Re: Pig setup help.

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

Original poster: Yurtle Turtle <yurtle_t-at-yahoo-dot-com> 

I have lotsa powerstats, so I can go either way. Using
ganged 120 volt powerstats, one can safely ramp up to
120 volts on each leg (for 240 volts). Using 240 volt
(or higher) powerstats puts one low voltage bushing at
-120 volt, while the other goes from -120 to 0 to +120
volts (for 240 volts). I don't think this is a
problem, and is a good reason not to use the neutral
bushing, but thought I'd mention it. When I used
ganged 120 volt powerstats, I felt safer working
around my pig, knowing there was little or no AC
applied, even if my motor starter failed to disengage.
Using 240 volt powerstats makes me more cautious in
ensuring my starter is disengaged.

Adam

--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > Original poster: Bart Anderson
 > <classi6-at-classictesla-dot-com>
 >
 > Hi Randy,
 >
 > Grounding the case to mains ground is for safety.
 > All equipment with direct
 > feeds should have their case connected to mains
 > ground (this includes the
 > transformer). In the event of a fault, we don't want
 > the case at a
 > potential that could be lethal. Should there be a
 > fault, the mains breaker
 > will trip and remove all power.
 >
 > Take care,
 > Bart
 >
 > Tesla list wrote:
 >
 > >Original poster: "Randy & Lori"
 > <rburney6-at-comcast-dot-net>
 > >Bart,
 > >
 > >Why the "mains" ground? I have read:
 > >2 or 3 RF Grounds
 > >1 Mains Ground
 > >1 Mains OK if filter is used
 > >
 > >Randy
 > >
 > >-----Original Message-----
 > >From: Tesla list [mailto:tesla-at-pupman-dot-com]
 > >Sent: Saturday, March 13, 2004 12:44 AM
 > >To: tesla-at-pupman-dot-com
 > >Subject: Re: Pig setup help.
 > >
 > >Original poster: Bart Anderson
 > <classi6-at-classictesla-dot-com>
 > >
 > >Hi Steve,
 > >
 > >Tesla list wrote:
 > >
 > > >Original poster: "steve"
 > <steve_vance-at-cablelynx-dot-com>
 > > >I have a question for the list. I have a 10 kva
 > pig I'm running
 > > >at 5 kva to power my coil my 6.5 inch coil. I was
 > reading the archives
 > > >and came across a post about running one of the
 > hv bushings and
 > > >the can to earth ground. Can't find enough
 > information to convince me
 > > >that I fully understand how to do this safely.
 > Someone correct me if
 > >I'm wrong
 > > >on this.... I run one of the hv leads to the can,
 > ground the can to
 > >earth, run
 > > >the other hv lead to one side of the tank
 > circuit, and the other side
 > >of
 > > >the tank
 > > >goes to the rf ground? Or does it need it's own
 > ground rod?
 > > >
 > > >Thanks for any help.
 > > >
 > > >Steve Vance
 > >
 > >You've got it right. The case should be tied to
 > "mains" ground. Then,
 > >240
 > >to the 2 low voltage bushings.
 > >
 > >To bring the inner primary at the same potential
 > (RF ground) as the
 > >bottom
 > >of the secondary, tie one side of the hv terminal
 > to RF ground and the
 > >other end to the tank. The hv terminal to RF ground
 > does not need it's
 > >own
 > >ground. RF ground is where the connection is.
 > >
 > >Take care,
 > >Bart
 > >
 > >
 > >
 > >
 >