Common warning signs of faulty electrical wiring include burning smells, warm or discolored outlets, flickering lights, buzzing sounds and breakers that trip often. Outlets or switches that work only some of the time can also point to wiring problems.
Most wiring sits hidden inside walls, so these outside signs are often the first clue that something is wrong.
Signs You Can Smell, See or Hear
A burning or melting plastic smell is one of the most serious signs. It may mean wire insulation or a device is overheating.
Look for scorch marks, brown or black discoloration and melted plastic around outlets, switches and cover plates. Any outlet or switch that feels warm to the touch deserves attention.
Buzzing, crackling or sizzling sounds from walls, outlets or switches can be associated with loose connections or arcing. Normal wiring should be silent.
If you see smoke or flames, leave the home and call 911. Do not try to fight an electrical fire yourself.
Signs in How Your Electricity Behaves
Lights that flicker or dim, especially in several rooms or when appliances turn on, can suggest a wiring or connection issue. Lights that get brighter and dimmer in odd ways may point to a problem with the neutral connection.
Breakers that trip often, or right after being reset, can be a sign of a short circuit, ground fault or overloaded wiring. GFCI outlets that trip without an obvious reason may also need a closer look.
Outlets that stop working, work only when a plug is wiggled or give mild shocks when touched are warning signs too. A mild shock from an appliance or outlet should always be checked.
Conditions That Raise the Risk
Age is a factor. Older homes may have wiring that has been in place for decades, with insulation that has become brittle. Some older homes in Denver still have knob-and-tube wiring or other outdated systems.
Past do-it-yourself work, rodent damage, water leaks and renovations can also affect wiring. Wires damaged by nails or screws during a remodel can cause problems years later.
Two-prong outlets, very few outlets per room and heavy use of extension cords can be signs that the wiring was not designed for modern needs.
What to Do If You Notice These Signs
Stop using any outlet, switch or fixture that shows heat, smells or damage. If it is safe to reach the panel, switch off the breaker for that circuit.
Do not open walls, boxes or the panel to inspect the wiring yourself. Touching live wiring can cause serious injury.
One sign alone does not confirm a wiring problem. An electrician can test the circuits and inspect connections to find the cause.
If you are noticing any of these signs, our electrical wiring repair page explains how damaged wiring is assessed and fixed. Contact us and describe what you have noticed, and we can help you decide how soon it should be checked.