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Chassis ground

Discussion in 'General Electronics Discussion' started by Chengjun Li, Dec 18, 2014.

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  1. Chengjun Li

    Chengjun Li

    84
    7
    Oct 21, 2014
    Hi all,

    I saw many equipments have the grounding symbol on their chassis,like shown below
    upload_2014-12-18_11-49-26.png
    upload_2014-12-18_11-50-55.png

    upload_2014-12-18_11-50-11.png

    I was wondering why we need to ground these chassis?
    I think the ground line coming out of the outlet has already grounded the equipment chassis, why we need to do that again?
     

    Attached Files:

  2. Gryd3

    Gryd3

    4,098
    875
    Jun 25, 2014
    There is a great article here to read over:

    http://web.mit.edu/~jhawk/tmp/p/EST016_Ground_Loops_handout.pdf
    (Check Page 8)

    Relying on the outlet 'ground' may not always provide the best results... so using a chassis ground and ensuring they are grounded to the same location can help decrease inadvertant current flow between devices.
     
    hevans1944 and Chengjun Li like this.
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