Power Lines and Network Communication

Mar 25, 2026 . 2 min read

network magnetic field emi electricity

Effects of Magnetic Fields from Power Lines on Network Communication

Paylas24 · 2 min read · May 17, 2025

Network cables used for communication between computers are often routed through the same channels as electrical lines. The magnetic field generated by electrical lines negatively affects network communication.

Therefore, it is important to separate (isolate) electrical lines from data (network) cables.

Technical Background

An electric current passing through a wire generates a magnetic field around it. The direction of the current determines the direction of the magnetic field. The strength of this field is called the magnetic moment. The intensity of the magnetic field varies depending on the thickness and length of the wire, as well as the strength of the electric current.

This force and the resulting field are calculated using the Lorentz Equation.

The Lorentz force, in physics, especially in electromagnetism, is the combination of electric and magnetic forces exerted on a point charge by electromagnetic fields.

Lorentz Force: Motion of an electron within a magnetic field

The fact that moving electric charges create magnetic fields was discovered in the early 19th century during an experiment when a compass needle near a current-carrying wire changed direction.

Potential Effects of Magnetic Fields from Power Lines on Network Communication

Electromagnetic Interference (EMI):
The varying magnetic field generated by power lines can induce currents in network cables. These induced currents interfere with the transmitted data signals, causing electromagnetic interference (EMI). This can compromise data integrity, cause errors, and reduce communication speed.
Signal Attenuation:
Strong magnetic fields can cause signals in network cables to degrade more quickly. This effect becomes more pronounced over long distances and can lead to signal loss before reaching the receiver.
Noise:
Induced currents from magnetic fields manifest as noise in network signals. This noise makes it difficult for the receiver to correctly interpret data and can cause communication interruptions.
Cable Damage (Rare):
In cases of extremely strong magnetic fields or prolonged exposure, there is potential for degradation of network cable insulation materials or corrosion of conductors, though this is less common.

Summary

Separate electrical lines from data (network) cables. Route them through different channels.
Always use data cables with good insulation (such as Cat6).

References

Written by Paylas24
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