Christmas Lights Tripping the Breaker? Here's Why
Holiday lights trip breakers for one of two reasons: you've simply plugged in more load than the circuit can handle, or there's a short somewhere in an old string, a wet connection, or an overloaded extension cord. Here's how to tell which one you've got.
Written by Steven Rotan
Licensed Journeyman Electrician — Oregon #883LR
⚠️ Before you start
- Never plug light strings into a non-GFCI outdoor outlet.
- Inspect every string for cracked sockets, exposed wire, or chew marks before plugging in each season.
- Keep plug connections up off wet ground and out of standing water.
- If a GFCI won't hold a reset with everything unplugged, stop and call an electrician.
🧰 Tools you'll need
- Outdoor-rated extension cords
- Weatherproof outlet cover
- Non-contact voltage tester (optional)
The two different kinds of "trip"
A GFCI outlet trips when it senses electricity leaking somewhere it shouldn't - usually moisture getting into a plug connection, a cracked bulb socket, or a nicked wire. This is the most common cause of holiday light problems outdoors.
A breaker in the panel trips when the total load on that circuit exceeds what the wire and breaker are rated for - typically 15 or 20 amps.
Start with GFCI resets
If your outdoor lights are plugged into a garage, patio, or exterior outlet, it's almost certainly GFCI protected. Press RESET on any outdoor or garage GFCI outlets before you touch the panel at all.
If it trips again immediately after reset, don't keep resetting it - that's telling you there's an actual short, not a fluke.
Check for the usual culprits
- Wet connections. Any plug-to-plug connection sitting in snow or wet grass will eventually trip a GFCI.
- Old or damaged strings. A cracked socket or a pinched wire can cause a short. Test strings section by section.
- Too many strings daisy-chained together. Most incandescent strings are rated for a max of about three connected end to end.
- Extension cords doing too much. Use outdoor-rated, appropriately gauged cords for a whole yard display.
Doing the math on circuit load
A standard 15-amp circuit can handle about 1,800 watts total, and you should leave headroom - around 1,440 watts, especially if anything else shares that circuit.
LED lights use a fraction of what old incandescent strings do - swapping to LED can cut your load by 80-90%.
When to call a pro
If a GFCI won't hold a reset after you've removed all the lights, or a breaker trips with nothing plugged in at all, the fault is in your home's wiring - call a licensed electrician. Also call if you find any melted plug, warm outlet, or scorched cord.
📞 When to call a professional
If a GFCI won't hold its reset with all lights unplugged, if a regular breaker trips with nothing connected, or if you find melted plugs or warm outlets, stop and call a licensed electrician before using that circuit again.
Frequently asked questions
Why do my outdoor Christmas lights trip the GFCI every year?
Moisture is the number one cause - plug connections sitting in wet grass, snow, or rain eventually trip a GFCI even with no actual damage to the lights.
How many light strings can I safely connect end to end?
Check the tag on your specific lights, but for most incandescent strings the limit is around three. LED strings can often handle more.
Is it safe to keep resetting a breaker that keeps tripping?
No. If a breaker or GFCI trips again right after you reset it, that's a sign of a real short or overload, not a fluke.
Do LED Christmas lights really use that much less power than old-style lights?
Yes, significantly - a string of LED lights typically uses 80-90% less electricity than the same length of old incandescent lights.
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