Step 1: Turn the main power switch on the switch board to OFF, then turn the safety switch ON (it should Stay on), then turn the Main Switch On.
If safety switch trips OFF proceed to step 2.
Step 2: Turn off all power points in your home. Then remove each appliance power lead from their power point.
Step 3: Turn safety switch ON. If safety switch stays ON there is a potential fault with an appliance. If safety switch trips OFF you need to proceed to step 4.
Step 4: Turn the main power switch on the switch board to OFF. Switch all circuit breakers OFF or REMOVE all fuses.
Note fuses need to be return to their original fuse holders. Turn the safety switch ON (it should stay on) then turn the main power switch ON.
(Safety switch should still be ON)
Step 5: One at a time, carefully INSERT each fuse into the correct fuse holder (the main power should be turned off prior to returning the fuse) or turn circuit breakers ON.
When the safety switch trips, you have identified the faulty circuit. REMOVE the last fuse or turn that particular circuit breaker OFF.
You can continue inserting the remaining fuses/turn circuit breakers ON.
You should have one fuse which is removed or one circuit breaker that is OFF.