Client
Stantec
Year
2024 - 2025
Location
Quebec

Context

In 2025, the City of Quebec planned to install a new public lighting and bike path network along Rue de la Faune, in an area crossed by several Hydro-Québec high-voltage (HV) lines. Given the proximity of this infrastructure, an electrical protection study was necessary to ensure the safety of citizens and workers, in accordance with Hydro-Québec’s technical guide (2019 edition).

3E Ing., commissioned by Stantec, conducted this study to assess the risks of electrical induction and step and touch voltages under the HV lines, and to propose corrective measures to ensure compliance with international standards IEC/TS 60479-1:2018, IEEE C95.1-2019, and ICNIRP 2010.

Objectives

  • Assess the step and touch voltages generated by high-voltage lines on new streetlights.
  • Verify that electric and magnetic fields comply with human exposure limits.
  • Identify the mitigation measures needed to reduce risks.
  • Propose sustainable technical solutions that ensure the safety of citizens and workers.

Methodology

The study used advanced simulation software XGSLab (XGSA_FD module), which enables 3D modeling of overhead conductors, soil, and grounding systems. The work included:

  • On-site soil resistivity measurements and seasonal modeling (summer/winter).
  • Modeling of high-voltage lines (315 kV, 735 kV, and 230 kV), counterweights, guard cables, and the grounding loop (MALT) of streetlights.
  • Simulations of electrical incidents to identify maximum induced voltages.

Recommended actions

  • Extension of the MALT loop to reduce voltage gradients.
  • Installation of 50 mm insulating asphalt paving around streetlights.
  • Addition of a MALT grid under the asphalt to equalize the ground potential.
  • Electrical separation of the grounding system via a 120/240 V isolation transformer.
  • Personal protective equipment (gloves, insulated boots, equipotential clothing) for workers in high-field areas.

Project impact

This study made it possible to:

  • Ensure regulatory compliance with Hydro-Québec and international standards.
  • Guarantee public safety under the high-voltage lines on Rue de la Faune.
  • Optimize the design of lighting infrastructure for real environmental conditions (frozen ground, humidity, terrain).

Conclusion

The intervention of 3E Eng. made it possible to identify, model, and correct the risks of electrical induction associated with installations under high-voltage lines. Thanks to a rigorous scientific approach and practical solutions, the project ensures a safe environment that complies with Hydro-Québec’s requirements and international standards.

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