Home » English riddles » Wiring and Cabling » Wiring Riddle No.5 – Manual changeover system » Reply To: Wiring Riddle No.5 – Manual changeover system Reply To: Wiring Riddle No.5 – Manual changeover system 2021-08-03 at 11:08 am #2421 Sinnadurai Sripadmanaban Thanks. How to do it with single set of contacts in each of three changeover switches was my question.