Electrical noise is any unwanted electrical or electronic disturbance that interferes with the normal operation or signal integrity of conductors, circuits, or electrical and electronic equipment.
Electrical noise is a broad term used to describe disturbances that introduce unintended signals into electrical systems. These disturbances can originate from both external and internal sources and may affect power, control, communication, and signal carrying conductors. In commercial and industrial environments, electrical noise is a common consideration due to the density of equipment, varying load conditions, and the coexistence of power and low voltage systems.
Noise can be generated by many types of equipment, including motors, variable frequency drives, switching power supplies, lighting systems, and high current devices. These sources can create rapid changes in voltage or current that propagate through conductors and nearby electrical pathways. Electrical noise can also be introduced through electromagnetic coupling, ground potential differences, or switching events within a system.
The impact of electrical noise depends on the sensitivity of the affected equipment. Some systems tolerate a high level of background disturbance without noticeable effects, while others rely on clean and stable electrical environments to function correctly. In signal dependent applications, electrical noise may manifest as data errors, degraded signal quality, timing irregularities, or unpredictable system behavior.
Electrical noise is often categorized by its characteristics, such as frequency range, duration, and amplitude. Common forms include broadband noise, impulse noise, and harmonic distortion. Understanding these characteristics helps engineers and system designers evaluate how noise interacts with different types of electrical and electronic systems.
In commercial and industrial settings, electrical noise is not inherently a defect but rather a condition that must be accounted for during system design, equipment selection, and performance evaluation. Recognizing potential noise sources and how they interact with conductors and devices is essential for maintaining reliable operation across interconnected systems.
Also referred to as electromagnetic noise or electrical interference.
Electrical noise considerations are commonly addressed by organizations such as IEEE, IEC, FCC, and NEC through guidelines related to electromagnetic compatibility and system performance.
The concept of electrical noise became prominent with the expansion of electrical grids and electronic systems in the twentieth century. As electrical and electronic devices increased in complexity and density, the need to understand and control unwanted disturbances became a fundamental part of electrical engineering.