How do I scan A3 size documents?

How to scan A3 size documents varies depending on the scanner model.

• iX2500/iX2400/iX1600/iX1500/iX1400/iX1300/iX500/iX100/S1100i/S1100
  [HELP]
• SV600
  You can scan A3 size documents or smaller without changing any settings.