Loud buzzing from my electrical panel — why?

A loud buzzing from your electrical panel is a serious warning sign that requires immediate attention from a licensed electrician. This sound typically indicates loose connections, overloaded circuits, or failing components that could lead to electrical fires or electrocution.

The most common cause of panel buzzing is loose electrical connections. Over time, the constant heating and cooling cycles cause wire connections to loosen at breakers, bus bars, or the main lugs. When electricity arcs across these loose connections, it creates that distinctive buzzing sound along with dangerous heat buildup. This is especially common in older panels or homes that have experienced temperature fluctuations during New Brunswick's harsh winters.

Overloaded circuits are another frequent culprit. If you're drawing more power than your panel or individual circuits can safely handle, the electrical components will vibrate and buzz under the strain. This often happens when homeowners add new appliances, EV chargers, or space heaters without upgrading their electrical service. In New Brunswick, many older homes still have 100-amp services that struggle with modern electrical demands.

Failing breakers can also cause buzzing, particularly in older panels like Federal Pacific or Zinsco brands that are known fire hazards. These breakers may buzz even when not overloaded, indicating internal component failure. Some breakers naturally hum slightly under load, but loud, persistent buzzing is never normal.

Immediate safety steps: If the buzzing is accompanied by burning smells, sparking, or the panel feels hot to touch, shut off your main breaker immediately and call for emergency electrical service. Even without these additional warning signs, don't ignore panel buzzing – it won't fix itself and will likely worsen.

Under TSANB regulations, any panel repairs or replacements require proper permits and inspections. A licensed electrician will need to identify the source of the buzzing, which may involve thermal imaging to detect hot spots, tightening connections, replacing faulty breakers, or potentially upgrading your entire panel if it's outdated or damaged.

Don't attempt DIY repairs on electrical panels – this is extremely dangerous and illegal in New Brunswick. Panel work requires shutting off power from NB Power, working with high-voltage connections, and ensuring proper grounding and bonding.

Need help finding a qualified electrician for emergency panel service? New Brunswick Electrical can match you with local professionals who offer 24/7 emergency service and can diagnose your buzzing panel safely.