On January 29, 2025, Innovation, Science and Economic Development Canada (ISED) published guideline 2025-DRS0001 related to human exposure to nerve stimulation (NS). The notice is intended to provide guidance for many inquiries regarding coil shapes that are exempt from NS testing. Wireless devices with coil shapes shown in the following three categories are exempt from the NS test after evaluation by standard calculations:

• planar shapes (Square, Rectangle, Hexagon, Elliptical, etc.);
• circular stacking (Stacked Rounded Rectangular, Stacked Rounded Cylinders, Cylindrical Coil, etc.);
• Surface mount technology (SMT) coil inductors.

Please note that 3-Axis SMT Coil and Double D Coil are not exempt from testing. In addition to the three types of coil shapes described above, ISED is not currently considering additional NS test exemption requests.

Click this link to view the original guide.