How to Reduce the Risk of Electrical Fires

How to Reduce the Risk of Electrical Fires: What Actually Works

Home electrical fires kill an estimated 527 people a year and injure 1,580 more, with an estimated $2.4 billion in direct property damage, according to NFPA’s 2020-2024 data. They account for about 13% of home structure fires and 18% of home fire deaths. Many electrical fires start in places you do not see. NFPA’s 2020-2024 data show they most often began in a kitchen or cooking area (15%), a bedroom (12%), or an attic or ceiling (9%), and its 2015-2019 analysis found about one in three first ignited part of the building itself, such as framing, insulation, or wall finish (NFPA). Prevention in this context means addressing the ignition mechanism before the fire starts, not responding faster once it does.

Arc Faults: The Leading Cause and the Direct Countermeasure

Arc faults – electrical arcs that occur at damaged or loose connections, within deteriorated insulation, or where wiring has been nicked, pinched, or improperly spliced – sit behind most home electrical distribution fires. In NFPA’s 2015-2019 data, arcing was the heat source in 73% of home fires involving electrical distribution and lighting equipment (NFPA). The temperature of an arc can reach several thousand degrees Celsius, hot enough to ignite nearby paper, insulation, and carpet (CPSC staff paper). A standard circuit breaker responds to overloads and short circuits, so an arc fault can produce heat at current levels below the breaker’s trip point.

The NEC first required AFCI protection in the 1999 edition, for bedroom circuits starting January 1, 2002, and later editions added more rooms (NAHB).

AFCI breakers sense the current signature of dangerous arcing and open the circuit. NEC 2023 section 210.12(B) requires AFCI protection on 120-volt, 10-, 15-, and 20-amp branch circuits in dwelling kitchens, living areas, bedrooms, laundry areas, hallways, closets, and similar rooms (NYEIA summary of the 2023 NEC). California adopted the 2025 California Electrical Code, based on NEC 2023, effective January 1, 2026, and may amend the NEC, so your local building department has the final say (California DGS). When branch circuit wiring in those areas is modified, replaced, or extended, AFCI protection generally has to be added to that circuit (NEC 210.12(D), text). If your home lacks AFCI protection, NFPA advises asking a licensed electrician to install it. Cost depends on the panel and the number of circuits, so get a written quote.

Overloaded Circuits and Connections: The Hidden Fire Starter

An overloaded circuit draws more current than its conductors and connections can safely carry. The excess current heats conductors, insulation, and connection points. A properly sized breaker should trip before that heat becomes dangerous, which is why oversized breakers, loose connections, and damaged cords are the real hazards.

Space heaters are a common overload case. CPSC estimates portable heaters cause about 1,600 fires a year, with an average of 70 deaths and 160 injuries a year from 2019 to 2021, and says to plug electric space heaters directly into a wall outlet, never into an extension cord or power strip (CPSC). Kitchens deserve attention too: countertop receptacles are served by at least two 20-amp small-appliance circuits (NEC 210.11(C)(1), summary), so avoid running several high-draw appliances on one at the same time.

Extension cords used as permanent wiring are the related hazard. Extension cords are designed for temporary use. The NEC does not permit flexible cords as a substitute for the fixed wiring of a structure (400.12, text), and heat can build up in a cord run under a carpet. A 1,500-watt space heater draws 12.5 amps at 120 volts, a heavy load for a light-duty extension cord, so plug heaters straight into a wall outlet.

Service Panel and Wiring Inspection: What to Look For

A service panel inspection by a licensed electrician addresses conditions that contribute to electrical fire risk and that a homeowner cannot safely evaluate from outside the panel (do not remove the panel cover yourself):

• Double-tapped breakers: Two conductors connected to a single breaker terminal without a tandem breaker rating – can create a loose connection point prone to arcing and overheating.
• Aluminum branch circuit wiring: Homes wired between 1965 and the mid-1970s may have aluminum branch circuit wiring. CPSC recommends a permanent repair: replace it with copper, or have a qualified electrician repair the connections with a CPSC-recognized method such as the COPALUM crimp or the AlumiConn connector (CPSC Publication 516).
• Scorching or burn marks: Discoloration inside a panel can indicate overheating. The cause must be identified and corrected before the panel is returned to service.
• Oversized breakers: A 20-amp breaker protecting a circuit with 14 AWG wire (rated for 15 amps) allows overcurrent that can heat the wire to insulation damage temperature before the breaker trips.
• Panel age: Federal Pacific Electric (FPE) Stab-Lok panels were installed in millions of buildings between about 1950 and 1985, and tests by CPSC and independent engineers found that certain Stab-Lok breakers do not trip as UL requires; the usual advice is to replace the whole panel (Hanover Insurance).

Brea Electric’s commercial and residential panel inspection service includes documentation of all identified conditions with photographic evidence – useful for insurance applications and for prioritizing corrections. Our industrial electrical maintenance contracts for commercial customers include quarterly panel and connection inspections as scheduled preventive work, not reactive response.

Practical Steps to Reduce Electrical Fire Risk This Month

1. Replace extension cords in permanent use with added outlets. Have a licensed electrician add the outlet; it needs a permit, and it removes the need for the cord.
2. Have a licensed electrician inspect your service panel if it is old, shows signs of trouble, or has never been evaluated. Many warning signs are only visible with the cover off, which is electrician work.
3. Test every smoke detector in your home once a month by pressing the TEST button. Replace any unit that does not produce a loud alarm, and replace every smoke alarm 10 years after its manufacture date (NFPA).
4. Identify your panel’s brand. Check the name on the panel door or label without removing the cover. If you see Federal Pacific Electric or Stab-Lok, consult a licensed electrician about panel replacement.
5. Do not run several high-draw appliances on the same circuit at once. NEC 210.11(C)(1) calls for at least two 20-amp small-appliance circuits for kitchen countertop outlets, so spread the microwave, toaster, and coffee maker across them, and check each appliance’s manual, since some call for a dedicated circuit.

Key Takeaways

• Arcing was the heat source in 73% of home fires involving electrical distribution and lighting equipment in NFPA’s 2015-2019 data – AFCI breakers are designed to detect arcing and open the circuit.
• Overloaded circuits and extension cords used as permanent wiring are avoidable hazards – added outlets for high-draw appliances, and plugging space heaters straight into the wall, are the practical fixes.
• Old panels, or any panel showing scorching or double-tapped breakers, warrant professional inspection before a fault condition escalates to a fire.
• Federal Pacific Electric Stab-Lok panels have breakers that tests found do not always trip as required – replacing the whole panel is the usual advice, not breaker-by-breaker repair.
• Replace smoke alarms 10 years after their manufacture date and test them monthly (NFPA).

References

1. NFPA, Electrical Home Fire Safety (statistics 2020-2024), https://www.nfpa.org/education-and-research/home-fire-safety/electrical-safety-in-the-home
2. NFPA Research, Home Fires Caused by Electrical Distribution and Lighting Equipment (2015-2019 data), https://content.nfpa.org/-/media/Project/Storefront/Catalog/Files/Research/NFPA-Research/Electrical/osElectricalDistLighting.pdf
3. U.S. CPSC, New Technology for Preventing Residential Electrical Fires: AFCIs, https://www.cpsc.gov/s3fs-public/AFCIFireTechnology.pdf
4. NAHB, Arc-Fault Circuit Interrupters (code history), https://www.nahb.org/advocacy/top-priorities/building-codes/arc-fault-circuit-interrupters
5. New York Electrical Inspection Agency, AFCI Protection in Dwellings (2023 NEC), https://www.nyeia.com/wp-content/uploads/2025/10/2023-NEC_AFCI-Requirements.pdf
6. NEC 210.12(D) text, ElectricalLicenseRenewal.com (2020 NEC), https://www.electricallicenserenewal.com/Electrical-Continuing-Education-Courses/NEC-Content.php?sectionID=1344
7. California DGS, 2025 California Electrical Code erratum (adopts NEC 2023, effective Jan 1 2026), https://www.dgs.ca.gov/-/media/Divisions/BSC/02-Codes/Errta-01012026-Pt3-CEC-locked.pdf
8. U.S. CPSC, There’s a Chill in the Air (space heaters), https://www.cpsc.gov/Newsroom/News-Releases/2025/Theres-a-Chill-in-the-Air-Stay-Warm-Safely-Be-Cautious-When-Using-Generators-Furnaces-and-Space-Heaters
9. Electrical Contractor/EC&M, NEC Requirements for Branch Circuits (210.11(C)(1)), https://www.ecmweb.com/national-electrical-code/code-basics/article/55263898/nec-requirements-for-branch-circuits
10. NEC 400.12 text, ElectricalLicenseRenewal.com, https://www.electricallicenserenewal.com/Electrical-Continuing-Education-Courses/NEC-Content.php?sectionID=300
11. U.S. CPSC, Repairing Aluminum Wiring (Publication 516), https://www.cpsc.gov/s3fs-public/516.pdf
12. Hanover Insurance, Federal Pacific Electric Stab-Lok breakers and panelboards, https://www.hanover.com/businesses/business-customer-resources/hanover-risk-solutions/federal-pacific-electric-fpe-stab
13. NFPA, Smoke Alarms, https://www.nfpa.org/education-and-research/home-fire-safety/smoke-alarms

From the desk of Brea Electric – Orange County’s electrical contractor since 1932. Visit breaelectric.com or call (714) 529-3030.

Further Reading

• How to Change Hard-Wired Smoke Detectors
• When to Replace Old Electrical Wiring
• Preparing Home Electrical Systems for Extreme Weather