Variac

[Gordon C. LaGrange]

Hello to all,
Haven't turned on my old Heath station for 5 years.  I'm in the process of
building a variable AC power supply with isolation transformer to bring it
up slowly.  I have acquired a GE Volt-Pac (variable transformer), Model
9T92A1, but I'm concerned about the insulator between the winding and the
grounded steel "panel" at the front of the winding. The "panel" is attached
to the control shaft mounting bushing.  The insulator may be fiberglass,
but its very thin, and apparently a single layer.  Any comments?

Also, I can think of several reasons pro and con for placing the isolation
transformer ahead of, or after, the variac.   Anyone know how this is
usually done in commercial units?

TIA for all comments, Gordon

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