The lights are out. The neighbours have power. You have flicked the main back on three times and it keeps tripping. This is what happens next when you call.
The lights are out. The neighbours have power. You have flicked the main back on three times and it keeps tripping. This is what happens next when you call.
A no-power callout sounds simple. The power is off, the electrician arrives, the power comes back on. In practice, the diagnostic work behind that result is what separates a clean fix from a recurring fault.
This guide walks through what happens on a typical Sydney no-power callout, the most common causes we find, why repeatedly resetting a tripped main is a bad idea, and what you can do safely before we arrive.
When you call, we ask three questions before dispatching. Each one changes the urgency and the kit we bring on the truck.
If the street is out, it is a network outage and Ausgrid is already on it. There is nothing an electrician can do at the property. If only your house is out, the fault is inside your boundary, and that is when we need to be there.
Was there a storm? Was something plugged in? Did the safety switch trip while the oven and air-con were running? The trigger usually points straight to the cause, and it helps us narrow the search before we arrive.
If you smell burning, see smoke, or hear arcing from the switchboard, evacuate and call 000 first. Then call us. If the home is dark but otherwise normal, you are fine to wait. Do not keep resetting the main repeatedly. It makes the fault worse and the diagnosis harder.
When we arrive, the first job is to isolate the supply at the main and confirm where the fault sits. Modern Sydney switchboards have RCBOs on each circuit, so the trip tells us which circuit failed. From there it is a process of elimination.
We disconnect every circuit, test the insulation resistance to ground, and reconnect one at a time. The one that trips the protection again is the source. From there we trace the cable run, check every accessible junction, and find the actual fault point. On a typical residential call, the process takes thirty to ninety minutes start to finish.
Across hundreds of callouts a year, the same handful of causes account for the vast majority of no-power emergencies. Knowing the patterns helps us arrive prepared.
Kettles, toasters, irons, hair dryers, and old air-conditioners are the usual suspects. The appliance develops a short, the safety switch trips, and the rest of the circuit is dragged down with it. Unplug everything on the dead circuit before we arrive. If the main resets cleanly, the appliance was the cause.
Wind-driven rain pushes water past the lip of an outdoor powerpoint, soaks the back of the outlet, and trips the protection. Once the water dries out, the trip clears. Outdoor outlets without IP-rated covers see this every storm season.
RCDs themselves wear out. After ten to fifteen years, the internal mechanism stops resetting cleanly. The fault we find is the switch itself, not the circuit behind it. Replacement is usually under an hour.
In older homes with ceramic fuses or 1990s switchboards, the board itself can fail. A neutral bar carbonises, a connection burns through, or the main switch contacts pit and lose continuity. These are usually the boards that needed an upgrade a decade ago.
Every time you reset a tripped main into a live fault, the inrush current arcs across the contacts. That arc deposits carbon, pits the metal, and shortens the life of every protection device on the board. After three or four resets into the same fault, you may need to replace components that would have been fine if the main had stayed off.
If your main trips and the cause is not obvious, isolate it, leave it off, and call us. We can sort it. Forcing it open in the meantime usually adds cost rather than saves time.
Identify which area of the house is dark. Unplug every appliance on that area, including the obvious ones like kettles, toasters, and chargers, and the less obvious ones like the pool pump or the bar fridge in the garage. Once everything is unplugged, do not reset the main. Wait for us.
If you have a torch, find your switchboard before we arrive and clear access to it. If the meter is behind a locked gate, leave it open. Small things like this turn a forty-five minute call into a twenty-five minute call, and reduce the bill accordingly.
If your safety switch is more than ten years old, or it trips for no obvious reason, it is already telling you something.
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