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Forums
4hv.org :: Forums :: High Voltage
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MOT ballast..

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Zyrppa
Fri Mar 30 2007, 03:14PM
Zyrppa Registered Member #609 Joined: Wed Mar 28 2007, 04:18PM
Location: Muurame, Finland
Posts: 6
Do i connect hv ground(mot's core) to ground wire witch comes from power cord? Or do i left HV to "float"?
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sparky
Fri Mar 30 2007, 08:31PM
sparky Registered Member #530 Joined: Sat Feb 17 2007, 07:56AM
Location: Victoria BC, Canada
Posts: 178
Resistive load - current limiting is not ideal. I'd use a 0.9uF 2200V rated MO capacitor. These are used as an inductive/capacitive load ~ also used for DC rectification to 4kVDC-5kVDC. MO caps are definitely the way to go.

MOTs are core grounded - so the green wire would attach to the MOT base - the high voltage comes from the secondary.
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Myke
Sat Mar 31 2007, 01:53AM
Myke Registered Member #540 Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
I don't think you should connect the core to gnd cause it will increase the chance of getting zaped. just leave it floating.
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ragnar
Sat Mar 31 2007, 05:21AM
ragnar Registered Member #63 Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
I completely disagree, if you leave the core floating, it could become live. If you ground it properly, you'll not get shocks from touching it if the secondary arcs to it.

In this case, ground the core.
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sparky
Sat Mar 31 2007, 08:33AM
sparky Registered Member #530 Joined: Sat Feb 17 2007, 07:56AM
Location: Victoria BC, Canada
Posts: 178
ALWAY GROUND THE CORE!!
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Zyrppa
Sat Mar 31 2007, 01:26PM
Zyrppa Registered Member #609 Joined: Wed Mar 28 2007, 04:18PM
Location: Muurame, Finland
Posts: 6
Thank you. I just had to be sure about that.
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Steve Conner
Sat Mar 31 2007, 06:58PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
For goodness' sake. You shouldn't be touching any part of your power supply while you're running a coil. I prefer to ground MOT cores anyway, but not for safety reasons.
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Myke
Sat Mar 31 2007, 08:54PM
Myke Registered Member #540 Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
Ok sorry. I thought it would be safer not grounding the core. I'm not touching the HV output it is just that I thought if you brushed accidentally up against the HV you wont get zaped from being part of the ground or near the ground.
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Zyrppa
Sun Apr 22 2007, 04:09PM
Zyrppa Registered Member #609 Joined: Wed Mar 28 2007, 04:18PM
Location: Muurame, Finland
Posts: 6
Would this work as ballast on primary side?
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Michael W.
Sun Apr 22 2007, 05:29PM
Michael W. Registered Member #50 Joined: Thu Feb 09 2006, 04:07AM
Location: Vernon, B.C, Canada
Posts: 324
I think thats an EMI Filter, and If I'm right the answer is no, it won't ballast.....
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