Use right ground symbol

Use right ground symbol in your electronics schematics and other drawings.

Earth-ground symbol represents a real connection to earth. That connection could be for example 10-foot-high copper-clad steel bar driven into the earth (at your premises or nearby provided by power company) or metal water lines. That earth ground is wired to the neutral of your house wiring at the breaker panel. You can reasonably use the earth-ground symbol for the ground pin on the electrical outlet. Your electronics equipment schematic should use the earth-ground symbol to indicate connection to the electrical outlet ground pin on equipment plugged to wall outlet.

It is bad practice to use earth-ground symbols for chassis common. You an use the chassis common wherever a power supply or circuit card connects to the chassis. In a circuit board schematic you can use chassis symbol when a standoff screws the PCB to the chassis.

Signal-ground symbols are most suitable for most circuitry on a PCB. A design can have several of these symbols, with notations to identify them.

Information source: EDN magazine article Draw the line: Isolation shields systems from shocking surprises



  1. Dudley Khouri says:

    Howdy, your site is on air in the radio! Good job mate. Your posts are truly great and bookmarked. Regards

  2. double boiler says:

    I can see you might be an expert at your field! I am launching a website soon, and your facts will probably be extremely exciting for me.. Thanks for all your aid and wishing you all of the success.

  3. double boiler says:

    Thanks to your info, I am going to be checking in..thanks

  4. Andrew Clouser says:

    wow excellent post and geeky tech blog really love the design : )

  5. shields electronics says:

    I was looking for something completely different,got your page Use right ground symbol « Tomi Engdahl’s ePanorama blog and found it Interesting.Nice Post on shields electronics…

  6. tomi says:

    Custom style.

  7. SEPAN” says:

    destination like California, Florida, or New York, check the housing swap section of section

  8. how to use aloe vera plant for hair says:

    It is proven time and time again that information’s worth is not the main factor which impacts article promotion results. Instead, the degree at which you manage to broadcast information as speedily as possible. And I’m not referring to article distribution, but to the fluency of your writing.

  9. how to grow aloe vera plants indoors says:

    I realy liked your angle that you have on the topic. Certainly wasn’t planning on this at the time I begun browsing for tips. Your ideas were totally easy to get. Happy to find that there’s an person here that obviously understands on the spot what its is talking about.

  10. Francina Kuiz says:

    Hi would you mind stating which blog platform you’re using? I’m looking to start my own blog soon but I’m having a hard time making a decision between BlogEngine/Wordpress/B2evolution and Drupal. The reason I ask is because your design and style seems different then most blogs and I’m looking for something unique. P.S Apologies for getting off-topic but I had to ask!

  11. llll says:

    Great post at Use right ground symbol Tomi Engdahl’s ePanorama blog. I was checking continuously this blog and I’m impressed! Extremely helpful info specially the last part :) I care for such information much. I was looking for this certain info for a long time. Thank you and best of luck.

  12. asdfgh says:

    what is a difference b/w chassis, signal and system common???

    • tomi says:

      In some circuits, the ground returns for analog signals are kept separate from the ground returns for digital signals to limit the possibility for coupling noise from the digital signals into the analog signals. Additionally, in some circuits the chassis, or enclosure, ground may be connected to the electrical system ground in your home or office for electrical safety reasons. Each of these different grounds may be represented by a different ground symbol.

      It is useful to think of some of the different functions of a ground:
      1. A ground provides a return path for current
      2. A ground provides a reference point for measuring other potentials or signals
      3. A ground provides a safety connection for metal enclosures
      4. A ground provides a shield to screen out electromagnetic noise, as in a coaxial cable or Faraday cage
      5. A ground plane is needed for an antenna to function properly
      6. In electronic circuits, the ground is often used as a heat sink to dissipate heat from components

      It is often a good idea to use different “grounds” for different functions. For example in electrical wiring both the neutral and protective ground wires are ground connections, but one serves as a current return path and the other is a safety connection. There are very good practical reasons to have these implemented as two different wires.

      Read more:

      Many electronics designs split 3 ground: Power GND, AGND, and DGND.

      Power ground only for power converter system ground such as regulator gnd, capacitor gnd etc.

      AGND is an analog signal ground for sensor, amplifier, analog part of ADC, etc.

      DGND is the diginal ground for digital signal like MCU, communication IC, memory, etc.

      The primary concern in real-world grounding is considering current flow and current paths. For example in a PC board, power returns and high-speed clock signals usually use different copper ground traces than low-level audio or sensor signal reference grounds, so that the transient current from switching does not affect the ground reference for tiny signals. The grounds are tied together at one point, so that there is no circuit path for current to travel between the paths, but they are at the same potential voltage.

  13. freep says:

    Fantastic site you have here but I was curious if you knew of any forums that cover the same topics talked about in this article? I’d really love to be a part of group where I can get feed-back from other knowledgeable individuals that share the same interest. If you have any suggestions, please let me know. Cheers!

  14. oglądaj najnowsze says:

    More people know Tom Fool than Tom Fool knows.

  15. consultant says:

    What i do not understood is in fact how you’re not really a lot more neatly-favored than you may be now. You’re very intelligent. You recognize thus significantly on the subject of this subject, made me for my part believe it from a lot of various angles. Its like women and men don’t seem to be involved except it’s something to accomplish with Woman gaga! Your personal stuffs outstanding. Always handle it up!

  16. Glenna Emdee says:

    whoah this weblog is great i love reading your posts. Keep up the good work! You realize, lots of persons are hunting round for this information, you could help them greatly.

  17. Stevve says:

    I’m confused. I’ve always known chassis ground to be a horizontal line with FOUR diagonal lines extending downward and to the left with not one in line with or connected to the vertical line. Example:

  18. Affordable Mobiles says:

    Very informative for me.Thanks for share useful information.

  19. Johnf131 says:

    with people like one to grant visibly all of that numerous populaces would am inflicted with sold for electronic ebook to create selected jumps in favor of their unique terminate, mainly right away

  20. says:

    I like the helpful info you provide in your articles. I will bookmark your
    blog and check again here frequently. I am quite certain I will learn lots of
    new stuff right here! Good luck for the next!

  21. ทะเบียนสวย says:

    Very nice post. I definitely love this site. Thanks!

  22. Maybell says:

    What’s up, of course this article is actually nice and I have learned lot of
    things from it about blogging. thanks.

  23. crossword puzzles says:

    Thank you for sharing the information, I really enjoyed the articles from you. I hope to experience more great content.

  24. play Badland says:

    It has been repeatedly demonstrated that the value of the information is not the primary factor influencing the success of article promotion. Rather, it should be your ability to spread information as quickly as feasible. And I’m not talking about how many articles you distribute; I’m talking about how fluidly you write.

  25. Elune says:

    It has been frequently shown that the success of article promotion is not primarily influenced by how valuable the material is. It should be your capacity to disseminate knowledge as rapidly as is practical. And I’m not only referring to how many articles you publish; I’m also referring to how easily you write.


Leave a Comment

Your email address will not be published. Required fields are marked *