Page 407 - IRSEM_Main Book

8.0 These measurements shall be recorded at different periods of the day - one in the
morning, one in the afternoon and one in the evening. These tests shall be extended for
three days.

9.0 Where stray current/voltages are observed, the length of the Direct Current track circuit
shall be cut down so as not to exceed the following limits for each length of Track
Circuit:

(a) The Rail-Earth voltage as measured across 9 ohms, 4 ohms, or 2.25 ohms shall not
exceed 0.1 V.

(b) The total stray current as measured shall not exceed 100 mA. Where all track circuits
to be installed on the line are less than 100 meters long, the highest acceptable
figure of stray current is 10 mA.

Chapter 17: Train Detection Track Circuits & Axle Counters Page 355 of 535