In the vicinity of electric power wiring there will always be stray magnetic fields, particularly from utility lines oscillating at 50 or 60 hertz. This forms a closed loop through the ground conductors of the power cords, which are connected through the building wiring. When signal cables are connected between A and B, the shield of the data cable is typically connected to the grounded equipment chassis of both A and B. A common example is two pieces of electrical equipment, A and B, each connected to a mains power outlet by a 3 conductor cable and plug containing a protective ground conductor for safety. ( January 2017) ( Learn how and when to remove this template message)Ī ground loop is caused by the interconnection of electrical equipment that results in multiple paths to ground, thereby forming closed conductive loops through the ground connections. Unsourced material may be challenged and removed. Please help improve this section by adding citations to reliable sources. Removal of safety ground connections to equipment in an effort to eliminate ground loops also eliminates the protection the safety ground connection is intended to provide. The use of differential signaling can provide rejection of ground-induced interference. Wiring practices that protect against ground loops include ensuring that all vulnerable signal circuits are referenced to one point as ground.

Ground loops are a major cause of noise, hum, and interference in audio, video, and computer systems. Current may be produced in a circular ground connection (ground loop) by electromagnetic induction. This is typically caused when enough current is flowing in the connection between the two ground points to produce a voltage drop and cause two points to be at different potentials. In an electrical system, a ground loop or earth loop occurs when two points of a circuit are intended to have the same ground reference potential but instead have a different potential between them.

( July 2014) ( Learn how and when to remove this template message) Please help improve it to make it understandable to non-experts, without removing the technical details. This article may be too technical for most readers to understand.

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