Re: [TCML] Pushing a variac beyond rating

[Jim Lux <jimlux@xxxxxxxxxxxxx>]

On 5/20/11 10:07 AM, Nicholas Hall wrote:
> Hello list,
>
> I have a Staco 5A variac that I've used with my 15/30 NST powered coil with
> no problems.  I've now upgraded to a 15/60 NST.
>
> I'm wondering how Variacs fail and if it's Ok to overload them for short
> periods.  I'm also wondering if keeping it in transformer oil would help.
They fail by overheating: melts the insulation off the windings, for 
instance..
Yes, it can be overloaded for a short time.

You could, I suppose, put it in oil, but I've never seen it done.

Maybe a cooling fan
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