how to switch more 230v with arduino? i am working on a project automatic street lighting with arduino.i am done with the code and the circuit.i am able to switch the AC voltage in my house which is 230v,50hz with a 230v relay but when its comes to implementation there are 30 to 40 street lights are connected and the voltage is very high I think around 415 volts.what should I use to control that? need help
You have to use a relay that can handle minimum 415 volts (and keep some reserve).

Also take the current/amperage into account (possibly use multiple relays).