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Can i plug a 115v power bar to 110v - 240v extension?

Discussion in 'General Electronics Discussion' started by computer-joe, Sep 24, 2017.

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  1. computer-joe


    Oct 6, 2016
    I have a simple question,

    The power in the wall is 250v (europe power)

    I have an extension plugged into the wall, the extension is rated 110v to 250v, so it didn't blow up, everything is good

    is is safe to plug the extension cord into the powerbar? the powerbar is only rated to 125v

    I feel it is safe because the extension cord is in between the power outlet wall and extension power bar

    would the extension cord downgrade the power?

    or do i have to buy a 110v to 250v rated powerbar

    wall250----> extension cord110-250 -----> powerbar125 -----> laptop

    i remember doing this in the past, and it worked fine, or maybe the powerbar was a 240v, i actually don't remember
    my numbers may be off a little,
  2. Audioguru


    Sep 24, 2016
    Most power bars do not convert 250VAC down to 125VAC.
    Will your laptop survive if it is fed a voltage twice as high as it needs? Most do not.
  3. computer-joe


    Oct 6, 2016
    my laptop will be fine, because the adapter for my laptop says 100-240

    what if i put a travel adapter after the extension cord

    wall250----> extension cord110-250 -----> travel adapter240v ------> powerbar125 -----> laptop

    do travel adapters convert down the power?

  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    No, travel adapters don't convert voltage.

    The power bar (multi outlet power board?) Should be fine. If it has a MOV in it to protect things from excess voltage, it will die immediately.
  5. computer-joe


    Oct 6, 2016
    well, i guess i'm forced to purchase a 240v power bar, they are about 10usd so it's not so bad

  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    I have a 110V power board that I use on 240V. The MOV died. Shrug.

    Sorry, I may have implied the power board would blow up. It's just the MOV. No huge concern, they normally die in a benign manner.
  7. Alec_t


    Jul 7, 2015
    That would be the safest option. There's a chance the insulation of a 110V rated power bar could break down on a ~ 240V supply.
  8. hevans1944

    hevans1944 Hop - AC8NS

    Jun 21, 2012
    And they almost never provide any indication they have died, leaving you unprotected against power line surges.

    Not that you should rely on a power bar or outlet strip to do that in the first place. Instead, use a small battery-operated UPS (Uninterruptible Power Supply) that floats the battery on rectified incoming power and then drives a power inverter from the battery power, thus isolating the output from the vagaries of "dirty" power line input. Make sure the UPS specs say it provides surge and sag protection, even if the back-up time is measured in minutes instead of hours or days.

    The key to stopping surges and sags is the battery-operated inverter between the power line and your sensitive equipment. Don't trust a two-dollar, designed-to-fail, MOV (Metal Oxide Varistor) device for this purpose. It's like lightning arresters for antennas: use them, but disconnect and ground the antenna when it's not in use.
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