Electrical fire prevention
Electrical faults cause thousands of home fires every year. Most are preventable. The key hazards — overloaded sockets, damaged leads, and unattended appliances — are visible and fixable with a few consistent habits.
Key rule
Never plug more than one high-wattage appliance into a single socket or extension lead. Overloading is the most common cause of electrical fires at home.
Prevention rules
Six rules that prevent electrical fires
One high-wattage appliance per socket
Kettle, microwave, toaster, washing machine — each needs its own socket.
Never daisy-chain extension leads
Plugging one extension lead into another overloads the original socket.
Keep leads in open air
No leads under rugs, carpets, or trapped under furniture legs.
Replace damaged leads immediately
Any fraying, cracking, kinking, or warm plugs — replace before next use.
Do not leave high-risk appliances unattended
Tumble dryers, dishwashers, and washing machines: run when you are home and awake.
Check for safety marks before buying
CE, UKCA (UK), or UL (US) marks indicate independently-tested safety compliance.
Appliances with the highest fire risk
Electrical Safety First data consistently identifies tumble dryers, washing machines, and dishwashers as the appliances most frequently associated with domestic electrical fires. The tumble dryer fire risks guide covers the specific hazards — lint build-up in the drum and filter, and the risk of leaving these appliances running overnight. Run all three unattended only during waking hours, when you can respond to an alarm. Switch off at the socket rather than leaving on standby.
Older wiring and when to get an inspection
Homes built before 1970 may still have original rubber-insulated wiring, which becomes brittle and prone to cracking with age. If you notice any of the following, arrange an Electrical Installation Condition Report (EICR) promptly: older round-pin sockets; fuses (not circuit breakers) in the consumer unit; visible rubber cable anywhere in the home; lights that flicker under load; fuses that trip repeatedly. An EICR from a registered electrician (NICEIC, NAPIT, or ELECSA in the UK) is the only way to identify hidden wiring faults.
RCD protection saves lives
A Residual Current Device (RCD) — or Ground Fault Circuit Interrupter (GFCI) in the US — detects current leaking to earth (often through a person or damaged insulation) and cuts the power in milliseconds, preventing electrocution and reducing arcing fire risk. Check that your consumer unit has RCD protection on all circuits. If it does not, ask a registered electrician about upgrading to a split-load or full RCD consumer unit.
Sources: Electrical Safety First · US CPSC · NFPA 70 NEC
Electrical fire FAQ
Questions about electrical fire prevention
The leading causes of electrical fires in UK homes are: faulty or damaged leads and cables, overloaded sockets and extension leads, misuse of extension leads (daisy-chaining), appliances left on standby or unattended for long periods, and faulty fixed wiring (typically in older properties). Electrical Safety First identifies overloading as particularly common — plugging multiple high-wattage appliances into a single socket via an adaptor. In the US, the US CPSC estimates electrical fires cause approximately 51,000 home fires per year, with arcing faults, overloaded circuits, and cord damage as the primary causes.
Signs of an overloaded circuit include: the socket or plug feels warm or hot to the touch; the fuse trips repeatedly; lights flicker when multiple appliances are running; you can hear buzzing or crackling from a socket or junction box. The Electrical Safety First socket calculator lets you check the total load of devices plugged into a single socket. As a rule of thumb: high-wattage appliances (washing machine, fridge, tumble dryer, microwave, kettle) should each have their own socket. Never exceed the socket's rated current — typically 13 amps (3,120 W) in the UK. Also see our guide on tumble dryer fire risks for appliance-specific advice.
No. Running an extension lead under a carpet or rug prevents heat from dissipating and can cause the insulation to overheat, melt, and ignite. The lead may also be damaged by foot traffic over time, creating an arcing fault that is invisible under the covering. Extension leads should be routed along skirting boards or walls in open air. If you regularly need an extension lead in a location, the correct solution is to have an additional socket installed by a qualified electrician.
An Electrical Installation Condition Report (EICR) should be carried out every 10 years for owner-occupied homes, every 5 years for rented properties (legally required in England), and every 3 years for HMOs (houses of multiple occupation). If your home is more than 25 years old and has never been inspected, arrange an EICR promptly — older wiring (rubber-insulated, aluminium wiring) can be a significant fire risk. In the US, the NFPA 70 National Electrical Code and local building codes govern inspection requirements, which vary by state. If you are renting, see our fire safety for renters guide for information about landlord obligations.
Multi-plug adaptors (block adaptors that plug directly into a socket) are generally lower risk than extension leads, as they do not involve a length of cable that can overheat. However, the same rule applies: do not exceed the socket's rated load (13 A / 3,120 W in the UK). Never plug a multi-plug adaptor into an extension lead or another adaptor. Use adaptors with surge protection if connecting electronics. Choose adaptors with an independently-certified safety mark (BS 1363 in the UK).