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What is the difference between the Trace SWI and SWI/PAR?

Trace SW Stacking Cables Differences 

Here is the pin out  for the Series Stacking Cable 
This is used for 120/240V output

Here is the pin out for the Parallel Stacking Cable.
This is used in conjunction with SWI/PAR parallel stacking transformer (120V at 2 times current rating)

IMPORTANT : SWI/PAR requires external parallel stacking transformer (see attached)

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