Socket Not Working After Power Cut

One or more sockets stopped working after a power cut or outage and have not come back on.

What's happening?

When power is restored after a cut, most circuits come back automatically. If sockets remain dead after the supply is restored, it usually means the MCB or RCD protecting that circuit tripped during the outage (often from the power surge when supply returns) and has not been manually reset. In some cases, the power surge that accompanies restoration can damage sensitive protective devices or cause a pre-existing weak fault to fully develop.

What usually causes it?

MCB or RCD tripped during the power cut or during supply restoration
Surge on restoration caused a pre-existing weak connection to fail
Voltage spike damaged the MCB or RCD itself
A faulty appliance that was on when power was restored caused the circuit to trip
The power cut was caused by an internal fault that still exists

Is it dangerous?

Not immediately dangerous, but it should not be ignored. If the MCB or RCD has tripped, there may be a reason beyond the power cut — a fault that has worsened. Power surges during restoration can also affect other circuits, so check all sockets and appliances in the house.

Can I fix it myself?

Check your consumer unit. If an MCB or RCD is in the off or middle position, try resetting it. If it stays on, power should be restored. If it trips again, switch off all appliances on that circuit (unplug everything), try resetting, and then plug items back in one by one. If the MCB trips with nothing plugged in, there is a wiring fault.

When should you call an electrician?

Call an electrician if the MCB or RCD will not reset, if it trips repeatedly, or if sockets remain dead despite all circuit breakers appearing to be in the on position. Also call if you notice any appliances behaving strangely after the power cut — a surge may have caused damage.

What will the electrician actually do?

Check all protective devices in the consumer unit for damage
Test each circuit for faults that may have been caused or revealed by the power surge
Inspect connections for signs of arcing or overheating
Replace any damaged MCBs, RCDs, or surge-damaged components
Recommend a surge protection device (SPD) if not already fitted

What will it cost to fix?

£80–£200

If the issue is a tripped MCB that will not reset due to a fault, standard fault-finding rates apply. Replacing a damaged MCB or RCD is additional.

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Frequently asked questions

We’re happy to answer all your questions.

Why did my sockets not come back on after the power cut?

The most likely cause is that the MCB or RCD protecting your socket circuit tripped during the outage and needs manually resetting. Check your consumer unit for any switches in the off or middle position.

Can a power cut damage my electrics?

The power cut itself does not cause damage, but the surge when power is restored can. This surge can trip protective devices, blow sensitive electronics, and worsen pre-existing weak connections.

Should I get a surge protector?

Yes. A Type 2 surge protection device (SPD) fitted in the consumer unit protects your entire installation from voltage spikes. The current edition of BS 7671 recommends SPDs in most new installations.

Sources & References

Socket Not WorkingCaution No Power In The Whole HouseHigh risk No Power After a StormHigh risk Socket Installation Cost£80–£250 Electrical Fault Finding Cost£80–£250

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