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INFORMATION ON ELECTRIC AND MAGNETIC FIELDS Willoughby to North Chatswood 33kV underground cabling work About the work EMF experienced in everyday life As part of Sydney Metro Northwest, NRT is required to install a new power supply for the operation of the project from Ausgrid’s Willoughby Subtransmission Substation to Transport for NSW’s North Chatswood traction substation. What are electric and magnetic fields? Electric and magnetic fields (EMF) are found wherever electricity is present, including home and office appliances, sub-stations and electrical cables. All electrical equipment creates electrical and magnetic fields. The electric field is associated with the voltage of the equipment and the magnetic field is associated with the current. In combination, these fields cause energy to be transferred along electric wires. With both electric and magnetic fields, the strength of the field is strongest when close to its source and diminishes rapidly with distance from the source. Many common materials, such as brickwork or metal also block electric fields so they are readily shielded. In relation to this project, the electric fields associated with the underground cables are fully shielded by the cables themselves. As magnetic fields are related to the current rather than the voltage, high voltage equipment is not the only source of magnetic fields encountered in everyday life. Modern life involves frequent contact with magnetic fields from a variety of sources such as appliances in the home and workplace and electrical machinery. The strength of a magnetic field depends on the size of the current and decreases with distance from the source. Do electrical sources cause health effects? As we are surrounded by electrical sources in our daily lives, we are constantly exposed to some level of EMF. The possibility of adverse health effects due to the EMF associated with electrical equipment has been comprehensively studied over several decades worldwide. To date the scientific evidence does not establish that exposure to EMF found around the home, office or near power lines causes health effects. What are international and Australian guidelines/standards? The current International Commission on Non-Ionising Radiation Protection guideline (ICNIRP, 2010) regarding magnetic field exposure limits for the general public is 2,000 milligauss (mG). The Australian Radiation Protection and Nuclear Safety Agency (ARPANSA) in December 2006 issued a Draft Standard on Exposure Limits for Electric and Magnetic Fields which proposed a magnetic field exposure limit (Reference Level) for the general public of 1,000mG. In July 2007, the Australian Government Radiation Health Committee revised the magnetic field limit for the general public upwards to 3,000mG. In general, EMF from electricity assets will be well below the Reference Levels in these guidelines, however, the practice of “prudent avoidance” has been adopted by the Australian Energy Networks Association (ENA), of which the Asset Standards Authority of Transport for NSW is a member. Prudent avoidance does not mean there is an established risk that needs to be avoided. It means that if there is uncertainty, there are measures that could be implemented to reduce the intensity of the fields generated. What is the electric field for the 33kV underground cables? As the 33kV line is made up of triple core cables encased in a plastic conduit and installed underground, it will not produce any external electric fields. What is the magnetic field for the 33kV underground cables? Based on a project-specific assessment available on the Sydney Metro website, the magnetic field contribution would be approximately 1-2mG at the source (similar to an electric fan and less than 0.05 percent of the ICNIRP reference level) and back to background levels at any property boundaries. These levels are at the very low end of the range normally encountered in everyday life. For example, household items like electric fans and TV sets have a measurement range up to 2mG, while electric blankets and hair dryers have much higher measurements of 530mG and 10-70mG respectively. Transport for NSW has made information regarding EMF publicly available through the Review of Environmental Factors completed in 2015. How is Sydney Metro Northwest managing and minimising EMF? Guided by the prudent avoidance principles, Sydney Metro Northwest is: - placing the cables underground rather than installing less expensive overhead lines - burying the cables 1-2 metres beneath the road carriageway away from residential property boundaries so that the magnetic field contribution at and beyond them will be lower - using 3-core cables, which greatly cancel out the strength of the magnetic fields. Where can I find more information? ARPANSA EMF Fact sheets www.arpansa.gov.au Ausgrid Electric and Magnetic Fields (EMF) http://www.ausgrid.com.au/Common/CustomerServices/In-your-neighbourhood/Electric-andmagnetic-fields.aspx#.WQf6QPmGPIU ENA Electric and Magnetic Fields www.energynetworks.com.au/electric-andmagnetic-fields ICNIRP www.icnirp.org Sydney Metro Northwest Willoughby to North Chatswood 33kV underground feeder power line Review of Environmental Factors (REF) https://www.sydneymetro.info/station/willoughby -north-chatswood WHO EMF Fact sheets www.who.int For more information, to register for email updates or to make a complaint phone 1800 019 989 (operating 24 hours a day, 7 days a week), email us at [email protected], or visit www.sydneymetro.info.