Nace CP 1 - Page 190

Stray Current Interference 6:7
CP 1 – Cathodic Protection Tester Course Manual
© NACE International, 2000
02/01/05
DC
Substation
+
_
Tracks Negative
Return
Overhead
Positive Feeder
Load Current
Required to
Operate Train
Bond
Cable
Bond across High
Resistance Joints
Figure 6.3 Mitigation Bond Used to Control Stray Current from a Rail
Transit System
Cathodic
Protection
Current
Protective Current
Protected Line
Foreign or Affected
Line
Protective Current
Picked Up by
Foreign Line
MITIGATION
BOND
Interference (Corrosive)
Current Flowing Through
the Earth to Return to
Protected Line
p
Figure 6.4 Mitigation Bond Used to Solve a Cathodic Interference
Problem