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4hv.org :: Forums :: General Science and Electronics
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Shorting 240v

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Platinum
Wed Nov 02 2011, 05:37PM Print
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
How can I short circuit 240v mains without blowing fuses and circuit breaker tripping?
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Thomas W
Wed Nov 02 2011, 05:47PM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
use a inductor or transformer in series with it ;D
isolation transformers are good too
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Platinum
Wed Nov 02 2011, 05:53PM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
I don't have an isolation transformer.

In my mind I'm thinking a plug with a 13A max? fuse and the two leads to short through a few things, how big does the inductor have to be? Could I get one out of something I have like a PC psu or something.

Thanks :)

I know this is simple, but this is what I was thinking

Sqlyj

Moderator edit: Maximum 400 pixels width pictures!

Sorry, I'm not very experienced with mains, but I did complete my monster flyback driver today :)
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Experimentonomen
Wed Nov 02 2011, 06:08PM
Experimentonomen Registered Member #941 Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
Fluoro ballasts, combine them in seris and/or parallel for desired current. See photonicinduction's big boys power supply.
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Platinum
Wed Nov 02 2011, 06:29PM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
Can I use anything from old TV's or power supply or anything?
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Mads Barnkob
Wed Nov 02 2011, 06:57PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
I don't mind destruction, but this thread is on the edge of getting removed due to lack of insight and that you are clearly lacking knowledge of what you are doing.

Mains voltage is dangerous and I suggest that you find a safer way to destroy things, get this thread back on a safer track and have fun.

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Platinum
Wed Nov 02 2011, 07:04PM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
Well what can I ballast it with?

I've cooked things with high voltage from a flyback, but I want to try mains, can you help?

If the thread gets closed I'll use a bare mains plug, that will work at the dispense of a fuse.
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Patrick
Wed Nov 02 2011, 07:23PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
You need to limit the current Platinum , so a MOT used as a ballast would do what you want. But i very worried your reaching beyond your knowledge and experience.

A plug does not in anyway limit current, that rating is merely what the plug can handle. Im fearful you may be hurt or killed.
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Platinum
Wed Nov 02 2011, 07:31PM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
Well I just thought to myself, I will not do it, but it seems all you have to do is use a big inductor like a MOT (as you said) and short the other winding, and it's good, or you can use a big extension lead.
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radiotech
Wed Nov 02 2011, 08:03PM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
The method of shorting 240 volts without tripping the breaker is to draw a
current which has been limited to some value (i.e 20 amps) that you wish to
use as a test to determine the voltage drop at the outlet at that load. There are
hand-held instruments that do that easily, and log the data.

Their use is in inspection of circuits to see if they meet code.

The trick here is the current reading is taken fast enough to fall between
the peak value that the breaker & system can furnish without tripping
the breaker. Here is a small one for 120 volts. Link2

It is not recommended you do this unless the consequences are within
your control.

I was once told that acceptance tests of alternators involved crowbarring them.
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