MacBook Pro electricity leak in housing when not grounded

Discussion in 'MacBook Pro' started by poiihy, Nov 1, 2014.

  1. poiihy macrumors 68020

    poiihy

    Joined:
    Aug 22, 2014
    #1
    When I use the small foldable plug (which does not have a ground), there is some electricity leak into the alumimunium casing. It is small but noticeable when rubbing the flat part of fingers on the case. When I use the extension cable for the power adapter (which has a ground) I do not feel this buzz. I also do not feel it when not plugged into the wall. What is it? Is it normal? Should I use the grounded cable?
     
  2. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #2
    That is normal for nearly every ungrounded portable Mac that has a metal casing. Even the desktop machines will do that on occasion when they are not properly grounded.
     
  3. poiihy thread starter macrumors 68020

    poiihy

    Joined:
    Aug 22, 2014
    #3
    What causes it?
     
  4. sjinsjca macrumors 68000

    sjinsjca

    Joined:
    Oct 30, 2008
    #4
    Does the behavior change if you reverse the plug?
     
  5. poiihy thread starter macrumors 68020

    poiihy

    Joined:
    Aug 22, 2014
    #5
    No
     
  6. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #6
    It's the 50/60 hertz hum of the AC power. Most electrical devices have it, but Macs display it most because of their bare metal cases and how they are grounded.
     

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