RE: Interference-SSTC

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

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

In a message dated Tue, 5 Mar 2002 10:24:31 PM Eastern Standard Time,
"Tesla list" <tesla-at-pupman-dot-com> writes:

> Original poster: "Lau, Gary by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Gary.Lau-at-compaq-dot-com>
> 
> The metal box, the Variac frame, and anything else that you will be
> touching should be connected to the 3rd wire mains ground.  I don't connect
> any part of my coil to the 3rd wire ground, although there is some
> controversy over what to connect the NST case to.  I don't know what your
> circuit is so I can't comment of what it's ground should go to.  
> 
> Gary Lau
> MA, USA
> 
> >Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" Fucian-at-aol-dot-com
> >
> >So where do i connect the ground?Do i use the ground wire for both the
> >metal box and the circuit ground?
> >
> >MAtt
> 
> >> Original poster: "Lau, Gary by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> ><Gary.Lau-at-compaq-dot-com>
> >> 
> >> If you have the mains neutral tied to the system ground, this is a serious
> >> No-No.  Since the neutral is a current-carrying conductor, it will develop
> >> a voltage drop along its length.  Depending upon its length and the amount
> >> of current through it, there will be a considerable potential developed
> >> between the neutral (at your TC), and true (3rd wire mains) ground.  
> >> 
> >> Connecting the neutral to your TC ground is also a serious safety problem.
> >> If the neutral wire should be broken or interrupted, your TC "ground" will
> >> be at "hot" potential!
> >> 
> >> Gary Lau
> >> MA, USA
> >> 
>  
> >>> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> >>><Fucian-at-aol-dot-com>
> >>> 
> >>> I am still having shocks from the coil.I have checked everything.
> >>> 
> >>> A few points that could be probs are:
> >>> 1-the power in for the primary is from a variac.The terminal where
the hot 
> >>> wire is connected to the variac is also connected to the rectifier.The 
> >>> Neutral wire is connceted to the ground of the entire system.The ground
> wire 
> >>> goes to the metal enclosure.
> >>> 
> >>> There is probably a wiring problem here.I dunno.It SEEMS to work fine.
> >>> 
> >>> 2-ALl the pots and the on switch to the 555 timer is bolted on the metal 
> >>> enclosure.If there is a wiring problem with the power in for the
primary, 
> >>> this would explain how the heatsink has a potential.
> >>> 
> >>> Matt

My circuit inside the metal box is just a 555 timer and its regulated
input.I fixed the problem though.No more 122vac across the circuit!YES!no
more shocks.I did manage to kill a mosfet again last night while pushing
the coil when it was out of tune.But i have more.

Matt