Handbook of Electrical Installation Practice - BeKnowledge

RECENT DEVELOPMENTS
Cathodic protection is also applied to metallic structures which are intermittently
in contact with an electrolyte of corrosive or potentially corrosive nature. This
includes above-ground metallic structures subject to wetting by either natural electrolytes
(e.g. rain or salt water) or artificial electrolytes from process manufacturing.
Impressed current anodes are attached to the structure via insulated pads, and
current is applied when the electrical resistance between the anode and cathode
allows these currents to flow. This form of cathodic protection is not subject to the
testing and monitoring procedures previously mentioned but is visually inspected
on a frequent and regular basis. Recent evidence gathered from long term testing
of such structures indicates that the method is effective for continued operating
integrity.
It is expected that cathodic protection will continue to find new applications
with the development of new materials and methods to ensure technical and
fiscal viability. In all cases, however, installation of cathodic protection equipment
remains an electrical discipline and subject to electrical installation practice and
procedures.
CONCLUSIONS
Cathodic protection is a specialist technology used for corrosion control, but the
installation of cathodic protection equipment conforms to the appropriate engineering
standards. Specialist advice should be sought, however, where no clear or
adequate specification exists.
FURTHER INFORMATION
Further information with respect to cathodic protection is available from the following
organisations:
Institute of Corrosion
Corrosion House
Vimy Court
Vimy Road
Leighton Buzzard
LU7 1FG
National Association of Corrosion Engineers
PO Box 218340
Houston
Texas
TX 77218–8340
Cathodic Protection 195