Beatrice Lang
Utility pole fires are a common occurrence that can cause power outages and pose a serious risk of electrical injury. They are usually caused by the failure of insulators, switches, transformers, or oil-filled switching equipment, which can lead to a build-up of heat and result in a fire within the wooden pole. External factors such as vehicle accidents, fallen trees, and weather conditions can also contribute to pole fires. When responding to a pole fire, firefighters and police personnel must exercise caution by maintaining a safe distance from wires that may fall and ensuring effective crowd control.
| Characteristics | Values |
|---|---|
| Cause | Failure of insulators, switches, transformers, or oil-filled switching equipment |
| Moisture in the air combines with dust, dirt, salt, and grime on power lines or insulators, creating a path for electricity to reach the wooden pole | |
| Leaking transmission insulator | |
| Occurrence | Common in spring or during warmer spells in winter |
| Consequences | Power outages |
| Fire damage | |
| Need to replace or repair poles and lines |
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What You'll Learn
Fire caused by vehicle accidents or fallen trees
Electric poles can catch fire due to vehicle accidents or fallen trees. While wooden utility pole fires are uncommon, they can be caused by a combination of factors. For example, a vehicle collision with a utility pole may cause damage to oil-filled equipment, such as transformers, leading to a fire that is fuelled by leaking oil. Fallen trees can also cause electric pole fires, especially if they make contact with power lines. This can be exacerbated by dry conditions, where the insides of bolt holes in the pole may be dry enough to create an arc, resulting in a buildup of heat and potentially leading to a fire.
In the case of vehicle accidents involving electric poles, it is important to note that the poles may have dangerous levels of voltage present, especially if they have been treated with preservatives. When responding to such incidents, emergency services must take several precautions. First, the exact location of the pole should be reported to the nearest utility company, as they need to confirm that the conditions are safe before firefighters can extinguish the fire. Upon arrival, firefighters and police personnel should carefully assess the situation, being mindful of any wires that may burn off or fall due to the fire. Crowd control is crucial to ensure the safety of bystanders, and adjacent properties may need to be protected.
A non-conductive extinguishing agent is recommended for controlling the fire, as a direct stream of water should be avoided. Electric utility personnel will make the scene electrically safe, allowing firefighters to extinguish the fire using conventional methods if necessary. These incidents can lead to power outages, and the damaged poles or lines may need to be replaced or repaired.
Fallen trees contributing to electric pole fires can be influenced by external factors such as weather conditions. Prolonged dry periods, drought, and light precipitation (fog, misty rain, or light snow) can create an environment conducive to pole fires. Additionally, contaminants like dust, bird droppings, and road salts can accumulate on insulators, impacting their ability to divert electrical currents away from the poles.
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Insulator failure
Utility pole fires are often caused by insulator failure. Insulators are equipment installed at the tops of poles to keep electrical currents flowing away from the poles. When insulators fail, the current can flow to the pole through the metal hardware components of the insulator. This can cause the pole to catch fire, especially if the pole is highly conductive due to preservative treatment.
The presence of dry bands can also cause increased leakage current, leading to a flashover event and a power outage. The dry bands create a lower impedance part on the insulator surface, concentrating the electrical field in that area instead of dispersing it evenly across the surface. This electrical activity can eventually result in a pole fire.
Identifying and removing insulators with dry bands is crucial to preventing pole fires. Power washing insulators can help but may not always remove the dry bands effectively. Replacing affected insulators is often the most cost-effective solution to eliminating the risk of fire.
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Contaminants like salt, dust, bird droppings
Utility pole fires are dangerous and require careful handling by firefighters. While not very common, they can be caused by a variety of factors, including equipment contamination, insulator failure, and vehicle accidents.
Contaminants like salt, dust, and bird droppings can accumulate on insulators—equipment installed at the tops of poles to divert electrical currents away from the poles. This buildup, when combined with moisture in the air, can create a pathway for electricity to travel from the lines to the wooden pole, heating it up and potentially igniting a fire. This process is known as "tracking."
Drought and humid weather further contribute to the risk of pole fires, as the lack of rain allows the insulators to dry out, facilitating the movement of electricity and increasing the chances of a fire. Additionally, the preservatives used to treat the wood of some utility poles can make them highly conductive, causing them to burn rapidly and sustain the fire. These poles are typically identified by their distinct green color.
To prevent utility pole fires caused by contaminants, it is essential to regularly clean and maintain the insulators and equipment, especially in dry and humid conditions. Proper maintenance can reduce the likelihood of fire and ensure the safety of the surrounding area.
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Dry periods or drought
This phenomenon is more likely to occur after a prolonged dry period because the insides of bolt holes drilled into a pole may be dry enough to allow the creation of an arc, resulting in a buildup of heat inside the bolt holes and potentially leading to a fire.
Drought and dry weather also contribute to the risk of wildfires sparked by power lines. In hot and dry climates, if a power line falls or hangs low enough for vegetation to touch it, the surrounding dry vegetation can easily spark and ignite a wildfire. Overgrown trees and branches that reach power lines can also cause fires, as the branches can ignite and produce high-energy electrical arcs that can start fires on the ground.
The risk of wildfires caused by power lines is a significant concern, especially with the growing risk of wildfires due to climate change. Between 2016 and 2020, electrical power networks caused 19% of wildfires in that five-year period. Proper vegetation management, infrastructure maintenance, and proactive wildfire risk mitigation are crucial to prevent these types of fires.
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Lightning from storms
Lightning strikes can also cause direct damage to distribution line components such as poles, conductors, insulators, and transformers. The intense heat and mechanical stress generated by the strike can lead to conductor melting, pole splintering, insulator shattering, and transformer failure. This damage can result in power outages and require repair or replacement of the affected equipment.
The blast of electric energy from lightning can also cause dangerous power surges in power lines or buildings. When a lightning surge enters an unprotected residence via an electric power line, the voltages may be large enough to cause sparks in the house wiring or appliances. When such flashovers occur, they may short-circuit the alternating current power system, and the resulting power arc may start a fire.
Lightning is a powerful and dangerous force of nature that can cause significant damage to electrical infrastructure. It is important to take precautions to protect against lightning strikes and to have a plan in place for dealing with any resulting fires or power outages.
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Frequently asked questions
Electric poles can catch fire when electricity moves from the power line to the pole, often due to contaminated or failed equipment.
This can be caused by a combination of factors, including humid air, dirt, salt, and grime, which coat insulators and create a pathway for electricity to move from the line to the pole.
In rare cases, external conditions such as prolonged dry periods, drought, or light precipitation can create favourable conditions for pole fires.
Insulators are made of non-conductive material and are meant to separate the power line from the pole. When insulators fail or are contaminated, electricity can move from the line to the pole, causing a short circuit and generating heat, which can lead to a fire.
Pole fires can be disruptive, often causing power outages in entire neighbourhoods. They can also weaken poles or hardware, leading to structural failure and creating dangerous conditions.
