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What is be the control and power cable size and length for a S811 RVSS ?

There no such recommendation for the power cable, it should be all as per NEC, the same applies to the disconnect switch also but there is a recommendation for the control wiring, here is the attached quick connect guide for S811, which will guide you through to the installation covering the wire size and length of the control wiring. 

  1. IT. S811 Quick Installation Guide IL03902001E.pdf