By grinding an electric current occurs when a continuous line suspended and will be closed by a detour: The bypass line is looped into the continuous line. In the case of the railroad, the term describes the confluence of a route into a continuous one, which is often done via a loop-shaped track form and overpass structures .
If an effects device is looped into an existing signal path, the signal path is separated and the audio signal is passed through the effects device. Audio mixing consoles offer so-called insert sockets , which mechanically cut the internal signal path when a plug is inserted. The inserted loop-in cable must contain an outward path to and a return path from the effects device so that the signal path is closed again.
In the case of high-voltage overhead lines , branches to substations can be looped in . Not only is a T-shaped tap set, but both sides of the continuous trunk line are routed separately to the substation and connected there. The advantage of this design: The trunk line can be interrupted in the (mostly remote-controlled) substation, e.g. for partial shutdowns for maintenance purposes.
The masts on which the looping is carried out are often built in such a way that the looping can be converted into a branch with relatively little effort.
Ground in or ground in?
The participle "grinded" belongs to "grind" in the meaning "to create a grind": A blade or a gemstone is grinded. With a looping in within the meaning of this article, however, nothing is ground, but a loop is formed, the participle is therefore "looped in".