Tamper-Resistant Outlets: What They Are and Why Code Requires Them
Tamper-resistant outlets look almost identical to standard ones but have a spring-loaded shutter mechanism inside that blocks kids from sticking objects into the slots. They've been required by code in most new construction and remodels since 2008.
Written by Steven Rotan
Licensed Journeyman Electrician — Oregon #883LR
⚠️ Before you start
- Turn off the breaker for any outlet you're working on and verify it's dead with a tester before removing the cover plate.
- Never bypass or disable the tamper-resistant shutters.
- If you find aluminum wiring, cloth-insulated wiring, or missing ground wires, stop and call a licensed electrician.
- Follow your local electrical codes.
🧰 Tools you'll need
- Screwdriver
- Non-contact voltage tester
- Wire strippers (if rewiring terminals)
What makes an outlet "tamper-resistant"
Look closely at a tamper-resistant receptacle (TR outlets) and you'll notice a small spring-loaded shutter mechanism built into each slot. The shutters only open when something is pushed into both slots at the same time with roughly equal pressure - exactly what happens with a plug, but not with a single object poked into one slot.
It's a purely mechanical solution - no batteries, nothing to fail under normal use.
Why code requires them
The National Electrical Code added the tamper-resistant requirement for most receptacles in dwelling units starting with the 2008 edition. The reasoning: child electrical injuries from sticking objects into outlets used to be common, especially among curious toddlers.
Where they're required
Under current code, TR receptacles are required in essentially every receptacle location in a dwelling unit, with exceptions for outlets more than five and a half feet up, or behind large stationary appliances.
Do you need to retrofit your whole house
Not necessarily - code changes generally aren't retroactive. That said, if you have young children regularly in the house, upgrading outlets in the rooms they spend time in is worthwhile.
How to tell if you already have them
Look closely at the outlet slots for the shutter mechanism, or check for "TR" marked on the face.
When to call a pro
Swapping an existing outlet for a tamper-resistant one is reasonable DIY work if you're comfortable with the power off and verified dead. Call an electrician if the wiring in the box looks damaged, aluminum, or ungrounded.
📞 When to call a professional
Replacing a standard outlet with a tamper-resistant one is manageable DIY work, but call an electrician if you find damaged, ungrounded, or outdated wiring in the box.
Frequently asked questions
How can I tell if an outlet is tamper-resistant without taking it apart?
Look for small "TR" lettering on the face, and look for the visible shutter mechanism in the slots.
Do I have to replace all my outlets if my house was built before 2008?
No, code changes generally aren't retroactive. It's a worthwhile voluntary upgrade if you have young children in the home.
Are tamper-resistant outlets harder to plug things into?
No, once you're inserting a real plug with both prongs, the shutters open normally.
Do tamper-resistant outlets cost a lot more than regular outlets?
The price difference is modest, typically just a few dollars more per outlet.
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