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Outdoor Socket Tripping After Rain
Your outdoor socket trips the electrics every time it rains or gets wet.
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What's happening?
Outdoor sockets are exposed to the UK weather and are particularly vulnerable to water ingress. When moisture gets into the socket enclosure or the cabling, it creates an earth fault that trips the RCD. This is a common and potentially dangerous fault, especially if the socket is not correctly rated for outdoor use (IP65 or above).
What usually causes it?
- Damaged or missing weatherproof cover on the outdoor socket
- Degraded IP-rated enclosure letting rain in through cracks or broken seals
- Water tracking along the cable entry point into the socket back box
- Condensation building up inside the enclosure over time
- Incorrect socket type installed — indoor socket used outside
Is it dangerous?
Yes, this is a serious safety risk. Water and electricity are a dangerous combination. If an outdoor socket has water inside it, there is a real risk of electric shock — especially if someone touches it while standing on wet ground. The RCD tripping is doing its job protecting you, but the underlying fault must be fixed. Never attempt to use a wet outdoor socket.
Can I fix it myself?
Do not attempt to open or dry out the socket yourself while it is connected to the supply. You can visually check whether the weatherproof cover is damaged, missing, or not closing properly. If the cover has simply blown open and the socket looks dry inside, closing the cover and resetting the RCD may resolve it temporarily. However, if moisture has entered the socket, you need a professional.
When should you call an electrician?
Call an electrician if the socket trips every time it rains, if you can see moisture or corrosion inside the enclosure, if the existing socket does not have a proper weatherproof cover, or if it was not installed on its own RCD-protected circuit. Outdoor socket installations must comply with BS 7671 and usually require Part P notification.
What will the electrician actually do?
- Isolate the circuit and inspect the outdoor socket for water ingress and corrosion
- Test the circuit insulation resistance to check for moisture damage in the cabling
- Replace the socket with a correctly rated IP65 or IP66 weatherproof unit
- Ensure proper cable entry seals and drainage to prevent future water ingress
- Verify the circuit has dedicated RCD protection (30mA) as required by regulations
- Issue a Minor Electrical Installation Works Certificate for the repair
What will it cost to fix?
£100–£250
Replacing an outdoor socket with a properly rated IP65 unit including labour. A new outdoor circuit from the consumer unit will cost more (typically £250–£450).
Find an electricianFrequently asked questions
We’re happy to answer all your questions.
Why does my outdoor socket only trip when it rains?
Rainwater is getting into the socket enclosure or the cable connections. The moisture creates a path for current to leak to earth, which trips the RCD. The socket enclosure needs replacing or resealing.
What IP rating should an outdoor socket have?
Outdoor sockets in the UK should be rated at least IP65 (protected against water jets from any direction). For very exposed locations, IP66 is preferable. Indoor sockets are typically IP20 and must never be used outside.
Can I just wrap it in plastic to keep the rain out?
No. This is not a safe or compliant solution and can actually trap moisture inside. A proper IP-rated weatherproof enclosure with correct cable glands is the only safe approach.
Does an outdoor socket need its own circuit?
Current regulations (BS 7671 18th Edition) require outdoor circuits to have their own RCD protection. A dedicated circuit is best practice so a fault does not trip other circuits in the house.
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