What gets connected to RF ground?

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

Original poster: "Jeremy D. Gassmann by way of Terry Fritz <teslalist-at-qwest-dot-net>" <gassmajd-at-email.uc.edu>

Group,
         I have been doing research on grounding and what you ground to 
what (ie RF ground and mains ground) and I have found some conflicting 
advice.  On a number of web sites, the recommendation is to ground the 
bottom of the secondary as well as the center tap of the NST, and the 
center ground of the safety gap and filter capacitor.  Another site says 
that only the secondary gets the ground and the NST and safety gap and 
filter get house ground.  Another variation of the latter is the you leave 
the NST center tap ungrounded.  Still another different variation that goes 
along with the former is as follows:

*snip*

         You ground your variac housing to your neutral wire. All other 
coil controls, relay housings, control xfrmr cores, line RFI filters (run 
backwards) are grounded to the variac housing. Strap is taken from the 
variac housing to a well grounded water pipe. This protects the coil 
operator and the control circuits from kickback that may come down the line 
from the step up xfrmr.
         Two 60 cycle cables are run from the variac, through reversed line 
filters, out to the step up xfrmr. No ground connection is made anywhere 
between the 60 cycle cabinet ground and the RF system ground. Hot wires 
only are given to the primary of the step up xfrmr, as well as any gap 
motors or other utility for the coil tank circuit.

*snip*


Another question is where should the Line filter be placed to filter RF 
from the house wiring?  As close to the NST's as possible or should it be 
with your variac and control box.  Depending on where this goes, what 
should it be grounded to (RF or house)?  And why do they say you should run 
this filter backwards?  I think I read on Gary Lau's site that running it 
backwards is wrong.

Thanks in advance everyone for your help!  Hope this isn't too many 
questions in one post!

Jeremy Gassmann