What Size wires should I use for 3500 Volts

Discussion in 'General Electronics Chat' started by t00t, Jun 24, 2015.

  1. t00t

    Thread Starter Member

    Jan 22, 2015
    55
    1
    I have a transformer changing 240v to 3500v .

    What size wires (diameter) should I use to prevent a burn out from such high voltage .

    Additional information :

    12kHz output .

    1.5 meter length.

    Thank You
     
  2. sirch2

    Well-Known Member

    Jan 21, 2013
    1,008
    351
    Wire diameter is dictated by current, not voltage, what is the current draw. Insulation thickness is determined by voltage.
     
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  3. #12

    Expert

    Nov 30, 2010
    16,283
    6,795
    I have a couple of rolls of 5000 volt test lead wire. Stranded, nice and floppy, resistant to abrasion. I say this to suggest that the right wire is certainly available.
     
  4. t00t

    Thread Starter Member

    Jan 22, 2015
    55
    1
    What thickness insulation should I use for 3500 volts ?
     
  5. sirch2

    Well-Known Member

    Jan 21, 2013
    1,008
    351
    When you buy insulated wire it generally states the insulation rating, just buy something rated well about 3500V. You still need to consider how much current the wire needs to handle.

    Are you sure you want to be messing with 3500V?
     
  6. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
    1,438
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    You must check the specification of the cable. Not all insulators are the same so thickness is not the only factor to consider.
     
  7. Doros

    New Member

    Dec 17, 2013
    20
    0
    You need a HV wire, you should search there. There are a lot of manufactureres, like Belden, Alpha wire etc. But also you need the current for the final decision
     
  8. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    Specify the load VA rating that you will be using with those wires, then the gauge can be determined.
    Either way the insulation should be rated at least more than 3.5KV.
     
  9. wmodavis

    Well-Known Member

    Oct 23, 2010
    737
    150
    Spark plug wire connects 20-30KVolts to the plugs.
     
  10. crutschow

    Expert

    Mar 14, 2008
    13,006
    3,232
    But such wires often have a large series resistance to suppress EMI from the spark, so it may not be suitable for an application that draws any significant current.
     
  11. shortbus

    AAC Fanatic!

    Sep 30, 2009
    4,009
    1,530
    Unless he could find something like the old Packard 440, with a wire core instad of the graphite impregnated stuff they make today. Last area I worked in at Delphi Packard made the complete ignition cables from wire to boots to assembly.
     
  12. tcmtech

    Well-Known Member

    Nov 4, 2013
    2,034
    1,653
    Solid core spark plug wires are still a common item that can be gotten at most any automotive parts store.

    They are used in older vehicles and equipment that use the old points and condensor type ignition systems. Same with lawn and garden equipment magneto systems.

    The next option for HV rated wire is common neon sign wiring. Most of that comes in 15 - 30 KV ratings and can be purchased online or at any signage company.
     
  13. Lestraveled

    Well-Known Member

    May 19, 2014
    1,957
    1,215
    EBay has lots of ads for high voltage wire. I suggest you look for the silicone jacketed. I have used the Dearborn (now Alpha) brand in the past with good success. Wire with a 5KV rating will not be hard to find.
     
  14. KeepItSimpleStupid

    Well-Known Member

    Mar 4, 2014
    1,144
    203
    Silicone insulated wire is commonly used. One application I had to deal with was supporting 40 kV AC, low current and 22 A DC @ 40 VDC on the same cable.
     
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