Can strong and weak electricity interfere with signals when placed together?

Placing high-voltage and low-voltage wiring together can indeed cause signal interference, primarily due to the electromagnetic fields generated by high-voltage lines affecting the quality of low-voltage signals.

Interference Mechanism and Impact Intensity

The formation of electromagnetic interference (EMI).
The AC power transmitted through high-voltage lines generates harmonics and time-varying electromagnetic fields. When these fields run parallel to or are placed in close proximity with low-voltage lines, they can induce coupling into the low-voltage circuits via electromagnetic induction, leading to signal distortion, data packet loss, and other related issues.

Specific interference manifestations.

Deteriorating communication quality: Increased noise on phone lines, network latency, or frequent disconnections;

Equipment malfunction: Noise on the monitoring screen, and smart home controls failing to respond;

Safety hazard: Insulation damage could allow high-voltage electricity to leak into low-voltage equipment, potentially causing fires or electric shock incidents.

Key factors determining the level of interference.

Distance and Parallel Length: When the spacing is less than 30 cm and the parallel length exceeds 50 cm, interference is significantly enhanced.

Load characteristics: Transient disturbances caused by the instantaneous start-up and shutdown of high-power equipment such as motors and variable-frequency drives are more severe.

Shielding measures: Unshielded lines can experience interference levels more than 10 times stronger than those of shielded lines.