Caravan mains power wiring is a little different from other installations, classified as a “transportable” means it comes under its own AS/NZS Standard 3001:2008. This includes RVs, Campers and Tiny Houses if they are on a trailer, if they are to have mains wiring installed. Some of the usual requirements are as follows:

  • It is recommended that the inlet (male plug on the outside of the caravan) should be wired directly to an RCD (Type RCBO, 16 amp) replacing a main switch
  • All mains wiring must be separate and isolated from the 12 volt DC wiring
  • The wiring must be 7-stranded
  • Wiring must be protected where it passes through the chassis
  • Wiring must be separated from any polystyrene insulation
  • The chassis must be earthed (use 6mm green conduit wire to the switchboard)
  • The maximum resistance from the earth pin of the supply lead plug to any part of the chassis = 0.5 ohms

There are also requirements regarding how the transportable is plugged into the supply via its supply lead:

  • Minimum supply lead length for caravan parks is 10 metres (no minimum elsewhere)
  • As a guide supply lead maximum length (1.5mm flexible cable) should be 25 metres
  • The socket outlet supplying the transportable must be individually RCD and overload protected and must have an isolating switch adjacent to the socket.