Nace CP 1, Course Manual

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Installing C.P. Components 8:24
CP 1 – Cathodic Protection Tester Course Manual
©
NACE International, 2000
07/01/04
Pigtail Wire
Furnished with
Anode
Anode
Anode Backfill
Earth
Backfill
Header Cable to Other
Anodes and Power Source
Insulated Connection
Figure 8.20 Horizontal Impressed Current Anode
Header Cable Installation
The header cable trench is usually dug by a backhoe or trencher to the
specified depth in accordance with local code. Lay the header cable in the
trench, again being very careful not to damage the cable insulation. Leave
slack in all wiring. When long lengths of header cable are required such as,
for example, in a surface distributed anode installation, the cable may be
plowed in. When plowing in cable, be very careful not to damage the
insulation.
Splice each anode lead wire to the header cable and carefully insulate the
splice. The splice is the most critical part of the installation and must be
done properly. Complete the installation
by backfilling the header cable
trench.
The cable should be laid on about three inches of sand or select backfill,
and after all splicing is done, covered with about the same amount. Avoid
getting any stones, debris, or other objects that might damage the cable into
the backfill. Native soil is usually used to finish backfilling the trench.
If there is a concern over damage to the cable from future excavations, lay a
plastic warning tape and perhaps a wooden plank about a foot over the
cable. This precaution is especially important with surface distributed
anode systems where there may be an extensive amount of cable in the
ground.