Insulating wire

Discussion in 'General Electronics Chat' started by LDC3, Jul 2, 2013.

  1. LDC3

    Thread Starter Active Member

    Apr 27, 2013
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    I recently bought some bare nichrome wire and I would like to know how to insulate it so I can make a coil to place in front of a fan to heat the air.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,645
    2,344
    Hello,

    Have a look at the picture of this hairdryer on how stuff works:
    http://home.howstuffworks.com/hair-dryer3.htm

    The wire is wounded around a crossed piece wich looks like mica.

    Also ceramic material would work.

    Bertus
     
  3. KJ6EAD

    Senior Member

    Apr 30, 2011
    1,425
    363
    The usual way is to leave the wire bare and arrange it on ceramic insulators. In some lower temperature applications it can be sleeved with teflon or silicone tubing.
     
  4. wmodavis

    Well-Known Member

    Oct 23, 2010
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    Electrical insulation will also insulate for heat transfer which sounds like your intended purpose.
     
  5. crutschow

    Expert

    Mar 14, 2008
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    3,221
    What are you insulating it from?
     
  6. tracecom

    AAC Fanatic!

    Apr 16, 2010
    3,869
    1,393
    I tried lots of materials, but only two worked: ceramic and mica. Mica is better, but more fragile to work with. For ceramic, I bought some small tile pieces at Lowe's and used a diamond point drill to penetrate them. Either way, you then face the problem of connecting the nichrome to the copper feed wires. I ended up using mechanical (e.g., nut and bolt) connections.

    You can also wind a coil on a bolt, and then turn the coil off the bolt, and let air be your insulation. Just don't let the turns touch or your resistance will be lowered. Here's a good introduction.

    http://www.cecs.wright.edu/balloon/images/2/22/Nichrome_Wire_Heating_Element_Design_Basics.pdf
     
  7. studiot

    AAC Fanatic!

    Nov 9, 2007
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    Get some chemists' glass strirring rods or tube, cut into suitable lengths.

    Stick the rods into a blob of epoxy putty as a hub and create a star like the spokes of a wheel.

    Wind the nichrome wire in a spiral fashion, over and under the rods, round and round like a spider web or basket weave fashion.

    This will create a rigid, self supporting, heatproof structure you can use.
     
    PackratKing likes this.
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