Grinding in

from Wikipedia, the free encyclopedia
Mixing console with insert connections ( jack sockets ) on the top left in inputs 1 and 2 for looping additional devices into the signal path
Loop-in point on a 110 kV overhead line. The left cable on the front mast and the right cable on the rear one is interrupted by the loop-through.

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 .

Sound engineering

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.

Power supply

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".


  • Rolf Beckmann: Manual of PA technology. Basics, components, practice. 2nd Edition. Elektor-Verlag, Aachen 1990, ISBN 3-921608-66-X .
  • Siegfried Wirsum: Practical sound reinforcement technology. Device concepts, installation, optimization. Franzis-Verlag GmbH, Munich 1991, ISBN 3-7723-5862-4 .