Re: grounding NST's

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Mddeming@xxxxxxx 

Another thing to consider during a flashover that the green wire is 
packing a large amount of RF energy, making it, and all green wires 
attached to it, into a large antenna array which will 
radiate/couple  into every nearby wire and piece of equipment. In an 
apartment building, everyone's wiring becomes part of the antenna 
array even if for only a few milliseconds. Under the right 
combination of circumstances, "nearby" could include the houses next 
door or further down the street.
     When doing a risk/benefit analysis of which way to go, one must 
consider the cost of regaining good will once it has been turned to 
animosity. Zapped equipment and/or an irate neighbor can cause far 
more trouble than any increased effort in grounding. Like skydiving, 
it only takes one major oops to give you a VERY bad day.
    Of course, one can take the position of the coal mine operators 
around here in WV, "Nothing is wrong UNTIL something goes wrong, and 
then, only IF they can pin it on you." You choose.


Matt D.




In a message dated 3/22/06 1:39:44 P.M. Eastern Standard Time, 
tesla@xxxxxxxxxx writes:
Original poster: dest <dest@xxxxxxxxxxxxx>

Hallo.

> Original poster: Steve Conner <steve@xxxxxxxxxxxx>

> Personally I believe that grounding a NST to RF ground is a bad-ish
> idea. The reason is that the incoming line voltage powering the NST
> is referred to green wire ground. Therefore, any RF voltage appering
> on the RF ground will also appear between the NST primary winding and
> the core, which might cause flashovers.

ok - let`s asssume that you have grounded your psu to the green wire,
then when your primary is being zapped, you can get for example 2kv on
this wire, and since rf current would flow only thru this wire and not
thru hot or neutral wire you`ll have now 2kv between the green and hot
one, as well as between green and neutral, coz as you said above "line
voltage powering the NST is referred to green wire ground".
so you are guaranteed to have hv in your home wiring - even without
breakdown of any psu insulation - just by your design.
do you like this situation?
do you like it much more than stressing pri-core insulation - probably
you like to stress home wiring insulation instead?
if so - can you tell me why (or where i`m wrong)?

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