MagSafe power adapter

Discussion in 'MacBook Pro' started by asp30deuce, Dec 12, 2010.

  1. asp30deuce macrumors newbie

    Joined:
    Nov 15, 2010
    #1
    Dumb question, but how come the MBP MageSafe power adapter doesn't have a ground prong like all other laptop power adapters have? :confused:
     
  2. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #2
    It does, on the extension cord that comes with it. http://support.apple.com/kb/HT1630

    [​IMG]
     
  3. iPhone1 macrumors 65816

    iPhone1

    Joined:
    Apr 2, 2010
    Location:
    San Diego, CA
    #3
    It does if you use the extension. Other than that, Apple must think the power output doesn't warrant an extra prong.
     
  4. deeddawg macrumors 604

    Joined:
    Jun 14, 2010
    Location:
    US
    #4
    Lenovo's don't. Nor do some Compaq/HP.

    I prefer this for travel adaptors since the two-wire cables pack smaller.
     
  5. asp30deuce thread starter macrumors newbie

    Joined:
    Nov 15, 2010
    #5
    Is it any less safe without the ground prong? I would think it should be there in the event of a power surge.
     
  6. Eddyisgreat macrumors 601

    Joined:
    Oct 24, 2007
    #6
    eh...just don't use the two prong during a thunderstorm (or your Mb, for that matter). The duckhead (2 prong adapter) wouldn't be as portable if they had to jimmy a ground plug onto it, though I would pick one up if available.
     
  7. jlc1978 macrumors 68000

    jlc1978

    Joined:
    Aug 14, 2009
    #7
    The ground plug doesn't really protect from surges as much as from faulty wiring resulting in a hot case and subsequent shock. A three prong plug connects a metal case to ground to avoid it become hazardous in the event of an internal short.
     
  8. Fubar1977 macrumors 6502a

    Fubar1977

    Joined:
    Jul 30, 2010
    Location:
    North Yorkshire, UK
    #8
    I find that if I use my power supply (UK) without the extension I get a "tingle" of electricity through the body of the MBP.
     
  9. deeddawg macrumors 604

    Joined:
    Jun 14, 2010
    Location:
    US
    #9
    I know very little about UK wiring, but in the US that's a sign of a problem with the neutral side of the outlet. Smart (safe) thing to do is to have the wiring checked out by a qualified electrician.
     
  10. croooow macrumors 65816

    croooow

    Joined:
    Jul 16, 2004
    #10
    We have a lot of Dell laptops at work and many of them did not come with a grounded power supply, but not all.
     
  11. Fubar1977 macrumors 6502a

    Fubar1977

    Joined:
    Jul 30, 2010
    Location:
    North Yorkshire, UK
    #11
    It does not matter which outlet I use, even in a different building or with a different magsafe.
    I`ve heard of this "issue" numerous times with the MBP.
    It also occurs if the MBP is not plugged into the mains itself but is connected to, say, a mains powered USB hard drive. MRoogle it...:)
     
  12. vincenz macrumors 601

    vincenz

    Joined:
    Oct 20, 2008
    #12
    That can't be good for the innards of the MBP...
     
  13. Reddmanz macrumors regular

    Joined:
    Jul 23, 2010
    #13
    I know just what you mean. If you stroke your fingers across the body its like a weird vibration?

    I get this is some (not all) plug sockets in my house. Never noticed any negetive effects on my Mac so Im not worried. Plus it feels kinda cool :p
     

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