ETL 1110-9-10(FR)

5 Jan 91

A is the total surface area. If the structure surface is

g.

Calculate required rectifier voltage and current.

The required rectifier voltage (VREC and maximum current

rating should include at least an extra 20 percent to allow

for variations in calculations from actual conditions and

for changes in the system over the system's life.

VREC = (I) (RT) (1.2)

(eq 1-17)

where I is the total current required and RT is the total

circuit resistance as calculated above.

IREC = (I) (1.2)

(eq 1-18)

where I is the total current required and IREC is the

minimum current rating for a rectifier for this particular

application.

Select a rectifier with DC voltage and current capacity of

a slightly larger size (as calculated above) from the

cathodic protection rectifier manufacturer's published

literature.

h.

Prepare life cycle cost analysis.

The life cycle cost analysis should be prepared according

to the guidelines given in TM 5-802-1 (reference 9).

Another source of information on performing life cycle cost

analyses is NACE RP-02-72 (reference 21). The choice of a

particular anode type and configuration for design

calculation is somewhat arbitrary.

The economics may

dictate switching to a different design configuration and

repeating the applicable design steps.

i.

Prepare plans and specifications.

Prepare plans that show the protected structure, locations

of anodes, rectifier, test stations, and power source, wire

routing, and details of wire-to-structure connections,

building or structure penetrations, wire color coding,

potential survey test points in paved areas, and other

pertinent information. Prepare a one-line diagram to show

the entire system including wire sizes, anode type(s),

power circuit, power circuit protection, and source of

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