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Stacking Variacs, paralleling



Original poster: "Randy & Lori" <rburney6-at-comcast-dot-net> 

I have three 240V/28amps (ea.) variacs on the way (225Lbs ouch!).  They do 
not have the paralleling chocks.  Can I make my own?  Are these really 
necessary to connect the variacs in parallel?  I have seen on commercial 
units that they are actually just transformers, I've got enough MOT cores 
to make transformers, but what am I after?

Randy