If half your house has lost power while the rest still works, the most likely cause is a failed service fuse (also called a barge fuse) on your main supply, not a tripped switch inside your home. A service fuse sits on the network side of your connection, and when one of them blows, everything on that part of your supply goes dead while the other part keeps running. Replacing it is Level 2 work, so it needs a Level 2 Accredited Service Provider (ASP), not a standard electrician and not a wait in the Ausgrid queue.
Here is how to recognise it and what to do right now.
The tell-tale signs
A blown service fuse has a very particular fingerprint. You will often notice:
- Some rooms dead, others fine. Power points and lights work in part of the house but not another part.
- Half an appliance working. An oven where the light comes on but the elements do not heat, or a cooktop where only some burners work.
- Lights dimming when a big appliance runs. A sign one phase is struggling before it drops out completely.
- Nothing tripped on the switchboard. You check the board and none of the safety switches or breakers are in the off position.
That last point is the giveaway. If nothing on your board has tripped but part of the house is dead, the fault is usually upstream of the board, on the service fuse.
What a service fuse is and why it fails
A service fuse, sometimes called a barge fuse, is a protective fuse on the supply feeding your property. It is designed to fail safely if there is a fault or overload on that line, cutting power to protect the wiring. They can blow because of age, corrosion, storm damage to the network, water getting into the connection, or a heavy load fault. Because the fuse sits on the network side of the meter, it is sealed and only a Level 2 ASP is authorised to replace it.
Half your power out? We are Level 2 and available 24/7.
DM Electrical is a Level 2 ASP based in Brookvale. We are authorised to replace failed service and barge fuses, day or night, across the Northern Beaches, North Shore, and wider Sydney. Do not sit in the dark waiting on the network queue. Call us and we will get your power back.
Why only a Level 2 electrician can replace it
The service fuse lives on the sealed, network side of your connection. A standard licensed electrician is not permitted to break that seal or work on the supply, and Ausgrid's own crews can be hours away during a storm event. A private Level 2 ASP is accredited to do exactly this work, which is why a Level 2 emergency electrician is the fastest safe way to restore power. If you are unclear on the tiers, see the difference between a Level 1, Level 2 and standard electrician.
What to do right now
- Check your switchboard first. If a safety switch or breaker has tripped, try resetting it once. If it holds, that was the issue. If nothing is tripped, move to the next step.
- Do not touch the meter or service fuse. It is live, sealed, and dangerous. This is not a DIY fix.
- Unplug sensitive electronics on the dead section in case of a surge when power returns.
- Call a Level 2 emergency electrician. Describe the symptom (half the house out, nothing tripped) so they arrive ready for a service fuse job.
Storm season makes this common
Sydney's summer storms are a frequent trigger. Wind and water hitting the network, a nearby lightning strike, or a branch on the service line can all take out a service fuse. During big weather events the network is flooded with calls, so a private Level 2 ASP is often the quicker route back to power. It is also worth knowing the difference between this and a breaker that keeps tripping, which is a separate problem on the board itself.
Frequently asked questions
Why is half my house without power?
The most common cause of half a house losing power while the rest works is a failed service fuse (barge fuse) on your main supply. It sits on the network side of your connection, so when one blows, everything on that part of the supply goes dead while the other part keeps running. Replacing it is Level 2 ASP work.
What is a service fuse or barge fuse?
A service fuse, sometimes called a barge fuse, is a protective fuse on the supply feeding your property. It fails safely to protect the wiring if there is a fault or overload. Because it is on the sealed network side of the meter, only a Level 2 Accredited Service Provider can replace it.
Can a normal electrician replace a service fuse?
No. The service fuse is on the sealed, network side of the connection. A standard licensed electrician is not permitted to work on it. Only a Level 2 ASP is accredited to replace a service or barge fuse, which is why a Level 2 emergency electrician is the fastest safe way to restore power.
What should I do if half my house loses power?
First check your switchboard and reset any tripped safety switch once. If nothing is tripped, do not touch the meter or service fuse, unplug sensitive electronics on the dead section, and call a Level 2 emergency electrician. Describe the symptom so they arrive ready for a service fuse replacement.
The bottom line
Half the house dead with nothing tripped on the board almost always means a failed service or barge fuse on your supply. It is not a DIY job and not one a standard electrician can legally touch. A Level 2 ASP can replace it safely and get your power back, often faster than the network queue. DM Electrical does this 24/7 across Sydney and the Northern Beaches. Call 0410 144 047.