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Safe ground hookup

Discussion in 'Electronic Basics' started by notbob, Apr 26, 2012.

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  1. notbob

    notbob Guest

    I wanna mess around with some LOPTs from CRT monitors, but wanted a
    reliable chicken stick (ground hook) to discharge caps, etc, first. I
    bought some 10awg sgl strand wire, a clamp, and a 18" L x 1" dia
    concrete stake. The hardware store had some 10ft long 1/2"-3/4" dia
    copper rod, but wouldn't cut it and 10 ft was waaay too expensive.

    Is this 18" steel (iron?) concrete stake good enough? Will rebar work?
    How long, minimum, for good ground stake?

    nb
     
  2. Jasen Betts

    Jasen Betts Guest

    you don't need a ground stake to discharge capacitors.
     
  3. notbob

    notbob Guest

    Yes, I know. It's why I'm asking advice, which you seem woefully
    lacking. Thanks for nothing.

    nb
     
  4. Tom Biasi

    Tom Biasi Guest

    Not good to discharge large capacitors abruptly. Bleed them them off
    with a resistor connected to clips.
     
  5. Tom Biasi

    Tom Biasi Guest

    Yes, he is working in HV area but I didn't get the impression that the
    caps were HV. If so, you are correct.

    Tom
     
  6. notbob

    notbob Guest

    I once worked at a govt lab assembling and helping test 600KV Marx
    generators. We all gotta lotta HV safety training, as any of those
    60KV caps we used could kill you dead from a spontaneous proximity air
    discharge. I was mostly a mech tech, then, but payed attention.
    Ground hooks were everywhere. In fact, the entire test stand was
    fenced with multiple redundant safety interlocks, tag-outs, etc. So,
    I know what NOT to do.

    What I don't know, and am trying to learn, is how to build up a like
    super-safe HV experimenting environment. I hafta believe I can do
    better than the simple ground wire circuits in my home. I know damn
    well that govt lab test stand wasn't grounded thru the ground plug in
    a 110V wall socket!

    I've noticed some replies mention bleeder circuits, which is good to
    know, but I'm looking for a circuit and grounding specifics that will
    provide an instant safe grounding system for any sized cap or whatever
    I may encounter hacking around with benchtop marx gens, tesla coils,
    flyback gens, etc. I find all kindsa webpages on HV projects like
    jacobs ladder, tesla coils, etc, but none of them mention much about
    safety grounding systems, like it's some sorta inate knowledge
    everyone is born with. I don't think so!

    Yes, I don't know a lot of electical/electronics theory. It is not my
    primary discipline, but I'm having a lotta fun learning about it, now.
    What I do have is a lot of practical experience. From the HV I
    mentioned to setup/tuning of HV RF networks for plasma etching systems
    to troubleshooting circuits through entire $10M plasma etch/dep fab
    equipment. I know how to use a DMM and read a schemo and right now
    I'm assembling my first 4 band SDF radio receiver kit with SMT
    components. Big fun with itty-bitty components! In the pursuit of
    furthering my meagar theory knowledge, I now need specifics and
    information, not criticism telling me what I don't know. Hell, that
    Grand Canyon will never be filled! Anyway, all advice appreciated.
    ;)

    nb
     
  7. Jasen Betts

    Jasen Betts Guest

    start with circuit thory,
    Ohm's law, and Kirchoff's circuit laws.

    An earth terminal is not a magic totem that can protect you from danger,
    once you understand those you'll understand why, you'll also
    understand why you don't need an elaborate earth connection.
     
  8. notbob

    notbob Guest

    Yeah, those whacky scientists building marx generators for that linear
    accelerator didn't really need elaborate grounding. Jes plug that
    600KV ground hook into the GFCI outlet next to the Mr Coffee.

    Sorry, but momma notbob never raised such a foolish child.

    nb
     
  9. notbob

    notbob Guest

    I'm denigrating no one, any more than anyone is actually denigrating
    me ...which I thank this group for. ;)

    Hey, I admit I know waaaay too much, yet way too little, to be as safe
    as I'd like to be. So I'm asking for info. So far, I've gotten ppl
    advising me to learn what I already know. Yet the info on what a
    ground rod is for, how it may/may-not help me, HV dissipation
    specifics, circuits, etc, is pretty much non-forthcoming. If you want
    to argue my skill level, I have no argument. But, if you are not
    gonna help me learn what I would like to know about HV, as opposed to
    what you think I should know, please annoy/attack someone else. ;)

    nb
     
  10. Jasen Betts

    Jasen Betts Guest

    you appeared to be demonstrating ignorance of basic circuit theory.
    sci.electronics is mostly about low-ish voltages,

    You may find what you seek at http://4hv.org/ .
    There was a high voltage forum mentioned here a few months back that
    may have been it.
     
  11. notbob

    notbob Guest

    heh heh... I demonstrate an ignorance of a lotta things in my old age.
    I occasionally drool, too. ;) (say the last 2 words fast, over and
    over ....hey, I think I invented a tongue-twister!)
    Yes, as "...tronics" vs "...cal" would indicate. OTOH, you can't have
    'tronics' w/o the 'cal'. (please, don't go there)
    Thank you for the link.

    nb
     
  12. notbob

    notbob Guest

    OK....

    If you had a 60KV cap and wanted to make sure it wasn't charged, by
    using a ground hook, what would that ground hook be hooked to?

    nb
     
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