A 15 amp power point is a socket outlet rated to supply up to 15 amps, about 3,600 watts at 230 volts, compared with 10 amps for a standard outlet. A 15 amp plug has a wider earth pin, so it will not fit a normal 10 amp power point, but a 10 amp plug fits a 15 amp outlet.
Most people only discover the difference when they unbox a new appliance and the plug will not go into the wall. It usually happens with a caravan lead, a bigger air compressor, a welder or a portable EV charger. This guide explains what the 15 amp outlet is for, why the plugs are shaped to stop you mixing them up, and what is involved in getting one installed.
What is the difference between a 10 amp and a 15 amp power point?
The only visible difference is the earth slot, but behind the wall a 15 amp outlet needs cable and protection sized for the extra current. Australian plugs and sockets are made to AS/NZS 3112. The active and neutral pins are the same on both ratings. The earth pin on a 15 amp plug is wider, and the earth slot on a 15 amp outlet is cut wide to match.
| Feature | 10 amp power point | 15 amp power point |
|---|---|---|
| Maximum load | About 2,400 watts | About 3,600 watts |
| Earth pin and slot | Standard width | Wider |
| Accepts a 10 amp plug | Yes | Yes |
| Accepts a 15 amp plug | No | Yes |
| Typical circuit | Shared with other power points | Usually its own circuit |
Behind the wall, a 15 amp outlet is normally run in heavier cable and protected by a circuit breaker sized to suit, with a safety switch on the circuit as required for new socket outlets under AS/NZS 3000. In most homes that means a new circuit from the switchboard rather than a swap of the wall plate.
Why won't a 15 amp plug fit in a normal power point?
The wider earth pin is there on purpose, to stop a heavy appliance being plugged into a circuit that was never built to carry it. A standard power point circuit is shared by several outlets and is designed around 10 amp loads. If a 15 amp appliance could run on it, the cable could carry more current than it is rated for over long periods, and the outlet itself could overheat.
That is also why the shortcuts are dangerous. Filing down the earth pin, cutting it off or wiring a home-made adaptor defeats the protection the plug design gives you. A missing earth pin removes the path that makes a breaker or safety switch trip when the appliance develops a fault, so its metal case can become live. Some commercially made adaptors have their own built-in overcurrent protection and are sold for specific uses such as caravans, but a cheap adaptor that simply joins a 15 amp plug to a 10 amp pin set is not a fix. Running the appliance through a chain of power boards is no better, for the reasons we cover in can you daisy chain power boards.
What appliances need a 15 amp power point?
Anything that draws more than about 2,400 watts on a plug and lead will usually come with a 15 amp plug. In Sydney homes, the most common ones we see are:
- Caravans and motorhomes. Caravan inlets and leads are commonly 15 amp, which is why plugging in at home is such a frequent question.
- Portable EV chargers. Many "granny chargers" come with a 10 amp plug, but 15 amp versions charge faster. For daily charging, a wall-mounted unit is usually the better answer, as explained in our home EV charger guide.
- Workshop equipment. Larger air compressors, welders, table saws and kilns.
- Pool, spa and outdoor equipment. Some spa heaters and larger pool pumps ship with a 15 amp plug rather than being hardwired.
- Commercial-style kitchen gear. Some larger coffee machines, urns and induction units sold for home use.
Check the rating plate or the plug before you buy. If the plug has the wide earth pin, plan for the outlet before the appliance arrives.
New appliance with a plug that will not fit?
DM Electrical can check your switchboard, run a new circuit and fit a 15 amp outlet where you need it, indoors or out. Based in Brookvale, Level 1 and Level 2 ASP accredited, working across the Northern Beaches and wider Sydney.
Can you change a 10 amp power point to 15 amp?
Only if the circuit behind it is rated for 15 amps, and in most homes it is not, so the usual answer is a new circuit. Swapping the wall plate for a 15 amp outlet on a shared 10 amp circuit would let a heavy load onto cable that was never sized for it. An electrician first checks what cable runs to that spot, what breaker protects it and what else is on the circuit.
When a new circuit is needed, the job usually looks like this:
- Check the switchboard. There needs to be space for a new breaker and safety switch protection. Older ceramic fuse boards often need work first, which we explain in what is a ceramic fuse.
- Check the supply. A large new load on top of air conditioning, an oven and hot water can push a home close to its supply limit. The electrician weighs up the total demand, not only the new outlet.
- Run the cable. A new cable from the board to the outlet location, sized for the load and the length of the run.
- Fit and test. Install the outlet, test the circuit and safety switch, and lodge the required compliance certificate.
A circuit that feeds one outlet for one appliance is called a dedicated circuit, and our guide to what a dedicated circuit is covers why heavy loads get one. In NSW this is all licensed electrical work, so it is not a DIY job.
Can a 15 amp power point go outside?
Yes, and outdoor 15 amp outlets are common for caravans, workshops and pool equipment, as long as the outlet is weatherproof and suits where it is mounted. An outdoor outlet needs an IP rating that matches its exposure, a lid that keeps water out while a lead is plugged in, and safety switch protection. On the Northern Beaches, salt air is another reason to choose quality fittings. Our guide to outdoor power points explains the IP ratings in more detail.
For a caravan, the outlet is usually placed near where the van parks so the lead runs straight in without crossing a driveway. A 15 amp extension lead should be heavy duty and fully unrolled when in use, because a coiled lead under load can heat up.
Frequently asked questions
Can I plug a 10 amp appliance into a 15 amp power point?
Yes. A 15 amp outlet accepts both 10 amp and 15 amp plugs, so it works with ordinary appliances as well as heavier ones.
Can I use an adaptor to plug a 15 amp lead into a 10 amp power point?
A simple adaptor or a filed-down earth pin is not safe, because it lets a 15 amp load run on a circuit built for 10 amps. Some commercially made adaptors include their own overcurrent protection for specific uses such as caravans, but the safe long-term fix is a 15 amp outlet on a suitable circuit.
How can I tell if a power point is 15 amp?
Look at the earth slot, the vertical slot at the bottom. On a 15 amp outlet it is noticeably wider than the other two slots. Many 15 amp outlets are also marked 15A on the face.
Do I need an electrician to install a 15 amp power point?
Yes. In NSW, installing an outlet or a new circuit is electrical wiring work that must be done by a licensed electrician, who will also check that the circuit and switchboard can carry the load.
The bottom line
A 15 amp power point lets you run heavier appliances safely, and its wider earth slot is what keeps those appliances off circuits that cannot carry them. If a new caravan, compressor or charger arrives with a plug that will not fit, the fix is a properly rated outlet on a circuit built for it. Get in touch and we will check your switchboard and tell you what is needed to get it running.