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Is 110v UK same as 110v US??

Discussion in 'Electrics UK' started by wifeiswitteringagain, 6 Nov 2007.

  1. wifeiswitteringagain

    wifeiswitteringagain

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    I have seen a power tool for sale but it is from the US. It is 110v. Will it work as normal on my UK 110v transformer. Does anyone know for definite if the frequency in the US for 110v is the same as the UK? The power tool is cheaper than the UK offering so I'm tempted. Tnx.
     
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  3. securespark

    securespark

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    Isn't the US 60 Hurts?
     
  4. Adam_151

    Adam_151

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    The frequency used in the states is 60hz, while this side of the pond its 50hz, expect motors to run hotter :!:
     
  5. bernardgreen

    bernardgreen

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    American frequency is 60 Hz ( cycles per second ) and the UK frequency is 50 Hz.

    Power tools with motors with brushes will work on 50 or 60 Hz but not at best efficiency.

    An American ( 60 Hz ) fed with 50Hz may run hotter and possibly faster as the inductance ( resistance ) of the motor coils is lower for 50 than for 60 and more power will be taken.

    Induction motor for 60 Hz will run slower on 50Hz and may run hotter.

    The cheaper the motor the more pronounced the heatig effect is.

    Some good quality brushed motors will run well on both frequencies.
     
  6. wifeiswitteringagain

    wifeiswitteringagain

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    Thanks for the responses chaps. The tool I'm thinking of buying is a portable makita woodworking compound mitre saw. When in use it's an intermittent cutting process. the motor will probably only run for 10-20 secs max. at a time. The saving is a couple of hundred quid over the UK version. £280 vs £500ish for same tool. All that said, what do you qualified electrical guys reckon. Cheers.
     
  7. tim west

    tim west

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    it will be rated 120v the US supply, any frequency difference derived heat problems may well be negated by the lower voltage output from the transformer.
     
  8. wifeiswitteringagain

    wifeiswitteringagain

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    Thanks Tim. Would you buy a US one bearing in mind the short cutting times???
     
  9. Adam_151

    Adam_151

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    Not totally I wouldn't have thought, 110v@50hz is still 10% more volts per cycle than 120v@60hz, better than nothing though!
     
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  11. plugwash

    plugwash

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    It will probablly work

    It's lifetime may be negatively affected, you will have great trouble getting any warranty support, you won't be protected by UK consumer protection laws, you will almost certainly have to pay VAT and may have to pay import duty as well.
     
  12. tim west

    tim west

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    I personally would have no qualms about buying one
     
  13. breezer

    breezer

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    I wouldn't say may, more like WILL.

    importing / delivery company will do that, even after 5 months of you bringing it in, and as plugwash said, no g'tee since you have void it by running on wrong frequency / voltage
     
  14. tim west

    tim west

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    wasnt we taught at college that with a brush motor that the brushes actually have the effect of rectification on the AC current and therefore frequency will be of little importance to the windings
     
  15. bernardgreen

    bernardgreen

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    Not rectifying but commuting the polarity applied to the acctive coils on the armature. The AC supply reversals affect both field and armature magnetic polarities. ( Ooops jsut realise I forgot to say it is only motors with field windings that run on AC, permanent magnet motors won't ).

    The impedance of the coils is lower at 50Hz than it is at 60Hz so more current flows in the coils.
     
  16. tim west

    tim west

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    Mmmm I was taught different then, that the brushes themselves acted like rectifiers hence the need for suppression to stop the sparking caused by the DC from pitting the commutator.
     
  17. timtheenchanter

    timtheenchanter

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    correct me if Im wrong, but isnt UK 110V 55-0-55 relative to earth, and has no neutral as such, whereas US 110V is 110-0 relative to earth.
    would this not make a difference?
     
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