UFC 3-570-06
JANUARY 31 2003
Figure 7-24. Testing for a Short Between Two Structures with Power Supply
R ef eren ce
E lect ro de
T est P oint
V oltm eter
T est P oint
1
+
-
2
S tru ctu re 1
S tru ctu re 2
W it h ou t C P
W it h ou t C P
T em po ra ry
-+
P o wer
Su pply
T em po ra ry
A no des
7-10
CURRENT REQUIREMENT TESTING PROCEDURES. Current
requirement testing is conducted when planning a cathodic protection system
installation to determine the type and size of the system required. If the system design
requires isolation of the structure to be protected, that isolation must be accomplished
prior to the current requirement test. The current requirement for a non-isolated
structure does not give any indication of what the current requirement would be if the
structure were isolated. Temporary systems are used to determine the effect of current
applied on the potential of the structure being tested. Actual protection need not be
accomplished to estimate the amount of current required. Portable rectifiers should be
used together with temporary anodes (usually ground rods) or existing metallic
structures to impress a test current to the structure. Vehicle batteries can be used, as
well as spare rectifiers, DC generators, DC welding units, or rectifiers from other
systems can be temporarily removed for use.
7-10.1
Temporary Local Cathodic Protection Systems. Temporary local cathodic
protection systems should be located in areas where the intended installation is to be
located, if known. If not known, they should be located as remote as possible from the
structure to be protected, without any foreign structures in the area of the temporary
anode bed, and without any foreign structure between the temporary anode bed and the
7-38
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