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ETL 1110-9-10(FR)
5 Jan 91
Thus, the copper cored anode longitudinal
resistance
is less than
10 percent of the
anode-to-water resistance (0.048 ohm/1.13 ohm -
0.043 = 4.3 percent) making this an acceptable
riser anode design.
c)
Tank-to-water
and
negative
circuit resistance = 0.0 ohm.
d)
Calculate total resistance of the riser circuit
(RT):
RT = 1.13 + 0.15 + 0.0
RT = 1.28 ohms for riser anode.
17) Calculate the rectifier voltage (VREC) and current:
a)
First, determine the voltage requirement (E) for
each circuit using Ohm's Law:
E = I RT
Where:
I=
Current requirement.
RT =
Total circuit resistance.
Main Anodes:
I = 17.7 amp (from step 11c).
RT = 1.46 ohms (from step 13b).
E = 17.7
x 1.46 = 25.8 V
Stub Anodes:
I=
1.3 amp (from step 11c).
RT =
21.16 ohms (from step 13c).
E = 1.3 x 21.16 = 27.5 V
Riser Anodes:
I=
14.5 amp (from step 4)
RT =
1.28 ohms (from step 16d)
E = 14.5 x 1.28 = 18.6 V
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