[TCML] NST failure ?? variac problem too

["Shaun Epp" <scepp@xxxxxxx>]

Hello group,

Well I haven't posted here it a while, but I was testing a new NST filter 
that I just built with my 12Kv/60mA NST and el cheapo variac and I popped 
the breaker.  The power switch on the variac was turned off, it's just a 
switched hot and the dial was set to zero.  I went to plug in the NST, just 
as I inserted the plug into the variac the lights in the room dimmed and pop 
goes the breaker  : - 0

It turned out that the Hot and Neutral was reverse at the AC receptical 
where I plugged in and the way that my variac is wire, a full 120 VAC to GND 
went to the NST.  Now I don't think that this should case the breaker to 
pop.  I'm under the assumption that the primary is floating and the 
secondary is supposed to be center tap grounded.  Please correct me if I'm 
wrong.

I checked the NST with a ohmmeter I I measure 3.3 and 3.7 ohms to ground 
from the 120VAC terminals. ???????
Each secondary terminal was about 2.5K ohms to ground.   It's an Allanson 
type 455B if that helps.  Is my NST blown??

The variac is one of the china built white ones, a 2090VR.  This incident 
could have been dangerous!  I think I have to put a different switch on it 
that opens the hot and neutral.  Anyone modified one of these?

thanks,

Shaun Epp 

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