TM 5-811-7
(c) HSCBCI was chosen for this design purely as an example. It does not mean this material is better
than other anode types. Other acceptable anode materials include aluminum and platinized titanium or
niobium.
(d) For this design, silicon cells should be specified for the rectifier that protects the bowl, and
selenium cells should be specified for the rectifier that protects the riser. Silicon cells operate more efficiently
at high d.c. output voltages than selenium cells, but require elaborate surge and overload protection. This
protection is not economical in the low power consuming units. A guide for choosing rectifying cells is as
follows: use silicon cells for single-phase rectifiers operated above 72 volts d.c. or for three-phase rectifiers
operated above 90 volts d.c.; use newer, nonaging selenium for single-phase rectifiers operated below 72
volts d.c. or three-phase rectifiers operated below 90 volts d.c.
D-26
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