a.
Circuit Grounding
The ideal " single point ground " concept insures that no ground loops are created. As the name implies, all circuit grounds are returned to a common point. This concept is shown in Figure 9.

While this approach looks good on paper, it is usually not practical. Even the simplest circuits can have 10 or more grounds, and connecting them at a common point becomes a physical challenge. The next best thing is a ground bus.
b.
Ground Bus
Bus bars are available or can be constructed to serve as an adequate substitute for single point ground. The bus bar is simply a heavy wire or copper bar of low resistance which can carry the maximum sum total of the load current back to the power supply. The bus can be extended along the length of the circuitry so that convenient connections can be made at various points. The use of a ground bus is shown in Figure 10.
http://www.ese.upenn.edu/rca/instruments/misctutorials/Ground/grd.html
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