Hi,
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All returns for 1 (!!) YD8008 may be connected in Common. ( as they are internally )
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Reason for this is, that the "Commons" are supplied by the internal CDU. Connecting the "Commons" of multiple YD8008's will definitively destroy one or more of them.
I have over 30 turnouts to control so I would be using 3 x YD8008.
Then you would need 4. Since each 8008 handles 8 Turnouts. ( 3x8 = 24 )
Greets,
Karst
karst.drenth