Molly Ayala
Power surges are unexpected, temporary increases in the current or voltage of electricity. They can be extremely disruptive, causing damage to electrical systems and appliances. Power surges can originate from both inside and outside a facility, with lightning strikes being the most recognisable external source. Surges can also be caused by switching surges, which occur during the switching on and off of certain electrical loads. These switching surges are more frequent than larger externally generated surges, but they can be disruptive and damaging to equipment over time.
| Characteristics | Values |
|---|---|
| Definition | A transient wave of current, voltage, or power in an electric circuit |
| Other names | Transients, power surges |
| Typical duration | Less than half a cycle of the normal voltage waveform, often lasting only a few microseconds |
| Typical voltage | Can reach amplitudes of tens of thousands of volts |
| Typical current | Can reach 3000 Amps |
| Polarity | Can be positive or negative |
| Nature | Can be additive or subtractive to the normal voltage waveform |
| Behaviour over time | Often oscillatory and decaying |
| Sources | Internal (e.g. switching surges, equipment faults, capacitor bank building, load switching) or external (e.g. lightning, tree branches touching power lines, animals getting into transformers) |
| Impact | Can damage, degrade, or destroy electronic equipment |
| Preventative measures | Surge protectors, whole-house surge protection, power strip surge protectors |
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What You'll Learn
Power surges can cause electrical fires and damage appliances
Power surges are transient waves of electrical current, voltage, or power in an electric circuit. They can occur due to internal or external sources, with an estimated 60 to 80% of power surges originating from inside the house. Internal sources include faulty wiring, electrical overloads, and switching surges caused by the operation of certain electrical loads. Faulty wiring, which is often challenging to identify, can lead to power surges and increase the risk of electrical fires. Signs of faulty wiring include burn marks on outlets, a burning smell from wiring or outlets, buzzing sounds from outlets, and frequently tripping circuit breakers.
External sources of power surges include lightning strikes, which can induce electrical surges onto power or communication systems, and utility-initiated grid and capacitor bank switching. Lightning strikes can cause a significant power surge by producing a large voltage that the electrical system must accept, leading to a substantial spike in voltage. While lightning strikes are less frequent, they can result in catastrophic damage to electrical systems and connected loads.
To mitigate the risks associated with power surges, it is recommended to use surge protectors for sensitive electronics and appliances. While surge protectors do not entirely prevent power surges, they redirect the excess voltage into the ground, safeguarding connected devices. Point-of-use surge protection devices (SPDs) and service entrance surge protectors are effective measures to protect specific appliances and the entire electrical system, respectively. Additionally, during severe storms or when lightning is expected, it is advisable to unplug devices that do not have surge protection to minimize the potential for fire and appliance damage.
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Surge protectors can prevent damage to devices and appliances
A power surge is a transient wave of voltage, current, or power in an electrical circuit. It is an abnormally high voltage lasting for a short period of time, usually a few microseconds. Power surges can be caused by various factors, including lightning strikes, power outages, electrical malfunctions, faulty wiring, electrical grid malfunctions, and the on/off cycling of large appliances. These surges can damage or destroy electronic equipment within homes, commercial buildings, or industrial facilities.
Surge protectors are devices designed to shield electronic devices and appliances from sudden power surges. They work by redirecting excess voltage safely to the ground, preventing it from reaching and damaging your devices. Surge protectors act as a defense system for your electronics, protecting them from voltage spikes that can occur due to lightning, power outages, or electrical malfunctions. They are especially important in areas prone to lightning storms, such as Florida, where power fluctuations can easily damage sensitive electronics.
While surge protectors offer valuable protection, they have their limitations. They cannot keep your devices running during a blackout and may not withstand a direct lightning strike. Additionally, surge protectors degrade over time and need to be replaced every 3-5 years, especially in high-use areas. It is also important to ensure that your surge protector is properly grounded to provide an effective path for diverting excess voltage away from your appliances.
To identify a reliable surge protector, look for the word "joules" on the packaging or the device itself. This indicates that it is designed to handle and divert excess voltage. When choosing a surge protector, consider factors such as price, style, telephone line protection, and voltage-handling capacity. It is recommended to select a surge protector that has been tested and listed by a reputable organization, such as UL 1449, to ensure it meets the stringent requirements for transient voltage surge suppressors.
By investing in a good quality surge protector, you can have peace of mind knowing that your electronic devices and appliances are safeguarded from potential damage caused by power surges.
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Surges can be internal or external
A power surge is a transient wave of abnormally high voltage, current, or power in an electrical circuit. Power surges can occur in three main ways: when there is an interruption in the flow of electricity followed by a short; when an increased delivery of power is interrupted when electricity is sent flowing back into the system; or when a sudden increase of voltage is sent through a power system from internal or external forces.
Internal Power Surges
Internal power surges are the most common type of power surge and occur dozens of times a day. They happen when devices with motors start up or shut off, diverting electricity to and from other appliances. Refrigerators and air conditioners are the biggest culprits, but smaller devices like hair dryers and power tools can also cause problems. Internal power surges can also be caused by faulty wiring, which is more likely to occur with damaged or exposed electrical wires. Outlets with burn marks, a burning smell coming from wiring or outlets, a buzzing sound coming from outlets, and circuit breakers frequently tripping are all signs of faulty wiring.
Internal power surges can be prevented by ensuring that devices are not overloading circuits. Large appliances should not share the same socket with other appliances, and wiring should be up to code. Point-of-use surge protectors can also be used to defend against internal power surges by absorbing excess power before it reaches appliances.
External Power Surges
External power surges are less common but can be more damaging to electronics. They are most often caused by lightning strikes, but can also be caused by a tree limb touching a power line, a small animal getting into a transformer, or the restoration of power after an outage. External power surges can also come into a home through telephone and cable TV lines.
External power surges can be prevented by using surge protectors, which divert the excess voltage to the ground. These can be integrated into the power supply design or used at the power socket with a surge-protected plug or extension power strip.
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Lightning is a common cause of power surges
A power surge is an abnormally high voltage lasting for a short period of time. It is a transient wave of voltage, current, or power in an electrical circuit. Power surges can be caused by electrical overload, faulty wiring, lightning strikes, and the restoration of power after a power outage or blackout.
While lightning damage is rare, it is still a serious threat to electronics in homes and businesses. Lightning strikes can cause voltage spikes and power surges that can damage or destroy electronic equipment. Even if the equipment is not completely ruined, a power surge can shorten its lifespan, clear stored data, or cause other harm. Surge protectors can help safeguard consumer electronics from high-voltage surges, but they do not always provide complete protection.
There are two main ways that lightning can cause power surges: direct and indirect. Direct lightning strikes occur when lightning directly hits a facility's electrical system. This can cause immediate and severe damage to the electrical system and connected loads. Indirect lightning strikes occur when lightning strikes nearby power lines or structures, inducing electrical surges onto the power or communication systems. These indirect strikes can still cause voltage spikes and power surges that can damage connected equipment.
In summary, lightning is a common cause of power surges that can have significant impacts on electrical systems and connected equipment. Power surges from lightning can occur through direct or indirect strikes, and the resulting voltage spikes and power surges can cause damage and disruption.
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Faulty wiring can cause power surges
A power surge is a transient wave of voltage, current, or power in an electrical circuit. It is an abnormally high voltage lasting for a short period of time. Power surges are common and can happen multiple times a day. They can be caused by external sources, such as lightning strikes, or internal sources, such as faulty wiring.
Faulty wiring is a potential internal cause of power surges. Frayed or exposed electrical wires are more likely to experience power surges due to faulty wiring. Old homes with outdated electrical systems may also have faulty wiring, as they may not be equipped to handle modern electrical needs. Signs of faulty wiring include blowing fuses, frequently tripping circuit breakers, flickering lights, and a burning smell coming from wiring or outlets. If you suspect faulty wiring, it is best to contact a certified electrician to diagnose and fix the issue.
Faulty wiring can lead to electrical overloads, which is a common cause of power surges. Electrical overloads occur when too much power is drawn from a single circuit, such as when multiple appliances are plugged into a single outlet or extension cord. This can cause a massive current and subsequent voltage spike, leading to a power surge.
To protect against power surges caused by faulty wiring, homeowners can invest in a surge protector. A surge protector provides internal protection against external and internal surges and ensures a consistent electric flow. While surge protectors are not necessary for the functionality of electronic devices, they can prevent damage caused by power surges and extend the lifespan of devices. It is important to note that only an expert electrician should install a surge protector to ensure it is done correctly.
In summary, faulty wiring can cause power surges by leading to electrical overloads and voltage spikes. To prevent power surges and potential electrical fires, it is important to be aware of the signs of faulty wiring and take preventative measures, such as hiring an electrician to install a surge protector.
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Frequently asked questions
A power surge is an unexpected, temporary increase in the current or voltage of electricity in an electrical circuit.
Power surges can be caused by internal or external factors. Internal surges are usually caused by faulty wiring or the start-up and shut-off of inductive loads like motors. External surges are often the result of lightning or tree branches coming into contact with power lines.
A power surge can damage electrical appliances and electronic devices by causing voltage spikes that exceed the normal operating range. This can lead to electrical arcs and heat damage, potentially destroying wiring and other components.
To protect against power surges, you can invest in power strip surge protectors or whole-house surge protection. Surge protectors divert the excess voltage to the ground, preventing it from reaching your devices.
