Umair Gaines
Electrical substations are an essential part of the power infrastructure, but there are concerns about the safety of living near one. Substations emit electric and magnetic fields (EMFs) and are usually protected by fences or located within buildings that only trained staff can access. While substations do not produce a significant external electric field, they do generate a magnetic field, which can be a concern for people living nearby. Some people worry about the potential health risks, such as cancer and leukaemia, associated with exposure to EMFs. However, studies on this topic have produced varying results, and it is important to consider other factors when evaluating the potential risks of living near a substation.
| Characteristics | Values |
|---|---|
| Safety concerns | EMFs emitted by substations |
| Risk of violent failure under certain conditions | |
| Electrocution risk | |
| No significant external electric field produced | |
| Magnetic field produced, but quickly decreases with distance | |
| No UK policy against mortgages on homes near substations | |
| Health concerns | Itchy skin and headaches |
| Possible increased risk of cancer | |
| Possible increased risk of leukaemia, especially for those under 18 | |
| Loud humming potentially causing lack of sleep |
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What You'll Learn
Substations emit electric and magnetic fields (EMFs)
The design of the equipment that substations contain means they don't produce a significant external electric field. Magnetic field levels at the boundary of a substation are typically at a level of 1 or 2 µT, but this decreases very quickly as you move away. At approximately 1-2 metres from the substation, the magnetic field is usually lower than the field found in your home.
Background EMFs are present in most homes, and you are exposed to more EMF using common household appliances than living near (within 50 feet) of a transmission line or substation. It has been thoroughly studied and found to have, at best, a highly dubious correlation with negative health effects.
However, a population-based case-control study of leukaemia and residential proximity to electricity supply equipment has been carried out in south-east England. The relative risk of leukaemia from residence within 50 m of a substation was higher than in adults, with a relative risk of 2.0. For persons aged less than 18, the relative risk of leukaemia from residence within 50 m of a substation was 1.5.
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There is a potential risk of cancer
There is some evidence to suggest that living near an electrical substation could increase the risk of certain cancers. A case-control study of leukaemia and residential proximity to electricity supply equipment was carried out in south-east England. The study found that the relative risk of leukaemia for those living within 25 metres of a substation was 1.3 (95% CI 0.8-2.0). For those under 18, the relative risk of leukaemia from residence within 50 metres of a substation was even higher, at 1.5 (95% CI 0.7-3.4).
Another study looked at the potential link between residence near electricity transmission equipment and cancer. This study found that the relative risk of cancer for those living within 100 metres of an overhead power line was 1.45 (95% CI 0.54-3.88), and within 50 metres, the relative risk increased to 2.0 (95% CI 0.4-9.0).
It is important to note that these studies do not definitively prove a causal link between living near electrical substations and an increased risk of cancer. However, they do suggest that there may be a potential risk that warrants further investigation.
While these studies suggest a potential risk of cancer, it is important to consider other factors that could impact health when living near an electrical substation. For example, the loud humming of electrical equipment could cause a lack of sleep, which can have negative health effects. Additionally, in the event of a short circuit, if protective equipment fails to interrupt the circuit, a power transformer in a substation can fail violently, causing a massive fire and releasing stray electrical currents and flying hot debris. While this is an unlikely event, it is a potential short-term health risk for those living nearby.
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Substation equipment could fail violently
Secondly, communication failures can impact a substation's ability to monitor and control its equipment. If a communication failure prevents the detection of equipment faults, it may lead to power outages or further equipment damage. Additionally, substations are vulnerable to cybersecurity threats, as hackers may infiltrate control systems, leading to equipment failure or outages.
Thirdly, switchgear failure can result in fire, explosion, and electric shock. Oil circuit breakers and fuse switches have caused many serious accidents, and some have resulted in fatalities. These accidents are often caused by mechanical problems with auxiliary equipment or the failure of routine and emergency operating procedures.
Finally, cable tunnels are vulnerable to external fires, and under-floor ducts are susceptible to flooding and the entry of rubbish, flammable liquids, and vapours. Therefore, cable tunnels should be equipped with fire detection and monitoring equipment and possibly fixed fire extinguishing installations.
While substation equipment failures can occur, it is important to note that these events are rare and that substations are designed with safety in mind. They are usually protected by fences or located within secure buildings accessible only to trained staff.
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There are no UK policy restrictions on mortgages for homes near substations
There are no UK policy restrictions on mortgages for homes near electrical substations. However, there are concerns about the safety of living close to one. Substations emit electric and magnetic fields (EMFs), which are linked to potential health risks. These include itchy skin, headaches, and an increased risk of cancer.
EMFs are produced by voltage and current flowing through a conductor, and while substations emit them, the fields decrease rapidly with distance from the source. At 1-2 metres from a substation, the magnetic field is typically lower than that found in a home. The UK guideline limits for public exposure are 360 µT for power frequency (50 Hz) magnetic fields, and the fields within homes near substations are a small fraction of these limits.
While there are no specific mortgage restrictions, it is still a significant factor to consider when buying a home. You can contact power authorities to enquire about EMF strength and levels, and request substation safety guidelines. It is also recommended to look up past substation survey reports to assess any potential risks.
In summary, while there are no UK policy restrictions on mortgages for homes near substations, it is important to be aware of the potential health risks associated with EMF exposure and take the necessary precautions to ensure the safety of you and your family.
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A substation is unlikely to produce a significant external electric field
There are concerns about the safety of living close to an electrical substation, primarily due to the emission of electric and magnetic fields (EMFs). However, it is important to understand that a substation is unlikely to produce a significant external electric field.
Electric fields are produced by voltage, while magnetic fields are generated by the current flowing through a conductor. The electric fields produced by the equipment in a substation tend to remain constant due to the fixed operating voltage. On the other hand, magnetic field strength can fluctuate as the current varies based on the electricity demand in the area.
The design of the equipment in substations prevents the production of a substantial external electric field. While they do generate magnetic fields, these fields rapidly decrease as you move away from the substation. At the boundary of a substation, magnetic field levels typically measure 1 or 2 µT, but at a distance of 1-2 meters, the magnetic field is usually lower than what is found in a typical home.
It is worth noting that background EMFs are present in most homes due to common household appliances. The magnetic fields within homes, even those located directly next to substations, are only a small fraction of the ICNIRP limit for public exposure, which is set at 360 µT for power frequency (50 Hz) magnetic fields.
While the risk of long-term health issues due to living near a substation is generally low under normal operating conditions, there is a chance of short-term health risks in rare cases of multiple protection system failures. Additionally, the loud humming noise from substations can potentially cause sleep disturbances.
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Frequently asked questions
While electricity substations are an important part of our power infrastructure, there are concerns about the safety of living close to one. Substations emit electric and magnetic fields (EMFs), and while these are typically at a level of 1 or 2 µT at the boundary of a substation, they decrease rapidly as you move away. The UK guideline limits for public exposure are set at 360 µT, and magnetic fields within your home will be a small fraction of these exposure limits even if you live next to a substation. While there is some research that suggests a link between living near substations and certain health risks, the evidence is not conclusive.
Some people have reported symptoms such as itchy skin, headaches, and lack of sleep due to loud humming when living close to a substation. There is also research that suggests a potential link between living near electricity substations and an increased risk of certain types of cancer, such as leukaemia. However, the evidence is mixed, and other factors are likely to be more influential.
Larger substations are usually located outside urban areas and can span across acres, containing a significant amount of specialist electrical equipment. Smaller substations, on the other hand, are typically owned and maintained by local distribution networks and supply electricity at mains voltage to homes.
While there is no UK policy against mortgages on homes near substations, it is still something to consider when buying a property. Surveys will often report the presence of substations, and you can contact the EMF helpline or refer to resources provided by organisations like SMUD for more information on specific substations.
Under no circumstances should you try to enter a substation or interact with any equipment, as it can pose a risk of electrocution and even death. Substations are usually protected by fences or located within secure buildings, and only trained staff should access them.
