Re: shunts/Magnetek NST

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <FutureT-at-aol-dot-com>

In a message dated 4/18/01 1:17:40 PM Eastern Daylight Time, tesla-at-pupman-dot-com 
writes:

> 
>  harvey,
>  i have a 15\60 franceformer that i depoted in my modified oven, it is
>  without shunts. just a BIG core.
>  marc m.

Harvey, Marc,

The shunts in a Jefferson (magnetek) NST are sort of "built in", in the sense
that they project from the outer part of the core and go between
the primary and secondary coils.  Then there's a narrow air gap
between this shunt area and the inner core.  Pieces are steel
are placed into the air gap by the manufacture to adjust the
NST characteristics to be just right.  The presence of the 
metal between the primary and secondaries is what makes
the NST shunted.  In an MOT by constrast, the shunt pieces
are little separate pieces that can be knocked out with a 
hammer, otherwise it's the same concept.  In the Jefferson
NST, you'd have to cut the shunt's out with a shears or saw, 
after dismantling the NST and core pieces.  NST's are all 
current limited using shunts of some sort.  With the shunts
removed, NST's will deliver a lot more than their rated current.

John Freau