D3.

(d) Double Rail Track Circuits

(i) No structure bonds, cross bonds or connections to earth wires or
return conductors shall be connected to the running rails where double
rail track circuits are in use. If necessary, an impedance bond must be
specially installed to provide a neutral point for these connections.

(e) Types of Bonds in RE Area

(i) Rail Joint Bonds: Rail joints in track circuited areas shall be bonded
using two 8 SWG bare galvanized steel wires or copper bonds/steel
wires or flats secured by means of channel pins or welding/riveting.
The S&T department is responsible for the installation and the
maintenance of all rail joint bond.

(ii) Rail bonds and Cross bonds: Where rail bonds and cross bonds are
required for traction return purposes they shall be installed by and
remain the responsibility of the electrical department.

(iii) The longitudinal bonding on a non track circuited track adjacent to a
track circuit shall be extended for a distance of 50 meters beyond the
track circuit.

(iv) In addition, the two rails of the non-track circuited track outside any
track circuit or in between two track circuits shall be bonded together
immediately after the block joints.

(v) It is essential that the traction return and track circuit bonding is
maintained in its design condition. The SSE/JE (Traction) and SSE/JE
(Signal) of section will arrange for physical inspection at six months
intervals to ensure conformity with approved Bonding Plan. In the
event of faulty connection or bond being found immediate remedial
action will be taken to restore system Integrity. The results of the joint
inspections shall be entered in a register maintained by the SSE/JE
(Signal) and put up within a month for the scrutiny of the Sr. Divisional
Signal and Telecommunication Engineer/Sr.Divisional Electrical
Engineer (OHE). Responsibility of maintenance of traction bonds is
with electrical department.

(vi) Detailed instructions for bonding of track are given in the AC Traction
Manual.

Chapter 17: Train Detection Track Circuits & Axle Counters Page 347 of 535