A buzzing or humming noise from your switchboard can range from normal to dangerous. A faint hum from circuit breakers under load is normal. However, loud buzzing, crackling, or a buzz that changes pitch could indicate loose connections, an overloaded circuit, or a failing breaker — all of which are fire hazards that need immediate attention from a licensed electrician.
What to do right now
- 1
Assess the noise
A quiet, consistent hum is usually normal. Loud buzzing, intermittent crackling, or a noise that gets louder over time is cause for concern. If you smell burning or see sparks, turn off the main switch immediately.
- 2
Check for signs of damage
Look at the switchboard panel (don't touch anything inside). Scorch marks, discolouration, melted plastic, or a burning smell are all warning signs of a serious fault.
- 3
Reduce electrical load
Turn off high-draw appliances (heaters, ovens, air conditioning) to see if the buzzing stops. If it does, your circuits may be overloaded and need redistribution by an electrician.
- 4
Call an electrician
If the buzzing is loud, accompanied by burning smells, or doesn't stop when you reduce load — call an electrician promptly. Don't delay on switchboard issues as they can cause electrical fires.
When to call an emergency electrician
- ⚠️The buzzing is loud, getting louder, or accompanied by crackling
- ⚠️You can smell burning near the switchboard
- ⚠️There are visible scorch marks or melted plastic on breakers
- ⚠️Circuit breakers feel hot to the touch
- ⚠️The buzzing started suddenly and wasn't there before
- ⚠️Lights in the house are dimming or flickering along with the buzzing
How much does it cost?
A switchboard inspection and tightening of connections typically costs $150–$350. If a faulty breaker needs replacement, add $80–$200 per breaker. A full switchboard upgrade (if the board is old or undersized) costs $800–$3,000. After-hours callout fees apply.