Molly Ayala
An arc, or arc discharge, is an electrical breakdown of a gas that produces a prolonged electrical discharge. This can result in a very high temperature, capable of melting or vaporizing most materials. An arc fault occurs when loose connections or faulty wiring cause sparking or arcing, which can lead to electrical fires. Arc Fault Circuit Interrupters (AFCIs) are devices that can be installed within your electrical panel to detect a wide range of arcing electrical faults and help reduce the risk of electrical fires. AFCIs are designed to meet one of two standards: branch type or combination type. This article will explore the dangers of electrical arcs, the protection offered by AFCIs, and the different types available.
| Characteristics | Values |
|---|---|
| Definition | An electric arc is the form of electric discharge with the highest current density. |
| Occurrence | An electric arc occurs when electrons flow between two conductors, usually metal, in an environment with a gas or vacuum. |
| Cause | An arc fault occurs when loose, faulty, or corroded wiring connections create an intermittent contact that causes an electrical current to spark or arc between metal contact points. |
| Hazards | Arc flashes can cause third-degree burns, cardiac arrest, hearing loss, blindness, nerve damage, and even death. |
| Temperature | Temperatures of electric arcs can exceed 10,000°F (5,537°C), which is well above the melting point of wire insulation. |
| Protection | Arc Fault Circuit Interrupters (AFCIs) are devices designed to detect a wide range of arcing electrical faults and break the circuit to prevent electrical fires. |
| Installation | AFCIs can be installed within an electrical panel instead of a standard circuit breaker. |
| Cost | AFCIs typically cost $30-$40 each, while a normal circuit breaker costs $2-$5. |
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What You'll Learn
Arc-fault circuit interrupters (AFCIs)
An electric arc is the form of electric discharge with the highest current density. It is an electrical breakdown of a gas that produces a prolonged electrical discharge. The current through a normally non-conductive medium such as air produces a plasma, which may produce visible light. The various shapes of electric arcs are emergent properties of non-linear patterns of current and electric field. The arc occurs in the gas-filled space between two conductive electrodes and results in a very high temperature, capable of melting or vaporizing most materials.
AFCIs function by monitoring the electrical waveform and promptly opening (interrupting) the circuit they serve if they detect changes in the wave pattern that are characteristic of a dangerous arc. They can also distinguish between safe, normal arcs, such as those created when a switch is turned on or a plug is pulled from a receptacle, and arcs that can cause fires. The electronics inside an AFCI breaker detect electrical current alternating at characteristic frequencies, usually around 100 kHz, known to be associated with wire arcing, which are sustained for more than a few milliseconds.
AFCI circuit breakers are designed to meet one of two standards as specified by UL 1699: "branch" type or "combination" type. A branch type AFCI trips on 75 amperes of arcing current from the line wire to either the neutral or ground wire. A combination type adds series arcing detection to branch type performance. AFCIs can be used in conjunction with GFCI protection to provide both arcing fault protection as well as 5mA ground fault protection.
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AFCI breakers
An arc-fault circuit interrupter (AFCI) or arc-fault detection device (AFDD) is a type of circuit breaker that detects and breaks the circuit when it identifies electrical arcs that are indicative of loose connections in wiring. Loose connections can become hot enough to ignite house fires. AFCI breakers have been required in the US and Canada since the late 1990s/early 2000s, initially for circuits feeding electrical outlets in residential bedrooms, and later for most residential outlets.
AFCIs can be used in conjunction with GFCI (Ground Fault Circuit Interrupter) protection to provide both arcing fault protection and ground fault protection. While a standard circuit breaker detects overloads and short circuits, an AFCI uses advanced electronic technology to “sense” different arcing conditions and distinguish between a harmless arc and a potentially dangerous arc. AFCIs can be significantly more expensive than standard circuit breakers, costing $30-$40 each compared to $2-$5 for a normal circuit breaker.
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AFCI receptacles
An arc fault is the electrical breakdown of a gas that produces a prolonged electrical discharge. Arcing creates high-intensity heat, which may exceed 10,000 degrees Fahrenheit, resulting in burning particles that may, over time, ignite surrounding materials such as wood framing or insulation.
An arc fault circuit interrupter (AFCI) is a circuit breaker that breaks the circuit when it detects the electric arcs that are a signature of loose connections in home wiring. Loose connections, which can develop over time, can sometimes become hot enough to ignite house fires. An AFCI selectively distinguishes between a harmless arc (incidental to the normal operation of switches, plugs, and brushed motors) and a potentially dangerous arc (that can occur, for example, in a lamp cord with a broken conductor).
AFCI outlets are designed to recognize many types of potentially hazardous arc faults and respond by interrupting power, reducing the likelihood of the home's electrical system being an ignition source of a fire. Often unseen, arc faults can occur anywhere in the home's electrical system, including within walls, at loose electrical connections, or within electrical cords accidentally damaged by furniture.
Since 1999 in the United States and 2002 in Canada, national codes have required AFCIs in all circuits that feed outlets in bedrooms of dwelling units. As of 2014, AFCI protection is required on all branch circuits supplying outlets or devices installed in dwelling unit kitchens, along with dwelling unit family rooms, dining rooms, living rooms, parlors, libraries, dens, sunrooms, recreation rooms, closets, hallways, and laundry areas.
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Arcing conditions
Arcing is a type of electrical discharge that occurs when electrons flow between two conductors, usually metal, in an environment with a gas or vacuum. The conductors can be wires, rods, or other objects that are capable of carrying an electrical current. When the electrical potential difference between the two conductors is high enough, the electrons will flow from one conductor to the other, causing a spark or arc.
In the context of electrical panels, arcing can occur when circuits become overloaded and overheated. This can cause damage to the circuit breaker and its connection to the bus, which can lead to a malfunction where the circuit breaker continues to allow electricity to flow instead of tripping.
There are several indicators of potential arcing in an electrical panel:
- Fuses that blow frequently or circuit breakers that trip often
- Burn marks or a burning smell near the panel
- Buzzing or cracking sounds
- Sparks when plugging in a device
- Appliances not running as they used to
- Electrical panel is hot to the touch
If any of these signs are present, it is important to contact a qualified electrician to inspect for potential electrical hazards. Arcing can cause fires or damage to electrical equipment, so it is crucial to address these issues promptly.
To prevent arcing in electrical panels, it is recommended to:
- Ensure the panel can handle the workload of powering all appliances
- Keep conductive and flammable materials away from outlets
- Avoid running too many devices and appliances simultaneously
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Electrical fires
An arc fault is an unintentional electrical discharge within a circuit. They are caused by loose, damaged, or corroded wires and terminals. The low-voltage currents can’t be detected by standard circuit breakers or residual current devices. Over time, they generate enough heat to break down the wiring insulation and ignite any surrounding flammable material. Electrical failures, including arc faults, account for 25% of building fires.
An electric arc is the form of electric discharge with the highest current density. The maximum current through an arc is limited only by the external circuit, not by the arc itself. An arc between two electrodes can be initiated by ionization and glow discharge, when the current through the electrodes is increased. The breakdown voltage of the electrode gap is a combined function of the pressure, distance between electrodes, and type of gas surrounding the electrodes. When an arc starts, its terminal voltage is much lower than a glow discharge, and the current is higher. An arc in gases near atmospheric pressure is characterized by visible light emission, high current density, and high temperature.
An arc fault circuit interrupter (AFCI) or arc-fault detection device (AFDD) is a type of circuit breaker that can be installed within an electrical panel to detect and prevent arc faults. AFCIs detect electrical current alternating at characteristic frequencies, usually around 100 kHz, which are known to be associated with wire arcing. When dangerous arcing is detected, the AFCI opens the circuit. AFCIs are more expensive than standard circuit breakers, typically costing $30-$40 each, and there is some debate about their effectiveness as arcing can still occur when they are installed. However, they significantly reduce the risk of arc faults and are particularly useful in residential and commercial environments with sleeping accommodations, flammable or combustible materials, or irreplaceable goods.
To prevent electrical fires caused by arc faults, it is important to regularly inspect and maintain electrical wiring and appliances. Old appliances, faulty outlets, and frayed electrical cords are common causes of electrical fires and should be replaced or repaired as soon as possible. Additionally, automatic fire suppression systems can be installed inside electrical panels to provide 24/7 fire protection. These systems use pressurized tubing that will burst and release a clean agent into the cabinet when exposed to flames, effectively suppressing the fire and limiting equipment damage.
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Frequently asked questions
ARC, or electric arc, refers to the electrical breakdown of a gas that produces a prolonged electrical discharge. This can be caused by loose or corroded wiring connections, which create intermittent contact and cause an electrical current to spark or arc between metal contact points.
Arcing occurs when electrons flow between two conductors, usually metal, in an environment with a gas or vacuum. The conductors can be wires, rods, or other objects capable of carrying an electrical current.
Arcing can lead to electrical fires, as the heat from the arc can break down the insulation surrounding individual wires, providing the trigger for a fire. Arcing can also cause injuries such as third-degree burns, cardiac arrest, hearing loss, blindness, nerve damage, and even death.
Arc Fault Circuit Interrupters (AFCIs) are devices that can be installed within your electrical panel to detect and prevent arcing. They use advanced electronic technology to monitor the circuit for "normal" and "dangerous" arcing conditions and break the circuit if dangerous arcing is detected.
