What does a burning smell from an outlet mean?

A burning smell from an outlet means something in the outlet, its wiring or the plug is overheating. Stop using it now. The U.S. Consumer Product Safety Commission (CPSC) notes that burned or overheated wires often give off an odor of hot insulation,^[1] and the cause is behind the cover plate, where you cannot see it. Treat it as a fire risk until a licensed electrician says otherwise.

What to do right now

First decide whether this is an emergency. If you see smoke, flames or sparks, or the smell is strong, leave the house and call 911. If the smell is faint and there is no smoke, work through this list:

• Unplug whatever is in that outlet and anything on the same wall, but only if the plug is cool and you can reach it without touching the outlet itself.
• Switch off the circuit's breaker if you can do so safely. The U.S. Fire Administration notes that turning power off to the residence is an important step, if it is possible to do so.^[3]
• Never use water on an electrical fire. Using water to put out an electrical fire can cause electrocution.^[3]
• Keep the outlet switched off and keep people and pets away from it until it has been checked.

Do not keep using it to see whether the smell comes back. Wiring that smolders inside a wall can look fine from the room. Electrical fires that start in walls can smolder for some time, and by the time the fire is detected it most likely has already spread within the walls, unseen.^[3]

Common causes

A loose connection. A wire that is not tight on its screw or terminal makes a poor contact, and a poor contact heats up. The CPSC says a loose connection cannot carry much current without getting hot.^[2] Outlets wired with push-in "back-wire" holes rather than screws are a known weak point: the CPSC says these connections may tend to loosen and overheat.^[1]

A worn outlet. If plugs fall out or wobble, the contacts inside have lost their grip. Loose-fitting plugs can cause overheating and fires.^[2] The CPSC says the outlet probably needs to be replaced by a qualified electrician if most plugs fit loosely.^[1]

A damaged plug or cord. If a plug feels unusually warm or hot, the CPSC says it may melt, smoke or give off odors, and advises that you unplug and stop using the appliance and have the cord replaced by a qualified repairman.^[1] If a new cord or plug also overheats, the outlet is the problem.

An overloaded circuit. Space heaters, power strips and extension cords on one outlet can draw more current than the wiring was built for. Tripping breakers alongside the smell point to this. Never swap in a higher-rated breaker; the CPSC warns against it.^[1]

Older wiring. Aluminum wiring connected to outlets and switches can loosen during use, lose good electrical contact and overheat, and the CPSC says to contact a qualified electrician to determine a reliable way of repairing it.^[1]

Other signs that come with it

A smell rarely arrives alone. The CPSC lists arcs and sparks, sizzles and buzzes, overheating, odors and electrical shocks among the warning signs of a wiring hazard.^[1] Check, without touching the outlet with bare fingers if it looks scorched:

• a cover plate or outlet that is discolored, brown or melted
• a buzzing or crackling sound
• a faceplate that is hot. Plates may be warm but should never be hot to the point of pain or discolored from heat, the CPSC says, and if one is hot you should stop using that outlet immediately and get an electrician's help as soon as possible.^[1]
• any shock, even a mild tingle, which may be a warning of danger^[1]

Not every smell is wiring. A new plug-in appliance, dust burning off a heater on its first cold day or a dimmer switch can smell for a few minutes. Some dimmer switches may warm during normal use,^[2] but an odor that persists, returns or comes from an ordinary outlet is not normal.

What an electrician will do

A licensed electrician will turn the circuit off, take the cover plate off and look for scorching, melted insulation and loose terminals. They test the circuit, then replace the outlet, repair or replace burnt wire and fix connections. If the heat damage runs into the wall, the job grows; see what repairing damaged wiring in a wall involves. For pricing, read how much electrical wiring repair costs in Virginia. The electrician may also check other outlets on the circuit, since power often passes through several of them.

To judge urgency, see when a wiring problem is an emergency.

When to call a licensed pro

For every burning smell from an outlet, because the fault is inside electrical wiring that you should not open. In 2021, an estimated 24,200 residential building electrical fires were reported to United States fire departments, causing an estimated 295 deaths, 900 injuries and over $1.2 billion in property loss.^[4]

Virginia law defines a tradesman as anyone who works for the general public for compensation in the electrical, plumbing and HVAC trades.^[5] No individual may work as a tradesman unless licensed, though someone working under the supervision of a tradesman licensed in that specialty does not need their own licence.^[6] Ask to see the licence, and get the price in writing before work begins. DPOR advises getting at least three written bids,^[7] though in a safety situation, make the circuit safe first and compare bids for any larger repair afterward.

Loclis lists DPOR-licensed electrical businesses with their licence number and class. Browse electrical repair services or read more electrical repair answers.

If the smell has gone but you do not know why, describe the job once and licensed local electricians quote it.