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Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
radiotech wrote ...
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.
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.
I have participated in a few test on large alternators / generators, for testing purposes of new installations, we used a container the size of a 20 foot container, filled with salt water and 3 huge, huge electrodes could be sunk in / up from a motorized rig.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
The questions being asked suggest that you will still attemp something that will either cause a fire or main/hurt/kill you.
However, if you are still intent on this the suggestion above about using a variac is a good one. Go to Ebay and buy one for $10-$20 fused for 10A. Connect it to your 120V outlet and you can experiment with varying voltages and have it fused. You can also buy a MOT on Ebay and use it in series with the variac to limit the current going in. This way you can limit the current to, say, 5-8A (with the right ballast) and still have the fuse as a failsafe. Maybe someone here could make a recommendation as to what current limits you get with different transformers.
240v is dangerous and will almost definitely kill you if you make a mistake. Both lines are hot.
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Shorting 240v
