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Re: MOTs in series

They are designed for 2 kV insulation levels.  You can run 2 in series, but more than this they have to be immersed in oil or they will arc over to the core as the series voltage adds, ie, 2 kV x 4 = 4 kV   add another 2 kV in series to get to 6 kV but it will flash over in air.
Yes, in my dual MOT design coil (7.5 ft output spark) we run each MOT at up to 18 Amps off separate 120 VAC circuits.  By keeping each circuit under 20 Amps you avoid tripping breakers.
The coil is presently a "work in progress".  Hope to be finished with it in Feb.
Dr. Resonance
----- Original Message -----
From: Tesla list
To: tesla@xxxxxxxxxx
Sent: Tuesday, January 02, 2007 8:25 PM
Subject: MOTs in series


This is probably a stupid question, but I was wondering what exactly the problem with having several MOTs in series is.  The web sites that I have found that discuss this topic all say that the problem is that the insulation on the secondary isn't sufficient to prevent arcing to the core, but what if the core is at high voltage as well?  Like, if the secondaries were strung together, with the hv output of one secondary attached to the core of the next MOT?  I think that each MOT would not have a potential difference from the secondary to the core of more than the original rating for a single MOT, and since the primaries are electrically isolated from the high voltage across the secondaries, arcing to them shouldn't be a problem, unless maybe something on the secondary was grounded.  Is this correct?
Also, I was wondering if you could parallel the primaries instead of connecting them in series, so that different MOTs could be connected to different outlets/circuits/breakers (assuming they were all in-phase).

Thanks a lot,