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Matt Farrell Electrical – Electrician Bundaberg
Are Extension Cords Quietly Damaging Your Home’s Electrical System?
Most houses I walk into around Newcastle and Lake Macquarie have the same problem hiding in plain sight. It’s the extension cord that’s been running under the lounge room rug since 2022. Or the one powering the beer fridge out in the garage. Or the tangled mess behind the home office desk that you stopped noticing about six months ago.
I get why it happens. Adding a new power point means calling a sparky, booking a time, spending a bit of money. Grabbing an extension cord from Bunnings costs twenty bucks and solves the problem in thirty seconds. Easy choice, right?
The issue is that the easy choice slowly creates a bigger, more expensive problem you can’t see.
What Extension Cords Actually Do to Your Wiring
Your house wiring is fixed. The copper inside the walls is a certain thickness, and the circuit breaker in your switchboard is sized to protect that exact amount of copper.
When you plug a long extension cord into the wall, you’re adding more copper to the circuit. That sounds harmless. But the cord itself has resistance. The longer and skinnier the cord, the harder it is for electricity to push through.
This creates something called voltage drop.
Let’s say your fridge needs 240 volts to run its compressor properly. At the end of a cheap 10-metre cord, it might only be getting 220. The fridge doesn’t just stop working. It tries to pull more current to make up the difference. The motor runs hotter. The windings inside the compressor degrade faster. You don’t notice until three years later when the fridge dies and you assume it was just old age. Half the time, the extension cord did the damage.
The other problem happens at the wall socket itself. Extension cords are heavy, especially the thick ones.
The plug is drawn downwards by gravity. In weeks and months, such steady downward pull wears the brass contacts in the power point loose. A loose connection produces small electrical sparks. Arcs generate heat.
A little too much heat and you have melted plastic, burnt wiring behind the plaster and in the worst case scenario you have a fire that began in a cavity behind a wall that you never saw the smoke until it was too late.
Signs you are Depending on Cords too much
Look about the house to-night and see about these. When you see two or three, then it is worth something to do.
- Warm plugs or cords. Place your hand on the plug in the wall, and also on the cord itself next to the plug. When it feels hot, then it is resistance becoming heat. Unplug it.
- The classic daisy chain. Power board is connected to an extension cord, which is fed to another extension cord. Each connection point is a potential failure point. It's also usually a sign you're running way too much gear off one single socket.
- Cords under rugs or furniture. Walking on a cord crushes the insulation inside. You can't see the damage, but the copper strands inside can break, creating a hot spot that arcs and melts the rug from underneath.
- The outdoor permanent setup. Extension lead running out the laundry window to the garden pond pump. It's been there since last winter. UV from the sun makes the plastic outer sheath go brittle and crack. Then rain gets in.
The Shed and Workshop Mistake
I see this one a lot in garages around Eleebana and Warners Bay. Bloke buys a nice new welder or a big dusty table saw. The plug on the machine has that wide earth pin. It’s a 15-amp plug. But the socket in the shed is the standard 10-amp type.
So he buys a little adapter from the hardware store that lets the fat pin fit into the skinny socket. Then he runs a standard 10-amp extension lead out to the driveway.
The machine runs. It seems fine. But inside that cord, the copper is working beyond its rating. The insulation is softening. The adapter itself is a known weak point. I’ve pulled burnt adapters out of shed walls more times than I can count. If your tool has a 15-amp plug, it needs a proper 15-amp circuit run from the switchboard. There’s no safe shortcut.
Adding More Power Points Costs Less Than You Think
The real fix for extension cord addiction isn’t buying a heavy duty cord. It’s adding outlets where you actually need them.
Homes built around Lake Macquarie in the 80s and 90s often have two double sockets per bedroom. That was plenty for a clock radio and a lamp. Now every family member has a phone charger, a laptop, maybe a smart speaker, an electric blanket in winter. The sockets haven’t changed but the demand has.
Getting a licensed electrician to add a double power point on the opposite wall or behind the TV unit is usually a quick job. An hour or two of labour plus materials. Compare that to replacing a burnt out $1,500 fridge or dealing with an insurance claim after a fire, and it’s cheap peace of mind.
When It's Okay to Use an Extension Cord
I’m not saying throw all your cords in the bin. They’re useful tools for the right job.
- Short-term stuff. Vacuuming the car, using the electric hedge trimmer, setting up Christmas lights for a few weeks.
- Check the thickness. If you're running a power tool, use a cord marked 1.5mm² or "Heavy Duty." The thin white cords from the discount shop are for phone chargers and lamps, nothing else.
- Always unwind the reel. If you're using one of those orange reel leads, pull all the cable off the drum before you start using it. A coiled cord carrying current creates a magnetic field that traps heat. Leave it coiled and you'll melt the plastic reel into a solid lump. I've seen it.
A Quick Test You Can Do Right Now
Before you finish reading this, go touch the plug of the nearest extension cord in your house. If it’s warm, unplug it and leave it unplugged. That circuit needs a proper look.
If you’re looking around the room and realising you’ve got cords running everywhere, the answer probably isn’t another power board. It’s a couple of new power points in the spots you actually use.
Matt Farrell Electrical covers Newcastle, Lake Macquarie, and the Central Coast. We can sort out extra power points, check any sockets that are running warm, or give the whole house a once-over with a safety inspection if you’re worried about what’s going on behind the walls. Give us a call and we’ll get you off the extension cord habit for good
FAQS
Forget the age of the cord for a minute. Feel the plug end while it’s been running something for about half an hour. If the plastic is warm, hot, or even soft to the touch, that cord is a problem right now. Also look at the prongs. If the brass is dull brown or blue instead of shiny gold, it’s been arcing and overheating. Bin it.
The surge protector is present to save your computer in the event of lightning strike or a grid spike. It has no effect whatsoever in deterring the cord heating up, losing voltage, or catching fire in case it is under a rug. A surge protector does not render a temporary extension set up permanent. The surge is not the safety hazard, but the long skinny cord and the loose connections.
Even the heaviest cord you are selling at the hardware store is not rated to be exposed to the elements or used 24/7. The plastic is consumed by the sun. Moisture gets in the ends. And the big one: a permanent cord bypasses the safety rules about buried depth and conduit that keep you safe when you’re digging in the garden. If you need permanent power in a shed, you need a proper underground feed installed to a sub-board. Otherwise you’re gambling.
Think of it this way. That one new power point eliminates three extension cords, two power boards, and the fire risk of a cord running under a bed. It also stops your appliances from running hot and dying early. And it adds value to the house. It’s not just a convenience cost. It’s cheaper than replacing a burnt-out fridge motor or dealing with an insurance excess after a small fire.
Anything that creates heat or cold. Space heaters, portable air conditioners, chest freezers, toaster ovens, and kettles. These appliances draw massive current right at startup. A standard extension cord starves them of power, makes them work twice as hard, and turns the cord itself into a heating element. If you must use one for these appliances (and you shouldn’t), it needs to be a 1.5mm² heavy-duty cord that’s fully unwound and only used for the 10 minutes you’re actually using the appliance.
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