The measurement of the height of a 150 kV SUTT cable with electromagnetic effects using a laser controlled by a stepper motor with the tangential trigonometry method has been conducted. The SUTT cable serves to transmit electricity at high voltage, and the impact of its electromagnetic radiation can affect the health and well-being of the surrounding population. This research aims to determine a safe distance from the transmission cable in accordance with the permitted threshold. Measurements were directly taken on the SUTT cable of PT PLN P3B Sumatera UPT Medan using a laser controlled by a stepper motor. The stepper motor is manipulated by the ATmega32 microcontroller to form a specific angle. The tangential trigonometry method is employed to calculate the cable height based on the angle formed by the laser. The measurement results are compared with the established threshold standards to ensure the safety of the surrounding environment. The impact of electromagnetic radiation, especially related to magnetic fields, is evaluated to understand potential long-term health risks. This study demonstrates that measuring the height of the SUTT cable using a laser and the tangential trigonometry method can provide accurate results. The calculated height results are compared with threshold standards to ensure compliance with safety regulations.