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  1. #1
    when and why do i need

  2. #2
    Join Date
    Sep 2002
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    South Dakota
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    6,579
    Your question is not clear. A dielectric is just another name for insulation. Plastic insulation on a wire is a dielectric. The insulation between the two plates of a capacitor is a dielectric. What exactly are you asking?

  3. #3
    when going from copper to brass to steel pipping do you need a die-electric the brass and steel

  4. #4
    Join Date
    Sep 2002
    Location
    South Dakota
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    6,579
    Yes, you use a dielectric coupling. It is a coupling with insulation in the middle so the two dissimular metals do not come in contact. When two dissumular metals touch a small voltage is generated and this in turn causes a small current. The result of this is electrolysis or basically the same thing as occurs in electroplating. In this case we call it corrosion.

  5. #5
    copper to brass no prot need .steel to brass no prot neededtherefore would the brass act as protection in copper ,brass,steel run

  6. #6
    Join Date
    Sep 2002
    Location
    South Dakota
    Posts
    6,579
    Each combination of dissimular metals in contact produce electrolysis to a different degree depending upon the combination of metals involved.

    I see you are a pipefitter by trade. I bet you have a pipefitting book that will give you an exact answer for the combination you are using. Frankly, I don't have a more specific answer for you. I know in gas fitting we fit brass and copper to black pipe without a dielectric coupling without any problems. But, water in the pipe instead of gas may change that.


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