There must be a minimum HORIZONTAL distance of 3 m between any part of a building and the closest medium-voltage line. Example: Adding a storey to a building near a distribution lineIt is difficult to predict a safe distance from power lines, because the EMFs can vary greatly depending upon the situation. (Special note: magnetic. Disclaimer: This calculator provides estimates based on standard models and scientific literature. Actual EMF levels vary with power load, weather conditions, and line configuration. For precise measurements, consult qualified EMF professionals. High-voltage power lines are one of the most powerful. Building near power lines involves more than just safety — setback rules, OSHA requirements, and local codes all affect what you can build and where. Most buildings need to stay at least 7 to 10 feet horizontally from overhead power lines, though that number climbs significantly for higher-voltage. • The CNESST could halt your work if it is being performed within three metres of a power line and if the jobsite is not considered safe. • Hydro-Québec could have to move the power line—at your expense. •. The minimum safe distance from a power line depends on the voltage, the type of activity, and what's nearby, but the most widely recognized baseline is 10 feet for any person or piece of equipment near lines carrying up to 50,000 volts. That figure comes from federal workplace safety regulations.
