If the dimension requirements are high and it's considered more formal, you may need to use AutoCAD for drawing. This allows placing different categories of devices on different layers, which makes it easier to update and modify drawings later on.
In addition, if you prefer simpler solutions, Microsoft Office packages like Visio also have options available within them. Some companies use Excel to create these charts, and there are some methods used within Excel to make these shapes smaller and more transparent, but this would likely require certain level of precision in terms of appearance. If you simply want to represent something visually, using PowerPoint could be another option."
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