Chassis Ground in Circuits


In any circuit or electronics devices the outer cover or framework of the device or the circuit is called the Chassis.


Grounding is the process of determining  a Zero Reference level point and connecting all other devices to it for a common return path for current.

Chassis Ground:

It is a common practice to mount electronic components to a conducting metal sheet or a non-conducting plastic board with printed wires ( Printed Circuit Board – PCB ) , When the chassis or  PCB is used for building the circuit it is a common practice to regard the conducting body of the chassis or PCB as the common ground.

Chassis grounding makes the return of current easier and efficient , because chassis is a good conductor it provides a good path for the return of current from various components in a circuit. As the chassis is grounded so it is considered to be in Zero Reference Level   and all voltage measurements in the circuit are done with respect to the chassis.

When using a Metal Chassis the body of chassis itself acts as the chassis ground and when using a PCB a rim of solder around the edge of the PCB acts as the ground.

The following figure shows how we can denote chassis ground in a circuit and how the chassis ground serves as a return path for the current:

chasis ground

chassis ground

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