Written by H. Irwin Electrical | Published on July 2025
Winter in Adelaide may be mild compared to other parts of Australia, but cold evenings still push households to run heaters, electric blankets, and other appliances at full capacity for weeks at a time. This seasonal surge in electrical demand is one of the leading causes of home electrical faults and fires across South Australia.
In this guide, H. Irwin Electrical covers the most important winter electrical safety tips for homes in Adelaide and surrounding suburbs including Glenelg, Marion, Unley, North Adelaide, and Henley Beach. Whether your home is a 1960s Plympton brick veneer or a newer build in Somerton Park, these tips apply to you.
Understand Why Winter Increases Electrical Risk
Cold weather changes how Australians use electricity at home. Heaters, heated towel rails, electric blankets, and slow cookers all run longer and harder through June, July, and August. This puts extra load on your home’s wiring and switchboard.
Older homes in suburbs like Hyde Park, Kurralta Park, and Glandore often have wiring that was installed decades ago. That wiring was not designed to handle the load of modern appliances running simultaneously.
Common winter electrical risks include:
- Overloaded power boards and double adaptors
- Faulty or ageing portable heaters
- Electric blankets with damaged cords or internal faults
- Switchboards without safety switches (RCDs)
- Moisture from rain and condensation affecting outdoor and sub-floor wiring
- Dryers running frequently in closed spaces without proper ventilation
Knowing the risks is the first step. Acting on them before winter peaks is how you protect your home and family.
Check Your Switchboard Before the Cold Sets In
Your switchboard is the heart of your home’s electrical system. If it is outdated or missing safety switches, your home is at greater risk during winter when demand is highest.
In South Australia, safety switches (also called RCDs or residual current devices) are required on power circuits and lighting circuits in new builds and renovations. However, many older homes across Richmond, Beverley, Prospect, and Fulham still have fuse-based boards with no RCD protection at all.
A safety switch detects fault current and cuts power within 30 milliseconds, fast enough to prevent a fatal electric shock. Without one, a single fault in a heater cord or appliance can be deadly.
Here is what to look for when checking your switchboard:
- Are there any signs of scorch marks, burning smell, or discolouration?
- Do you have safety switch buttons (test buttons) on your switchboard?
- Are any breakers or fuses tripping repeatedly?
- Is your board ceramic fuse-based rather than circuit breaker-based?
- Has your board ever been inspected by a licensed electrician?
If you answered yes to any concern above, call H. Irwin Electrical on 0432 270 757 to book a switchboard inspection before winter peaks.
Use Heaters Safely and Avoid Overloading Circuits
Portable electric heaters are one of the most common causes of household fires in winter. Most portable heaters draw between 1500 and 2400 watts. Running two on the same circuit, alongside other appliances, can easily exceed the circuit’s rated capacity.
The table below shows typical wattage for common winter appliances and the risk of overloading a standard 10-amp circuit.
| Appliance | Typical Wattage | Risk on a 10A Circuit |
|---|---|---|
| Portable panel heater | 1500W – 2400W | High if combined with other loads |
| Electric blanket | 60W – 120W | Low on its own |
| Clothes dryer | 2000W – 2800W | Very high, should run on its own circuit |
| Slow cooker | 150W – 300W | Low to moderate |
| Television + streaming box | 80W – 200W | Low on its own |
A standard 10-amp household circuit is rated at approximately 2400 watts. Plug a 2000W heater and a 2400W dryer into the same circuit and you have a problem.
Follow these safe heater habits every winter:
- Plug heaters directly into wall sockets, never into power boards or extension leads
- Keep heaters at least one metre away from curtains, bedding, and furniture
- Turn heaters off when leaving the room or going to sleep
- Do not use bathroom or outdoor heaters inside living areas
- Have portable heaters with damaged cords replaced immediately
Inspect Electric Blankets Before First Use Each Year
Electric blankets are a wintertime staple in many Adelaide homes, especially for older residents in areas like Unley and North Adelaide. But an electric blanket that is folded incorrectly, stored under a mattress, or more than 10 years old can be a serious fire hazard.
The internal wiring of an electric blanket degrades with age and use. A frayed wire inside the blanket creates a hotspot that can ignite the fabric while you sleep.
Before you use your electric blanket this winter, run through this checklist:
- Check the cord for any cracking, fraying, or exposed wires
- Look for scorch marks, discolouration, or unusual smells when first switched on
- Confirm the blanket lies flat and is not bunched up or folded under the mattress
- Check the age of the blanket. Replace anything older than 10 years
- Never use an electric blanket and a hot water bottle on the same bed at the same time
If you are unsure whether your electric blanket is safe, the safest move is to replace it. A new blanket from a reputable brand costs between $40 and $150, which is far less than the cost of an insurance claim or a hospital visit.
Compare Electrical Safety Features Homes Should Have in Winter
Not all South Australian homes have the same level of electrical protection. The table below compares the key safety features that modern and older homes typically have, and what an upgrade involves.
| Safety Feature | Older Homes (Pre-2000) | Modern Homes | Upgrade Cost (Approx.) |
|---|---|---|---|
| Safety switches (RCDs) | Often absent | Required on power and lighting | $150 – $300 per RCD installed |
| Switchboard type | Ceramic fuse | Circuit breaker with RCDs | $800 – $2,500 for full upgrade |
| Smoke alarms | May be absent or battery-only | Hardwired and interconnected | $80 – $200 per alarm installed |
| Outdoor circuit protection | Often unprotected | GFCI-protected outdoor sockets | $100 – $250 per circuit |
| Wiring type | Rubber or cloth-sheathed | PVC-insulated TPS cable | Varies by scope |
Homes in suburbs like West Beach and Henley Beach also need attention to outdoor circuits after winter storms. Salt air and rain can accelerate corrosion in outdoor power points and meter boxes.
H. Irwin Electrical services all of these areas and can assess what your home needs before winter causes a real problem.
Know What to Do if Your Power Trips or You Smell Burning
A tripped circuit breaker or safety switch is your system working as intended. But if it keeps tripping, that is a warning sign, not just an inconvenience. Repeated tripping means the circuit is being overloaded or there is a fault in an appliance or the wiring.
A burning smell from a power point, switchboard, or appliance is a serious warning that should never be ignored. Switch off the circuit at the board, unplug the appliance, and call a licensed electrician.
Here is how to respond to common winter electrical problems:
- Tripped safety switch: Unplug appliances on that circuit, then reset the switch. If it trips again, call an electrician.
- Burning smell from a power point: Do not use it. Switch off at the board and call for inspection.
- Flickering lights: Can indicate loose connections or an overloaded circuit. Have it checked.
- Sparking when plugging in: Occasional small sparks can be normal, but frequent sparking means the outlet needs replacing.
- Power out to one part of the house: Check the switchboard first. If breakers look fine, call an electrician.
Never attempt to do your own electrical repairs. In South Australia, only a licensed electrician can legally carry out electrical work. Unlicensed electrical work is a safety risk and may void your home insurance.
FAQs on Winter Electrical Safety for South Australian Homes
How often should I test my safety switches at home?
Safety switches should be tested every three months using the test button on your switchboard. Press the button and the switch should trip immediately. If it does not trip, the safety switch is faulty and needs replacing by a licensed electrician.
Can I use a power board to run my electric heater in winter?
No. Portable heaters should always be plugged directly into a wall socket. Power boards are not rated to handle the sustained current draw of a heater and can overheat, causing a fire risk. This is one of the most common winter electrical mistakes in Australian homes.
Is my home required to have smoke alarms in South Australia?
Yes. South Australian law requires smoke alarms in all residential properties. Since 2022, new requirements mean that when a home is sold or a tenancy begins, smoke alarms must comply with updated standards. A licensed electrician can confirm your home meets current requirements.
What is the risk of leaving a portable heater on overnight?
Leaving a portable heater on overnight significantly increases fire risk, especially if placed near soft furnishings. Most heater-related fires occur between 10pm and 6am. It is strongly recommended to turn off portable heaters before sleeping and use a programmable ducted or reverse-cycle system for overnight warmth instead.
Why does my power keep tripping in winter?
Repeated tripping in winter usually means you are running more appliances than the circuit can handle, or there is a fault in one of those appliances. Try unplugging devices one at a time to identify the culprit. If the problem continues after reducing load, there may be a wiring fault and you should call an electrician.
How do I know if my home’s wiring is old enough to be a safety risk?
Homes built before the mid-1980s may have rubber or cloth-sheathed wiring that has degraded over time. Signs include discoloured power points, burning smells, or frequent tripping. An electrician can inspect your wiring and advise on whether rewiring or targeted repairs are needed.
Wrap Up and Next Steps
Winter electrical safety comes down to preparation. Check your switchboard, test your safety switches, inspect your heaters and electric blankets, and avoid overloading circuits during the cold months. Small actions taken now prevent serious problems later in the season.
H. Irwin Electrical is based in Glenelg and services homes across Adelaide including Marion, Plympton, Unley, Prospect, Henley Beach, and beyond. If your home needs a safety inspection, switchboard upgrade, or any electrical repair this winter, call us on 0432 270 757 to book a time that suits you.
