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Thread: Capacitors

  1. #1
    Join Date
    Jul 2009
    Location
    WV
    Posts
    21

    Question Capacitors

    Starting fall checks and I would like to know at what percentage below the rated MFD you would recomened changing it out to a home owner. Thanks

  2. #2
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,401
    10%

  3. #3
    Join Date
    May 2009
    Location
    Cummins, GA
    Posts
    1,563
    Check the label. Most are + or - .06%. But some are 10%.

  4. #4
    Join Date
    Sep 2012
    Location
    NW Louisiana
    Posts
    159
    Top of my head, MAX tolerance is 10% Run Cap, 20% Start Cap.

    CT

  5. #5
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,795
    Quote Originally Posted by Brent Ridley View Post
    Check the label. Most are + or - .06%. But some are 10%.
    Thats the manufacturing tolerance, that it could be off by when its brand new.
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  6. #6
    Join Date
    Dec 2004
    Location
    Grand Rapids, MI
    Posts
    625
    We say could / should at 5 or 6 % and needs at 10%.
    Also, inform the client what motor the capacitor is connected to and may damage if too low.
    luck dan

  7. #7
    Join Date
    Oct 2004
    Location
    Central WA
    Posts
    1,650
    Rule of thumb for the MOTOR's tolerance is 10%. As said before - the +- rating on the capacitor itself if the manufacturing tolerance. A 5mfd +- 6% could be 4.7 right out of the box.

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