[Jewelry making - Article 00040] - Re: [Orchid] Anodzing Power Supply

[jesse brennan]

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    You really need both - particularly in the 240 volt world. The GFI
    protects  against  grounding problems., but not against across the
    line contact. The isolation transformer can reduce these risks a
    little  but not totally either. The GFI really does its thing with
    faulty equipment-- the stuff where you feel little tingles when you
    touch it. The devices disconnects the supply very rapidly. At lower
    voltages  dry skin protects against lethal shocks. Wet conditions
    change this. 

    GFIs were a little expensive when they were first available and the
    location requirements for their use was less than it might be if the
    codes were  adopted today. They are cheap in the US now and really
    belong more places -- particularly in workshop areas. 

    I just reposted comments  "Electrical shocks" it goes into this
    further particularly see the tutorial found at:
    http://www.physics.udel.edu/~watson/scen103/colloq2000/safety.html 

jesse

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