The BC 64 is identical to the 61 & 62,
but with some added features. This power cord has a control
box integrated into the power cord. Each control box has two
switches. The first switch is a two-position switch that allows
the user to lift the ground connection. This is very useful
in hunting down ground loop problems. The second switch is
a three-position switch that allows the user to reverse he line
polarity. Position one is normal (live-to-live, neutral-to-neutral).
The center position is open, to prevent arcing during transition.
The third position is reverse polarity (live-to-neutral, to neutral-to-live).
Not all homes are wired correctly, and some components are very
sensitive to line polarity. Many professionals have had very
positive feedback from professional installers about the usefulness
of these features.
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