Extension sockets and adapters
If an extension lead must be used, it must be 3-core (with an earth wire), rated for at least 13 amps, fully unwound if it is a reel type, and positioned where it cannot get wet. Never use two large appliances on the same extension or multi-socket adapter – the combined current draw can exceed 13 amps and cause overheating.
Washing machines, tumble dryers, and dishwashers draw close to 10 to 13 amps and should be connected directly to a dedicated wall socket wherever possible. Extension leads and multi-socket adapters introduce additional connection points that can overheat, and most manufacturer instruction books specifically advise against their use with large appliances.
Extension leads and multi-socket adapters are used in virtually every home, and sold in their millions. They are legal products and can be used safely. The issue with large white goods appliances is specific: the current they draw, combined with the extra connection points and potentially lower-rated cable of an extension lead, creates a genuine overheating risk that a direct wall socket connection does not.
Why Large Appliances Are Different
The problem is not that extension leads are inherently dangerous – it is that they are frequently used with appliances drawing far more current than the lead was designed for, or in combinations that exceed the 13-amp limit of a standard UK wall socket.
| Appliance type | Approximate current draw | Extension lead risk |
|---|---|---|
| Washing machine | 10 to 13 amps | High – near the maximum for a single socket |
| Tumble dryer | 10 to 13 amps | High – never combine with any other large appliance |
| Dishwasher | 8 to 10 amps | High – leave little headroom for any other device |
| Microwave | 4 to 7 amps | Medium – dangerous if combined with any large appliance |
| Kettle | 8 to 13 amps | High – never combine with a washing machine or dryer |
| Phone charger, lamp, router | Under 1 amp each | Low – safe to combine on a multi-socket extension |
A washing machine and a kettle running simultaneously on the same extension or socket will exceed 13 amps and cause overheating. A radio, two lamps, and a phone charger combined will draw less than 3 amps – well within any extension lead’s capacity.
“Do not connect via an extension lead. Extension leads do not guarantee the required safety of the appliance (e.g. danger of overheating).”
Miele washing machine instruction manual
“Do not connect the appliance by an extension lead, multi socket adaptor or similar. These can overheat and are a fire hazard.”
Miele tumble dryer instruction manual
If an Extension Lead Must Be Used: The Requirements
Must be 3-core with an earth wire
A 2-core extension lead has no earth. Using a large appliance without an earth connection puts the user at risk of electric shock if the appliance develops an insulation fault. See our guide on electric shocks from washing machines for more on why earthing matters.
Must be rated for 13 amps
Many extension leads use thinner cable than the appliance’s own flex, rated for 5 or 10 amps. If the cable is noticeably thinner than the appliance’s cable, it is not suitable. A 10-amp rated extension used with a washing machine drawing 13 amps will overheat.
As short as possible
Longer cable means more resistance and more heat generated. Use the shortest extension that achieves the connection needed. Do not coil unused cable – lay it out fully.
Not positioned where it could get wet
If the washing machine leaks, a live extension socket on the floor behind or beside it becomes extremely dangerous. Position any extension socket at worktop height or somewhere it cannot be reached by water from a leak or overflow.
Reel-Type Extension Cables: A Specific Danger
Extension cables on a reel must be fully unwound before use. Wound cable acts as an inductor – it generates heat when current flows through it. All reel-type extensions have two current ratings printed on the body: one for fully unwound and a lower rating for wound or partially wound. The wound rating is typically around 10 amps – which is insufficient for a washing machine, dryer, or dishwasher drawing up to 13 amps.
Do not use a reel-type extension lead as a permanent connection for a large appliance. Even when fully unwound, many reel extensions are only rated for 10 amps – below the requirement for a washing machine or dryer. Avoid them for white goods entirely where possible.
How to Calculate Whether You Are Overloading a Socket
The 13-amp limit applies to the total current draw of everything connected to a single socket or extension. You can check your own combination using the formula below.
Amps = Watts ÷ Voltage. In the UK, use 240 volts for this calculation. Do not use the fuse rating of the appliance as its amp draw – these are different figures.
The wattage of each appliance is on its rating plate – usually found on the back of the machine, inside the door, or on the underside. As an example: a dishwasher rated at 1930W draws 1930 ÷ 240 = 8.04 amps. A toaster rated at 930W draws 930 ÷ 240 = 3.87 amps. Combined, those two appliances draw 11.91 amps – within the 13-amp limit. Adding a washing machine drawing 10+ amps would take the total well over the limit.
The Socket Overload Calculator from Electrical Safety First can help with this calculation if you prefer not to do it manually.
For help finding the rating plate or model number on specific appliance types, see our guides on how to find an appliance model number and where to find the model number on a fridge or freezer.
The Warning Sign: A Fishy Smell Near Appliances
A strange fishy or burning plastic smell near an appliance, plug, or socket that has no other obvious explanation is a warning sign of electrical overheating. Burning or arcing in plastic components – plugs, sockets, adapters, and extension leads – can produce this distinctive smell before any visible damage appears.
Unplug the appliance and inspect the plug, socket, and any extension lead for discolouration, melting, or scorch marks. A discoloured plug or socket face indicates overheating that must be investigated before the appliance is used again. Do not ignore this warning sign.
Related Safety and Electrical Guides
Related Guides
Electric Shocks or Tingles From a Washing MachineWhy a missing or broken earth connection causes shocks – and why it must be investigated immediately.
Washing Machine Tripping the ElectricsCauses of a washing machine tripping an RCD or blowing a fuse – and how to diagnose them.
Is It Safe to Leave the Washing Machine On?The genuine fire risk from unattended appliances and how to manage it safely.
8 Ways to Make Appliances SaferPractical steps every household can take to reduce fire, flood, and electrical risks from large appliances.
Frequently Asked Questions
Can I plug a washing machine into an extension lead?
Ideally not – manufacturers including Miele explicitly advise against it in their instruction manuals. If it is unavoidable, the extension must be 3-core with an earth wire, rated for at least 13 amps, as short as possible, fully unwound if it is a reel type, and positioned where it cannot get wet. Never use the washing machine and another large appliance on the same extension.
Can I plug two large appliances into the same extension lead?
Not if either is a washing machine, tumble dryer, or dishwasher. These appliances draw 10 to 13 amps individually – two together would exceed the 13-amp maximum of a standard UK socket and cause the extension lead to overheat. Even two moderate appliances – a washing machine and a microwave or kettle – can exceed this limit.
How do I know if my extension lead is rated for 13 amps?
Check the rating printed on the body of the extension lead or on the plug. If the cable appears noticeably thinner than the appliance’s own flex, it is likely rated below 13 amps. Do not guess – only use an extension if you can confirm it is rated for 13 amps and has a 3-pin plug with an earth pin.
Does a reel extension lead need to be fully unwound?
Yes, always. Wound cable generates heat when current flows through it. Reel-type extension leads have two amp ratings – one for fully unwound and a lower one for wound or partially wound. The wound rating is typically around 10 amps, which is insufficient for a washing machine or dryer. Always fully unwind a reel extension before use and avoid this type for permanent large appliance connections.
What does a fishy smell near a plug or socket mean?
A fishy or burning plastic smell near an appliance, plug, socket, or extension lead that has no other explanation is a warning sign of electrical overheating. Unplug the appliance and inspect all connections for discolouration, melting, or scorch marks. Do not use the appliance or socket again until the cause has been identified and made safe.
Children & pets dying in washing machines and tumble dryers
Always look inside the drum before loading and starting any cycle – this single habit prevents most child and pet entrapment incidents. Use the machine’s child lock when children are in the house, switch the appliance off at the socket when not in use, and never leave children or pets unsupervised near large appliances with doors large enough to enter.
This is a genuine and serious risk that is easy to overlook. A child can climb inside an appliance and be accidentally started up by another child, or remain hidden inside without being noticed before the door is closed and a cycle is started. The precautions below are simple and could prevent a tragedy.
Washing machines, tumble dryers, and other large appliances with doors large enough for a child to enter present a specific safety risk that most adults do not routinely think about. Awareness and a small number of consistent habits significantly reduce this risk.
How Children Are Put at Risk
Children are put at risk in appliances in two main ways. First, a child climbs inside voluntarily – thinking it is a hiding place – and a sibling or playmate closes the door and starts the machine. Second, a child is simply not seen inside the drum before the door is closed and the cycle started. A small child who thinks they are playing hide and seek may deliberately stay quiet and still even if they are aware an adult is looking for them.
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Always look inside the drum before starting any cycle. Make this a non-negotiable habit, not an occasional check. Open the door, physically look inside, then load and start. -
Use the child lock if your machine has one. Many modern washing machines have an electronic child lock that prevents the machine being started with a specific button combination. Check the instruction manual and use it whenever children are in the house. Some also have physical door locks. -
Switch the appliance off at the socket when not in use. A machine that is unplugged or switched off at the wall cannot be started by a child playing with the controls – even if another child is inside the drum. This is especially important for tumble dryers, which run for extended periods. -
Do not leave children unsupervised near large appliances. Children are drawn to appliances with large doors by curiosity. Supervise access to the kitchen or utility room where appliances are installed.
Pets Inside Appliances
Cats in particular are drawn to the warmth and enclosed space of a washing machine drum. Pets have been seriously injured and killed after being accidentally started in washing machines, tumble dryers, and dishwashers when owners have thrown items in and started the machine without checking inside first. This is not a theoretical risk – it happens with enough regularity to appear in news reports.
BBC News has reported incidents including a kitten who survived a 10-minute wash cycle and a kitten who survived an hour-long spin cycle in Aberdeen. Modern machines use significantly less water than older models, which is the main reason cats in these incidents survived – a washing machine from 20 years ago would have filled with enough water to drown a trapped animal.
This single habit prevents the majority of pet-in-appliance incidents. Open the door, look inside, then load. This takes approximately two seconds and could save your pet’s life.
Do Not Leave Pets in a Room With a Running Appliance
Beyond the risk of pets climbing inside, appliances can injure or kill pets in other ways:
- Fires started by dishwashers, washing machines, or tumble dryers have killed pets left in the room during a cycle. For a specific case, see our guide on dishwasher fire risks and pets
- Door glass explosions on certain washing machine models have thrown glass across a room at significant velocity. See our guide on washing machine door glass danger
- Pets chewing through gas hoses or electrical cables connected to appliances present a serious risk to the animal and to the property
The recommendation not to leave any appliance running unattended applies doubly when pets are in the same room. This is not overcautious – these are documented causes of animal deaths and house fires.
More Appliance Safety Guidance
Related Safety Guides
8 Ways to Make Appliances SaferPractical steps every household can take to reduce fire, electrical, and physical risks from large appliances.
Is It Safe to Leave the Washing Machine On?The genuine risks from unattended appliances – and what the evidence says about running them while out or overnight.
Washing Machine Door Glass DangerExploding door glass – causes, which machines are affected, and what to do.
Dishwasher Fire Risks and PetsA documented case of pets killed in a dishwasher fire – and the broader fire risk from unattended appliances.
Frequently Asked Questions
How can a child get trapped inside a washing machine?
Children climb into washing machines and tumble dryers through curiosity or as part of play – treating the drum as a hiding place. A sibling can then close the door and press start. A child already inside can also be missed when an adult loads the machine without checking the drum first. Children may deliberately stay hidden if they think it is a game, even when they are aware an adult is present.
How do I prevent my cat from getting into the washing machine?
Always look inside the drum before loading and starting any cycle – this one habit prevents the majority of pet-in-appliance incidents. Cats are attracted to the warmth and enclosed space of a drum and may enter in the seconds between you opening the machine and loading it. Keep the machine door closed when not actively loading or unloading. Do not leave the machine running in a room where a cat has unsupervised access.
Is it safe to leave a washing machine or tumble dryer running if pets are in the house?
It is not recommended to leave any large appliance running when no person is in the room to respond to a problem – whether or not pets are present. Fires from dishwashers, washing machines, and tumble dryers have killed pets left in the same room. Do not leave pets locked in a room with a running appliance.
Don’t use fabric softener on children’s sleepwear
The flame-resistant properties built into children’s sleepwear are chemically treated into the fabric. Fabric softener deposits a coating on fibres that interferes with this treatment, reducing its effectiveness over repeated washes. Manufacturers of leading detergent and softener brands explicitly warn against using fabric softener on flame-resistant garments. The rule applies to any garment labelled as flame resistant, not only children’s sleepwear.
Fabric softener reduces the effectiveness of flame-resistant treatments in children’s sleepwear and other garments labelled as flame resistant or flame retardant. This applies to both liquid fabric softener added to the wash and to dryer sheets used in the tumble dryer. Always check the care label on children’s sleepwear and nightwear before adding softener.
What the Warning Means
Most children’s sleepwear and nightwear sold in the UK is required to meet fire safety standards. Garments either use inherently flame-resistant synthetic fibres or are treated with a flame-retardant finish. These treatments do not make the fabric fireproof – they slow the rate at which it ignites and burns, which can be the difference between a minor incident and a serious injury.
“We caution against using any fabric softener on children’s sleepwear or other garments labelled as flame resistant – as it may reduce flame resistance.”
Fabric softener manufacturer product warning
Fabric softener works by coating fibres with a lubricating agent that makes them feel smooth and soft. On flame-resistant garments, this coating sits on top of the flame-retardant treatment and partially blocks it. Over repeated washes with softener, the protective properties of the garment degrade faster than they otherwise would.
Which Garments Are Affected
Children’s sleepwear and nightwear
UK safety regulations require children’s nightwear to meet fire safety performance standards. This covers pyjamas, nightdresses, dressing gowns, and similar items worn to bed. Most children’s sleepwear carries a care label that includes a warning against fabric softener – check the label before washing.
Any garment labelled “flame resistant” or “flame retardant”
The warning is not limited to children’s clothing. Any adult or children’s garment labelled as flame resistant or flame retardant – including some workwear and protective clothing – should not be washed with fabric softener. Check the care label for specific washing instructions.
Flame-resistant fabric slows the rate of ignition and burning – it does not prevent the garment from catching fire. Reducing the flame-resistant treatment through repeated softener use removes even this partial protection. The care label instructions exist for this reason and should be followed.
Fabric Softener and Towels
A related point worth noting: fabric softener has a waterproofing effect on towels and other absorbent fabrics. The same coating that makes fabric feel soft reduces the fibres’ ability to absorb moisture – which directly reduces how effectively a towel dries. Omitting fabric softener from towel washes maintains their absorbency. If the dryer is used, tumble drying itself softens towels without any chemical assistance. See our guide on when fabric softener is unnecessary.
Related Guides
Related Guides
Save on Fabric Softener When Tumble DryingWhy tumble drying naturally softens laundry – and why fabric softener reduces towel absorbency.
Children, Pets, and Appliance SafetyKeeping children and pets safe around washing machines and other domestic appliances.
Fabric Softener Taken Out Too SoonWhy softener is flushed during the wash rather than the rinse – and how to fix it.
Fabric Softener Not Being Taken OutWhy softener remains in the dispenser after the cycle and the common causes.
Frequently Asked Questions
Can I use fabric softener on children’s pyjamas?
Not if they are labelled as flame resistant or flame retardant. Fabric softener reduces the effectiveness of flame-resistant treatments in children’s sleepwear, degrading the protection the garment is designed to provide. Check the care label – most children’s sleepwear will carry a warning against fabric softener. If the label is unclear, it is safer to omit softener from the wash.
Does fabric softener permanently damage flame-resistant clothing?
The effect is cumulative. Each wash with softener further reduces the effectiveness of the flame-resistant treatment. The garment does not become instantly unsafe after one wash with softener, but the protective properties degrade more quickly than they would without softener use. Once reduced, the flame-resistant treatment cannot easily be restored.
Does this apply to dryer sheets as well as liquid softener?
Yes. Dryer sheets work by the same mechanism – depositing a softening coating on fabric fibres during the tumble dry cycle. This coating has the same effect on flame-resistant treatments as liquid fabric softener added to the wash. Both should be avoided on flame-resistant garments.