Read about grounding | 15 Discussions | Page 1

  1. Mzzed

    Connect isolated ground to Earth?

    I am currently working on a high power class E amplifier which will sit inside a metal enclosure. It is powered by two power supplies - both are isolated but one of the power supplies is mounted in the same enclosure. The power supply itself is in a metal case and that case is connected to...
  2. J

    How do the electroscope leaves behave after grounding?

    Homework Statement A positively charged rod is brought near the knob of an uncharged electroscope and the leaves of the electroscope diverge. As the positively charged rod is held near the knob, the electroscope is grounded with a wire. Then the grounding wire and the positively charged rod...
  3. F

    Will this man get an electric shock

    If a properly insulated man touches with one hand +ve terminal of a 120 V battery and with another hand -ve terminal of (Edit: an another) 120V battery (two batteries are totally isolated, not connected in any way) then will he get electrical shock ? ( I am guessing , not). But if -ve terminals...
  4. adamaero

    Red (power: pin 2) wire for servo motor not connected

    Why is the red (power: pin 2) wire for the servo motor not connected to anything in this circuit? https://github.com/samyk/combobreaker/blob/master/Eagle Files/ComboBreaker_top.png Also, on the "bottom" schematic, the ground is connected to the feedback (potentiometer wiper) line...
  5. hackhard

    I Resistance from fingertip to Earth wire

    i connected one probe of digital mutimeter to the earth terminal of domestic ac supply and held the other probe. it showed resistance of 1.8Mohm . but when i touched that end (one i'd held) to the floor. it displays 1( beyond 200Mohm ). why so ? shouldnt resistance be lesser?doesnt any current...
  6. M

    Grounding mat not working

    Overview: I've made a grounding mat using a piece of copper speaker wire attached to the grounding prong on a wall plug (I removed the other two prongs). The other end of my copper wire is attached to a sheet of aluminum which I set on the floor like a mat. I checked to make sure that my wall...
  7. kamhogo

    Double-grounded circuit, find I across one of two resistors

    Homework Statement What is the current in the 2 ohms resistor? Homework Equations Kirchhoff's loop law The Attempt at a Solution Grounding does not affect how the circuit behaves, so I ignored the ground in and applied the loop law (clockwise from the negative terminal of the 9V battery...
  8. K

    Does a raised floor need to be grounded?

    Hello there, I have a question about a raised floor and it needing to be grounded or not. (I posted this question on a different forum but didn't receive an answer ) My only past experience with grounding a floor has been in data centers, where there is 120/208/480v above and below a raised...
  9. E

    Grounding resistance exercise

    Hi! I can't find the method of the solution to this question, it was an exercise on an exam.. There are two grounding electrodes buried in the ground. We make three measurments. First, we measure the first electrode's grounding resistance, which is: 6 ohms. Then, the second's: 7 ohms. Then the...
  10. neduet

    Earthing and Grounding or Protective Earthing

    1 “earthing” for bonding of equipment and circuits to common plant earth electrode potential, 2 “protective earthing (PE)” when this bonding is required for personal safety provisions 3 “grounding” for interference suppressing bonding of screens, sys- tems with ground level 4. low-impedance...
  11. G

    Can local voltage drop be developed over ground plane?

    Hello. The ground plane is sometimes used as current return path. If current is low frequency and amplitude is small then voltage rising due to current flow can be ignorable. However, what is return current is actually very high in both frequency and amplitude? In our lab, gas discharge...
  12. JJBladester

    Possible grounding issue - HDMI over CAT-6 electrical arc

    I was recently asked to help with some A/V stuff at my church. The goal was simple: Display HDMI video from a laptop to two LCD TVs. Since distance was an issue, I purchased an active HDMI-to-Ethernet converter. I've included a diagram for reference. When I went to plug the 3' HDMI cable...
  13. G

    Question for grounding of the electronics to Faraday cage

    Hello. Let's say there is a instrument needed to be EM wave-shielded in High voltage discharge lab. Building Faraday cage becomes necessary and the instrument is moved to inside the cage. The cage is grounded to lab ground and the frame ground of the instrument (it is also signal ground for the...
  14. G

    Floating Earth leads to dangerous case voltages - neutral OK

    I moved to Australia from the US and took my Crate amp and Ibanez electric guitar with me. To deal with the 240 VAC, I needed a step-down transformer. So I have this setup: The ground connector of the socket on the 120 VAC side got weak and stopped making connection (Note 1). So the guitar...
  15. M

    How to test a 1.5 pound magnesium anode

    Hello my name is Mike Moore and I work for Copperhead Industries, LLC We are a tracer wire manufacture for the underground non-metallic pipe utility sector, natural gas, water, sewer and telecom. We use magnesium anodes for grounding out the far end of the tracer wire system which completes...
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