WHAT'S THE BUZZ AROUND YOUR HOME OR BUSINESS???

Arcing, Overheating & Fire Risk

We regularly encounter electrical panels that appear “normal” on the outside but contain hidden conditions that could easily lead to catastrophic equipment failure, fire, or serious injury.

The photos below are from a recent field inspection that revealed the cause of the homeowner's sporadic buzzing/humming from their indoor power panel.

What Is Electrical Arcing?

Electrical arcing occurs when electricity jumps through the air between conductors or other electrical components instead of traveling cleanly along its intended path.

This can happen because of:

• Loose breaker connections (as in this instance)

• Corroded or oxidized terminals

• Worn breaker stabs

• Improperly torqued lugs

• Overloaded circuits

• Aging electrical equipment

• Damaged bus bars

• Moisture intrusion

• Vibration or thermal cycling loosens connections over time

When arcing occurs, temperatures can rise extremely fast. Frequently, temperatures are hot enough to melt insulation, destroy breaker components, carbonize panel interiors, and ignite surrounding combustible materials.

What We Found in This Panel

The images from this inspection revealed several serious warning signs:

Evidence of Progressive Heat Damage

The breaker housing showed charring, melting, and discoloration consistent with prolonged overheating.

This was not an instantaneous failure—it developed gradually over time. This is one of the greatest dangers of electrical arcing: many failures develop silently and invisibly until smoke, fire, or catastrophic failure finally occurs.

Damaged Bus Bar

The panel bus bar itself exhibited clear evidence of arcing and thermal destruction.

Once a bus bar has been damaged in this manner, simply replacing the breaker is often insufficient to remedy this situation.

Common Warning Signs Homeowners and Facility Managers Ignore

Many dangerous electrical conditions give warning signs long before failure occurs.

Pay attention if you notice:

• Flickering or dimming lights

• Buzzing or crackling sounds near panels

• Warm breakers or panel covers

• A burning or “hot electrical” smell

• Frequent breaker tripping

• Discolored breakers or panel interiors

• Scorch marks

• Intermittent power loss

• Breakers that feel loose

• Older panels struggling with modern loads

Industry-Recognized Recommendations for Prevention

1. Schedule Periodic Electrical Inspections

Older homes, commercial buildings, HOAs, industrial facilities, and marina/pool infrastructure should undergo periodic inspections by qualified electrical professionals.

This is especially important for:

• Panels over 20–30 years old

• Aluminum branch wiring systems

• High-load equipment

• Coastal environments

• Facilities with vibration or moisture exposure

2. Most Effective Inspections Include:

• Infrared thermography is one of the best ways to detect loose or overheating connections before catastrophic failure occurs.

• Load analysis and load balancing of the power panel.

• Inspection of terminations for proper torque, which would include:

  • Breaker terminals

  • Lugs

  • Neutral bars

  • Ground bars

Improper tightening—or simply “hand-tightening”—can create dangerous high-resistance connections over time.

3. Upgrade Aging Electrical Panels

Many older panels were never designed for today’s electrical demands:

• EV chargers

• HVAC upgrades

• Tankless water heaters

• Large appliances

• Home offices

• Electronics

When to Call an Electrician Immediately

If you notice ANY of the following:

• Burning smell

• Buzzing from a power panel

• Smoke

• Scorch marks

• Warm or hot breakers

• Flickering lights

• Crackling sounds

• Melted insulation

  
  

These are emergency warning signs that require immediate professional evaluation.

Final Thoughts

Many electrical failures develop slowly through the years when connections heat and cool repeatedly, thus loosening occurs sight unseen. This type of unseen danger is the cause of many fires.

Preventive inspection and maintenance are far less expensive than the cost of recovering from a catastrophic electrical failure or a fire.

Need an Electrical Safety Inspection?

North Brunswick Electrical Contractors, Inc. provides professional electrical troubleshooting, panel inspections, thermal diagnostics, repairs, and upgrades throughout southeastern North Carolina.

Serving:

• Wilmington

• Leland

• Brunswick County

• New Hanover County

• surrounding coastal communities

Contact us today to schedule an inspection before hidden electrical damage becomes a fire hazard.