To johansen
See the wiring diagram below. My powerstat uses the outer inputs and outputs for 240V operation. Wires Red, Black, and Ground. There is no common.
To gaijin
I did see this in the specs for the larger units 20A and above but there doesn't seen to be any mention of the T5587 choke for the 10A model. Frankly I can't find much info on the T5587 choke at all. I found this on the Jenkins website
*Paralleling Chokes are required at additional cost on these units but are included on 1156, 1256 and 1296 multigang units.
Paralleling Chokes, Brushes and Fuses are shown on Page 32."
I'll be damned if I can find page 32!
If anyone can give my info on this choke and maybe theory of operation as it relates to phase matching two variacs it would be greatly appreciated.
Thanks for the replies,
John