Nace CP 1, Course Manual

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Installing C.P. Components 8:21
CP 1 – Cathodic Protection Tester Course Manual
©
NACE International, 2000
07/01/04
Figure 8.18 Prepackaged Impressed Current Anode
The conductor (negative lead wire) to the structure should be correctly
connected. Conductor connections to the rectifier must be mechanically
secure and electrically conductive. Before the power source is energized, it
must be verified that the negative conductor is connected to the structure to
be protected and the positive conductor is connected to the anodes. After
the direct current power source is energized, appropriate measurements
should be made to verify that the connections are correct.
Underground splices on the header cable (positive lead wire) to the
groundbed should be kept to a minimum. Connections between header
cable and conductors from anodes should be mechanically secure and
electrically conductive. If buried or submerged, these connections must be
sealed to prevent moisture penetration such that electrical isolation from the
environment is ensured.
Care must be taken when installing direct burial cable to the anodes
(positive lead wire) to avoid damaging insulation. Sufficient slack should
be left to prevent strain on all wires. Backfill material around the cable
should be free of rocks and foreign matter that might damage the wire
insulation when wire is installed in the trench. Cable can also be installed
by plowing if proper precautions are taken.
If insulation integrity on the buried or submerged header cable (positive
lead wire), including splices, is not maintained, the cable will fail from
electrolytic corrosion.
END CAP
ANO DE
CO KE BACKF
M ETAL
CO NTAINER
END C AP
LEAD W IRE