The PCB "keepout area" is merely as it sounds: is actually a place that should end up being free of elements and PCB traces.
The expression component includes any electrical, mechanical, or electro-mechanical gadget. And, keepout areas should be maintained under just about all application and environmental circumstances.
Now you could be thinking in order to yourself, "Of course! This specific is obvious. " Many designers and engineers think the same way, in addition to, because of this, they often trivialize the issue and after that take too lightly it, overlook it, or perhaps completely forget about that. This happens all also often when a specialized engineer, such as a hardware design electrical industrial engineer, stays in their own executive world—typically referred to because a "silo"—and doesn't take into account other factors or applications regarding the PCB.
An illustration of an application that will, perhaps, might not be regarded by whether design industrial engineer or a PCB structure person, is how the PCB may be used in the course of board bring-up and/or fine-tuning. As an example, Figure 1 beneath shows a 3-pin debug header (J1) that can be utilized by the test executive group for troubleshooting or perhaps updating firmware.
Figure one. Example of an interference issue due to the particular lack of a PCB keepout area.
As can end up being seen in the figure, the header has zero white outline associated along with it—which typically denotes a new PCB keepout area. Provided the "absolute" interference concern, and perhaps the "possible" interference issues, there's simply no possible way—short of eliminating the component(s)—to attach typically the mating connector. This quickly overlooked interference issue may possibly cause respinning the board (and getting the difficulty of management).
By assessment, Figure 2 below exhibits an example of a new good keepout area regarding a slide switch. With out the white outline keepout area, it could be tempting for a PCB layout artist to put elements next to the slide that might interfere with the swap when it is shifted to the other place.
Figure 2. An example of an excellent keepout location for a slide switch.