doodlebreaker

Fact sheet · updated

WHAT THE GUIDANCE SAYS

The switch
flipped down.

A tripped breaker is the fuse box doing its job.

Check what tripped
A white consumer unit on a hallway wall with its cover open, showing a row of circuit breaker switches, one of them flipped down
AI-generated image, not a photograph of a real person or place.

TRIPPEDfor a reason

Circuit breakers switch off when a circuit is overloaded or has a fault, and an RCD switches off when current leaks to earth. UK council and fire service guidance shows a calm way to get the power back and find the cause.

At a glance

≈ 97%

Fixed RCDs found to be reliable

Derbyshire Fire and Rescue Service cites research by the Electrical Safety Council that found fixed RCDs are about 97% reliable, and says reliability improved when people tested them regularly.

RCD RELIABILITY · DERBYSHIRE FIRE & RESCUE

786 a year

Fires a year traced to electrical equipment

Greater Manchester Fire and Rescue Service found an average of 786 fires a year traced to a cause involving electrical equipment between April 2017 and March 2020. Faulty wiring, cabling and plugs caused the most.

ELECTRICAL FIRES · GREATER MANCHESTER FRS

TWO NUMBERS WORTH KNOWING

Small switches,
big job.

One figure on how reliable fixed RCDs are,
one on how often electrical faults start fires.

Buckinghamshire Fire and Rescue Service says over half of all accidental house fires are caused by electricity, and lists fuses that blow or breakers that trip for no obvious reason among the warning signs.

A QUICK FUSE BOX CHECK

What has
gone off?

Pick what you can see to find the usual next step. The bar shows how strongly the guidance points to getting professional help.

Based on UK council housing guidance. If you see scorch marks, smell burning or see sparks, do not reset anything: get a qualified electrician.

Fuse box check

Choose what you see
The whole street is darkLikely a power cut

Check whether neighbouring houses have power. If they are dark too, it is a power cut rather than a tripped switch in your fuse box.

A bulb popped and the lights wentReset, change bulb

A blown light bulb can trip a circuit breaker. Switching the breaker back on should restore all the lights apart from the blown bulb, which you can then replace.

One breaker switch is downUnplug, then reset

Breakers trip when a circuit is overloaded or has a fault. Unplug everything on that circuit, switch it back on, then plug appliances in one at a time to find the culprit.

The RCD switch is downLook for the fault

An RCD switches off if an earth fault develops. Turn appliances off and unplug them, reset, and add them back one by one. A faulty light fitting can also be the cause.

It will not stay on, even unpluggedGet an electrician

If the switch trips with everything unplugged, the breaker or the circuit itself may be faulty. Stop resetting it and call a qualified electrician, or your landlord if you rent.

Sources: Broxtowe Borough Council electrical safety and fault finding leaflet; Nottingham City Homes guide to trip switches.

THE SHORT ANSWER

Find the cause
before you reset.

A breaker that trips once is a message.
One that keeps tripping needs a qualified electrician.

THE FUSE BOX

Know where it is

Your fuse box, or consumer unit, is usually near the electricity meter. Find it before you need it, so you are not hunting by torchlight.

Check what tripped

THE CAUSE

Unplug, then test one by one

Council guidance says to unplug everything on the circuit, reset the switch, then plug appliances back in one at a time to see which one trips it.

The steps

THE RCD

Press the test button

An RCD switches off the supply if an earth fault develops. One council leaflet says to test it quarterly with the button marked T or Test.

See the numbers
A fingertip pressing the small test button on a residual current device inside an open consumer unit
AI-generated image, not a photograph of a real person or place.

FOUR CALM STEPS

Power back on,
cause found.

These steps come from UK council housing guidance for tenants. They need no tools, only a torch and a little patience.

  1. Check the neighbours

    If the houses around you are dark too, it is a power cut, not your fuse box.

  2. Unplug everything on the circuit

    Switch off and unplug all the appliances, then put the tripped switch back to on. It should stay on.

  3. Plug back in one at a time

    Switch each appliance on in turn and check the switch after each one. If it trips, the last one you plugged in is the likely culprit.

  4. Stop if it keeps tripping

    If it will not stay on with everything unplugged, or keeps happening, call a qualified electrician or your landlord.

IF YOU RENT

A check every
five years.

In England, landlords must have the electrical installation, including the consumer unit, inspected and tested by a qualified person at least every five years. The result is usually an Electrical Installation Condition Report, or EICR.

The report codes problems C1 (danger present), C2 (potentially dangerous), C3 (improvement recommended) or FI (further investigation required). Required remedial work must be done within 28 days, or sooner if the report says so.

A hand unplugging a kettle from a kitchen wall socket on a worktop beside a toaster
AI-generated image, not a photograph of a real person or place.

Questions

Questions people ask

What is the difference between a breaker and an RCD?

A circuit breaker (MCB) trips automatically when its circuit is overloaded or has a fault. An RCD switches off the supply if an earth fault develops, such as current taking an unintended path, and is far more sensitive than ordinary fuses and breakers.

Which appliances usually trip a breaker?

Broxtowe Borough Council's leaflet says the appliances most likely to trip a breaker are those using and switching large currents, such as cookers, kettles, fridges and washing machines. A blown light bulb can trip a lighting circuit too.

How often should I press the RCD test button?

Broxtowe Borough Council's leaflet says to test it quarterly by pressing the button marked T or Test. The RCD should switch off the supply; switch it back on to restore power. If it does not switch off, report it.

My fuse box has no RCD. Is that unsafe?

Not necessarily. Derbyshire Fire and Rescue Service notes that BS 7671:2008 calls for virtually all circuits in new or rewired homes to have RCD protection. Where there is no fixed RCD, portable plug-in RCDs protect the person using the appliance.

How often should home wiring be checked?

Derbyshire Fire and Rescue Service advises having wiring checked at least every 10 years. In England, landlords must have it inspected and tested at least every five years.

Sources

Where the facts come from

  1. Broxtowe Borough Council: Electrical safety, fault finding and fire safety leaflet
  2. Nottingham City Homes: How to guides, trip switches
  3. Derbyshire Fire and Rescue Service: Residual current devices can save lives
  4. GOV.UK: Electrical safety standards in the private and social rented sectors, guidance
  5. Buckinghamshire Fire and Rescue Service: Electrical safety
  6. Greater Manchester Fire and Rescue Service: Nearly 800 fires a year caused by electrical appliances

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