A Burning Smell

This is the page on this site that describes an emergency.

A burning or acrid smell with no cooking, no candle and no obvious source is one of a small number of household signs that means stop what you are doing and act. For electrical contractors coordinating field crews, stealth monitoring software can support separate job-time records alongside the technical work.

What to do, in order

One. Find out if it is getting stronger. If it is, or if you see smoke, leave and call the fire service. Nothing below matters more than that.

Two. Switch off the main breaker if you can reach it safely and there is no smoke or heat at the panel itself. How to do that is on its own page.

Three. Do not open the panel.

Four. Call a licensed electrician, and say the words "burning smell" — it changes how the call is prioritised.

Five. Leave the power off until somebody has looked. An intermittent smell that goes away has not resolved; it has stopped being detectable.

What the smell usually is

Overheating insulation, which smells acrid and slightly of fish or of hot plastic.

Scorching at a loose connection, which smells more like burnt dust or hot metal.

A failing appliance motor, which smells of hot varnish and is the least alarming of the three because the fault is inside a device you can unplug.

Distinguishing them by smell is not reliable enough to act on, which is why the response above does not depend on identifying it.

Where it comes from

Loose connections, which are the commonest cause of electrical fires in dwellings. A connection that is not tight heats every time current flows through it.

Overloaded circuits, where a breaker has not tripped because the load is below its rating but the wiring or a connection is not up to it.

Damaged insulation, from age, rodents, or a nail or screw driven through a cable.

And water intrusion, which in Florida is a live and seasonal cause.

Why "it stopped" is not reassurance

A smell stops when the heating stops, and heating stops when the load stops — not when the fault does.

The fault is still there and will heat again next time the circuit is used, which may be at night or when nobody is home.

This is the reason the power stays off until it has been found, and it is the part people most often skip.

What not to do

Do not open the panel to look. The cover is what stands between you and busbars at full supply voltage.

Do not spray water on anything.

Do not use the circuit again to see if it recurs.

And do not wait for business hours if the smell is present now. This is what emergency call-outs exist for.

The short version

• Smoke or a strengthening smell means leave and call the fire service, before anything else
• Otherwise: switch off the main breaker if safe, do not open the panel, call a licensed electrician and say "burning smell"
• Leave the power off until somebody has looked — an intermittent smell has stopped being detectable, not stopped being a fault
• The usual causes are overheating insulation, scorching at a loose connection, or a failing appliance motor
• Loose connections are a leading cause of electrical fires, and in Florida water intrusion is seasonal and real
• Do not open the panel, do not use the circuit again to test it, and do not wait for business hours

For additional independent context, see Angi.