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Re: NST farm
Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>
Hi Ben,
I'm not too sure what the maximum practical number of NSTs
that you can gang together on standard residnetial service would be,
but for a typical 20 amp 120 volt service, that means that the maximum
"volt-amp" rating is 2400 (2.4 kVA). So for 15/30 NSTs (that's 450
volt-amps each) 5 would be the limit there, as far as that goes. However,
you can indeed gang your farm for series-parallel input to paral-
lel output and run it on a 240 volt circuit, so long as you have an
even number of NSTs. If you're looking for a lot of power for a
big coil, though, for say 5 kVA or bigger, then a pole pig is much more
practical (and cheaper too) that a dozen or more NSTs. Plus a
pole pig is darn-near bullet proof in Tesla service, unlike "over-
voltage fragile" NSTs. Many an ameture coiler has fried out their
NST (s) by opening up the spark gap too wide for longer and
longer sparks while running with a near resonant sized primary
capacitor, without a "Terry filter"! (not good) However, the list of
folks that have managed to burn out a pole pig in Tesla ser-
vice is a short one indeed and I would just about imagine that
the ones that were fried happened to be defective and/or the
experimenter was intentionally trying to "fry it" ;^)
So I guess the bottom line is, how big of a coil are you wanting to
build? For anything at or below 2 kVA, I'd opt for the NST or
NST "farm", as a pole pig is really impractically large for power
levels this low. For power levels significantly above 2 or 3 kVA,
you get into pig territory, for practicality.
Just MHO. YMMV.
David Rieben
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, March 21, 2006 1:17 PM
Subject: NST farm
Original poster: ben eells <squeels2171@xxxxxxxxx>
Hi guys, I'd like to know what is the maximum amount of 15kv/30ma
NST's that can be run in parallel? I'd be using standard US 120v. Is
there a point when the current gets to high for reasonable use in a
coil? I'm sure there's a point when my breaker box just can't handle
any more NST's but I don't know how many is too many. I've read in
the archives about being able to power a MOT stack off of 240v if
you have an equal number of them but I didn't understand how to do
it, what the purpose was or if it can be done with NST's. If anybody
has an answer to my question or clarification on the 240v procedure
I'd appreciate it.