(a) (b) Figure 2. (a) The equipment for nonballasted system testing and (b) a closer look at the equipment. RlR = ^U A ON - U A OFF h + ^U B ON - U B OFF h I . (6) Testing the Conductance per Length for Track Sections Without Civil Structures The track section to be examined is separated from the continuing lines by insulated rail joints or rail cuts. The length of the track section should not exceed 2 km. In case the length of the track section does exceed 2 km, the IEC 62128-2 standard shows a more complex method; insulated rail joints could also be provided in advance. The conductance per length of the running rails versus the earth (GlRE) of the separated track section is determined in accordance with the method shown in Figure 5 and 1 I GlRE = $ a U ON - U OFF k . l RE RE Figure 3. The interconnected metallic parts. (7) Again, it is advised that the value of the current I supplied by the source be between 15 and 30 A. The voltage values U RE ON and U RE OFF taken between the rails and a reference electrode must be measured with the source turned ON and OFF in a cycle, as explained earlier. Testing the Conductance per Length for Track Sections with Civil Structures A special measuring arrangement and measuring sequence allows the measurement of the conductance per the length of running rails against metal reinforced structures without the need of additional insulating rail lS lB lS US lB UB - + I Figure 4. A measurement of continuity. IEEE Elec trific ation Magazine / S EP T EM BE R 2 0 1 6 27