[Jewelry making - Article 00029] - Re: [Orchid] Anodzing Power Supply

[adamlists]

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>     [...] if you take a voltmeter and  touch one probe to a grounded
>     surface and one probe to a hot lead you will read the line voltage.
>     If you you were to be unfortunate enough to touch both a grounded
>     surface and the hot lead you would be shocked and possibly killed. 

    Agreed. When anodising niobium and titanium we are exposed to both
    leads, the anode and (throught the electrolyte) the cathode. I
    imagine that an isolator would be less than perfect an a safety
    device for anodising as the danger we face is not so much
    line-to-ground as line-to-neutral. 

>     [...] The GFI - Ground Fault Interrupter, is also called Safety
>     Switch, RCD - Residual Current Device, ELCB -Earth Leakage Circuit
>     Breaker, Core Balance Relay and other names in different places.
>     Before these devices were readily available, the isolation
>     transformer was the only protective device available.  It is still
>     widely used to work (repair) on circuits that have mains potential
>     circuitry or to isolate test equipment earths to prevent short
>     circuits when testing such circuitry. 

    Would you say then that a GFI (RDC etc) is VERY important in an
    anodiser? 

>     [...] As a last point, you were to use a standard "non isolating"
>     variac with GFI protection and contact something earthed (say when
>     anodising), it is possible to trip the GFI. 

    Meaning it works as well as an isolation transformer? 

Regards,
Brian as well.

B r i a n   A d a m   
e y e g l a s s e s   j e w e l l e r y
518 South Titirangi Road
Auckland NEW ZEALAND
ph +64 9 817 6816 
www.adam.co.nz

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