MIL-HDBK-1004/10
5.3.3 Induced Alternating Currents. As is the case for any large struct
in the vicinity of ac electrical transmission lines, ac can be induced on
underground or aboveground components of cathodic protection systems,
including the structure being protected. This is particularly true if th
structure is well coated or isolated from the ground and is oriented
parallel to the transmission lines. Pipelines using the same right of wa
as the transmission lines are particularly susceptible to induced ac
voltages. In addition to causing corrosion damage, these voltages can be
dangerous to personnel who may come in contact with the structure or
cathodic protection system. The location of the ac transmission lines
should be noted during the design of cathodic protection systems. The
effects of induced currents and relocation of either the transmission lin
or the planned system should also be considered. Location of test statio
in areas where induced currents may exist should be particularly avoided.
Induced currents should also be considered when performing cathodic
protection field surveys or other electrical tests in the vicinity of ac
transmission lines.
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