Wiktor Wise
The widespread use of electricity means that it is impossible to avoid exposure to the electric and magnetic fields produced in the transmission and distribution of electric power. Some researchers suspect that individuals with significant exposure to strong electromagnetic fields may be at increased risk of cancer, particularly childhood leukaemia. However, there is no established evidence that electric and magnetic fields at any distance from a high-voltage power line or substation/transformer cause health effects. This article will explore the topic of electricity transformers and any potential problems they pose to health.
| Characteristics | Values |
|---|---|
| Do electricity transformers cause health problems? | There is no established evidence that electricity transformers cause health problems. However, some studies suggest that living very close to a high-voltage power line (less than 50 meters) may slightly increase the risk of leukemia in children. |
| Radiation from electricity transformers | Electricity transformers emit non-ionizing ELF (extremely low-frequency) radiation, which does not have enough energy to cause ionization and is generally considered less harmful to humans. |
| Safe distance from electricity transformers | It is recommended to maintain a distance of more than 5-10 meters from electricity transformers, as the electric and magnetic fields at this distance are typically indistinguishable from normal background levels in a home. |
| Health effects of electromagnetic fields | Exposure to strong electromagnetic fields from various sources, including electricity transformers, has been a subject of concern. Some researchers suspect that significant exposure may be linked to an increased risk of cancer, but conclusive evidence is lacking. |
| Reducing exposure | To reduce exposure to electromagnetic fields from electricity transformers, one can increase the distance from the source, as the field strength decreases with distance. Rearranging room layouts and moving further away from electrical sources can also lower exposure levels. |
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What You'll Learn
Possible link to cancer
There is ongoing debate about the possible link between electricity transformers and cancer, with a range of studies and reports offering conflicting conclusions.
Some researchers argue that there is a potential connection between electromagnetic fields (EMFs) emitted by power lines and transformers and an increased risk of certain cancers, particularly leukemia and brain tumors. They suggest that long-term exposure to low-frequency EMFs may have a cumulative effect on the body, leading to
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Infertility
While electricity transformers can cause several issues for the homes or businesses they serve, there is no evidence to suggest that they cause infertility.
Electricity Transformers and Their Problems
Electricity transformers are the final point of voltage 'step down' before electricity reaches a home. They are connected to homes via four wires: two ground and neutral wires and two 'hot' wires or 'phases'. When normal operation is compromised, a distribution transformer can cause problems that manifest in different ways, from damaged electronics to fires inside or outside the home. Some of these issues include:
- 'Floating' voltage conditions: where the normal safe operating voltage falls below or climbs above recommended levels for an extended period.
- Extreme voltage changes: brownouts or surges that produce brief but extreme spikes far outside the normal safe operating voltage.
- Power surges: high electrical currents due to too much demand, upstream grid issues, or lightning strikes.
- Shorts: when two or more points that should not touch are bridged by weather, insects, or animals.
There is ongoing research on whether and how electromagnetic fields (EMFs) affect humans, specifically their potential impact on infertility and adverse pregnancy outcomes. However, the current evidence does not suggest a link between infertility and exposure to low-frequency magnetic fields.
A 2020 report from the European Commission's Joint Research Centre measured low-frequency magnetic fields in passengers from five electric vehicle (EV) models, and in no case did the maximum field exceed approximately 5 μT. The magnetic fields in EVs are comparable to those near household electronics, and there is no evidence linking EVs to infertility.
Similarly, a 2002 report by the California Department of Health linked EMFs to an increase in childhood leukaemia, adult brain cancer, Lou Gehrig's disease, and miscarriage. However, the consensus following this effort was that the evidence potentially linking exposure to magnetic fields and adverse reproductive health outcomes was inadequate.
To better understand the relationship between magnetic fields and infertility, future investigations should prospectively follow a cohort of women prior to conception through delivery, with exposure monitoring at key points. Such studies would minimise temporal ambiguity between exposure and outcomes, providing a clearer understanding of the potential risks associated with magnetic field exposure and adverse reproductive health.
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Childhood leukaemia
There is no established evidence that electric and magnetic fields at any distance from substations or transformers cause health effects. However, some studies have shown a potential link between exposure to magnetic fields from high-voltage power lines and an increased risk of childhood leukaemia.
Electricity is transferred from power plants via high-voltage lines to substations, where transformers reduce the voltage before electricity is transferred to medium-voltage power lines, and then to low-voltage power lines that bring electricity to our homes. All conductive parts of the electrical network produce electric and magnetic fields.
While there is no evidence of health effects from exposure to electric and magnetic fields at the levels near solar inverters, wireless devices, or computers, some population studies have reported that living very close to high-voltage power lines (less than 50 metres) may slightly increase the risk of leukaemia in children. However, the evidence is not strong enough to justify undue concern, and the findings of these studies are inconsistent.
Transformers and substations only create locally elevated magnetic fields, which show their effects within a small distance (typically less than 5 metres). However, the low or medium-voltage cables starting from the transformers can create elevated magnetic fields due to the large amount of current flowing through them.
One study evaluated the relationship between childhood leukaemia risk and exposure to magnetic fields from transformer stations in two Northern Italian provinces. The study found no overall association between residential proximity to transformer stations and childhood leukaemia, but there was some evidence of an elevated risk among children aged 5 years and above. Another multi-country study assessed the associations between residential proximity to transformers and the risk of childhood leukaemia, with exposure categorised as high, intermediate, or unexposed. The results showed a slightly higher relative risk for both intermediate and high exposure groups.
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Proximity to power lines
Several studies have investigated the exposure to electromagnetic fields (EMFs) and health. While earlier studies suggested associations between exposure and a variety of health effects, including brain cancer, breast cancer, cardiovascular disease, and reproductive and developmental disorders, most of these associations have not been substantiated by more recent research.
One of the first studies to link childhood leukemia with residential EMF exposure was published in 1979. Since then, several studies have found weak associations to support this original finding. A notable study found that children living in homes as far as 600 meters from power lines had an elevated risk of leukemia, with an increased risk of 69% for those living within 200 meters and 23% for those living within 200 to 600 meters. However, the underlying biological mechanism is unknown, making it difficult to determine the appropriate measure of EMF when evaluating health outcomes.
It is important to note that the evidence related to childhood leukemia is not strong enough to justify undue concern, but people should be aware of the issue to make informed decisions. Transformers and substations only create locally elevated magnetic fields, typically showing effects within a small distance of less than 5 meters.
While it is challenging to completely prove that low-level EMFs are risk-free, most scientists believe that exposure to low-level EMFs near power lines is generally safe.
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Wireless radiation
Wireless telecommunication devices and equipment, including cell phones, smart meters, and portable wireless devices, are common sources of radiofrequency radiation. These devices operate at frequencies ranging from 1.8 to 2.5 GHz, with some newer devices reaching frequencies of 5.8 GHz. Wireless local area networks, or Wi-Fi, are also a source of radiofrequency radiation, using radio waves to connect devices to the internet.
While wireless technology is prevalent in modern life, concerns have been raised about the potential health effects of exposure to wireless radiation. Some studies have suggested a possible link between wireless radiation and adverse health outcomes, particularly in children. For example, research has explored the relationship between residential proximity to transformer stations and childhood leukemia, finding some evidence of an elevated risk for children aged 5 years and older. However, it is important to note that the precision of these findings is limited by the small number of exposed children in the studies.
The International Commission on Non-Ionising Radiation Protection (ICNIRP) has established exposure guidelines for Extremely Low Frequency (ELF) electromagnetic fields (EMF), which include wireless radiation. These guidelines set limits to protect against potential health risks associated with exposure to ELF EMF.
Overall, the evidence regarding the health effects of wireless radiation is mixed. While some studies suggest a potential link between wireless radiation and certain health issues, other research, including studies on animals, has not confirmed these findings. The weight of evidence suggests that wireless radiation is not a significant health concern for the general population. However, further research is needed to definitively determine the effects of prolonged exposure to wireless radiation.
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Frequently asked questions
There is no established evidence that electricity transformers cause health problems. However, some studies have shown a possible elevated risk of childhood leukaemia among children aged 5 and above who live within 15 metres of a transformer station.
ELF stands for extremely low-frequency radiation. It is non-ionizing, meaning it does not have sufficient energy to produce ionization in the manner of high-frequency radiation. Most equipment used for the generation, transmission, and distribution of electric power in the United States generates ELF radiation.
There are no established symptoms of exposure to electricity transformers. However, some people have reported symptoms such as unexplained allergies, whistling in the ears, tachycardia, cardiac arrhythmias, fatigue, numbness of the head, and constant headaches.
The simplest way to reduce exposure to electricity transformers is to increase the distance between yourself and the transformer. Transformers only create locally elevated magnetic fields, which show their effects within a small distance (typically less than 5 metres).
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