Half My Power Is Out: What's Going On and What Should I Do?

It's one of the more confusing electrical problems. Some lights work, some don't. Half your power points are dead. The hot water's out but the stove still works. Something's clearly wrong, but your switchboard looks fine. Here's what's actually happening, what to check yourself, and when you need to call an electrician in Warrnambool.

Why Does "Half" the Power Go Out?

To understand this, you need to know a bit about how power is delivered to your home. The electricity network supplies your property with a single-phase 230V supply (for most residential properties). But that supply comes from a three-phase distribution system on the street, and each house in your street is connected to one of the three phases.

Inside your switchboard, your circuits are spread across what are called "busbars", essentially the internal distribution rails that all your breakers connect to. In a standard Australian home, all circuits share the same single-phase supply, so if the supply drops, everything goes out.

Properties with a multi-phase supply can lose one phase while other circuits still have power. Do not assume partial power means the remaining supply is safe.

More commonly though, what people experience as "half power out" is actually:

• A single breaker or RCD that's tripped, cutting off a group of circuits
• A fault on the neutral conductor (this is serious and needs immediate attention)
• A fault in the meter box or service fuse
• A problem on the distribution network affecting your phase but not your neighbours (if they're on a different phase)

Common Causes of Partial Power Outages

Tripped Breaker or RCD

This is the most common cause. A circuit breaker or RCD has tripped, cutting power to everything on that circuit or group of circuits. It might be from an overload, a fault in an appliance, or a developing wiring fault. This is something you can check yourself at the switchboard.

Blown Service Fuse or Meter Box Fault

Supply equipment or a service fuse can be involved in an outage. Do not open or interfere with metering, sealed equipment or service fuses; report a suspected supply fault to Powercor.

Powercor’s fault line is 13 24 12. The correct repair and ownership boundary needs to be checked for the actual connection.

Neutral Fault - This One Is Serious

If there's a break or fault in the neutral conductor, either the main neutral coming into your property or the neutral on a circuit, you can get very unusual behaviour. Lights might dim unexpectedly, appliances might run at wrong voltages, some things work and others don't. This can cause voltage imbalances that damage appliances and can be dangerous.

Partial supply, dull or flickering lights: keep away from the switchboard and metal fittings and call your electricity distributor immediately. For Powercor, call 13 24 12. Do not try to diagnose or repair a suspected neutral fault yourself.

Street Supply Issue

Sometimes the fault isn't in your property at all. Faults on the distribution network, such as a blown fuse on the street transformer, storm damage, or a vehicle hitting a power pole, can affect some properties but not others, depending on which phase they're connected to.

If your neighbours are also affected or you can see a downed line, it's a network issue. Call Powercor on 13 24 12.

What to Check First

Before calling anyone, run through this checklist:

1. Do not approach the switchboard for partial supply or dull or flickering lights. Contact the distributor immediately. For other outages, follow its advice; do not remove covers or repeatedly reset a switch.
2. Check the Powercor outage map - go to powercor.com.au/outages and enter your address. If there's a known outage in Warrnambool, it'll show up there. If there is, you just need to wait for them to fix it.
3. Note whether neighbours are affected: this is useful information, but their lights being on does not rule out a supply fault at your property.
4. Note what's working and what isn't - is it specific rooms? Specific circuits (lights vs power points)? Hot water? Air conditioning? This information helps me diagnose the issue faster when I get there.
5. Check for burning smell or unusual sounds - if you can smell burning from the switchboard or hear crackling, don't touch anything. Get out and call an electrician urgently.

When Is It Your Problem vs the Network's?

Here's a simple way to think about it:

• Suspected network or supply fault: report it to Powercor on 13 24 12.
• Faults in the property’s electrical installation: a licensed electrician can inspect and repair these once the supply is safe.
• Connection and metering equipment: responsibilities vary; the distributor, retailer or metering provider and electrician may need to coordinate. Do not assume every cable or meter belongs to Powercor.

If the distributor confirms the supply is safe and the fault is within the property, Luke can investigate the installation.

The Fault Finding Process

When I attend a partial power outage in Warrnambool, here's what the fault finding process looks like:

1. Confirm the supply - I'll check the voltage coming into your switchboard to confirm what the network is delivering
2. Check the switchboard - inspect breakers, RCDs, the main switch, and the neutral bar for any obvious faults, burning, or loose connections
3. Isolate and test circuits - systematically test affected circuits to identify where the fault lies
4. Trace the fault - this might involve testing at outlets, light fittings, and in roof or sub-floor spaces depending on where the circuit fault is located
5. Repair and test - fix the fault and verify everything's operating correctly before I leave

Electrical fault finding isn't always quick. Some faults are straightforward, others take time to trace. But I'll keep you informed throughout and won't drag the job out unnecessarily.

Why Prompt Action Matters

Partial power outages often indicate a developing fault, something that's getting worse, not better. Leaving a fault unaddressed can lead to:

• Further damage to wiring or appliances
• Increased risk of electrical fire
• Complete power loss at the worst possible time
• More expensive repairs if the fault progresses

If you're in Warrnambool and you've lost power to part of your home, give me a call on (03) 4708 4168. I can often help diagnose over the phone before coming out, and I'll get to you as quickly as I can.