surge current of wires

[Frosty_47]

Hello,

I would like to know if there is a chart that lists the maximum surge current of AWG wires. I am close to finishing my 4000 Joule 1600V capacitor defibrillator and would be inconvenienced if the wires explode/melt away.

-Thanks

 

[Chippie]

Hello,
and would be inconvenienced if the wires explode/melt away.

-Thanks

Especially for the patient you are reviving ( sorry I shouldnt laugh its the mischievous mood I'm in atm... )

Err this may help....American Wire Gauge table and AWG Electrical Current Load Limits

 

[Pommie]

OK, I'll go along with the joke. A 1 thousandth of an inch diameter wire will easily carry 4000 joules without exploding or melting away.

Now ask a sensible question.

Mike.

 

[blueroomelectronics]

I wonder how he plans to test it?

 

[user_88]

Another Table ....
http://www.eskimo.com/~billb/tesla/wire1.txt

 

[Chippie]

I wonder how he plans to test it?

Ermmm I aint volunteering as his patient....

 

[Frosty_47]

Ermmm I aint volunteering as his patient....

Why not ? I mean isn't there a hefty prize given to the family of a Darwin Nominee ?

 

[tcmtech]

Do you know the estimated discharge time? A joule is one watt second. If you dump it all in one second that the same as a 14.4 mega watt load at 1600 volts or about 9000 amps for one second.

Two 4/0 welding cables can take that kind of burst. they can hold a continuous duty 1000 amp submerged arc welder without trouble. Even with 20 KA peaks I doubt you would bother them one bit.

 

[Chippie]

Do you know the estimated discharge time? A joule is one watt second. If you dump it all in one second that the same as a 14.4 mega watt load at 1600 volts or about 9000 amps for one second.

Two 4/0 welding cables can take that kind of burst. they can hold a continuous duty 1000 amp submerged arc welder without trouble. Even with 20 KA peaks I doubt you would bother them one bit.

Cor!...some firework display if you shorted the leads...

 

[blueroomelectronics]

Why would you want to build a defibrillator anyway?

 

[Chippie]

Why would you want to build a defibrillator anyway?

OMG....some of you guys crack me up....

 

[Hero999]

I hate meausing cable in AWG or SWG. Cross-sectional area mm² is much easier to understand.

So you're building a defibrillator; how do you plan to spend in getting it approved?

 

[tcmtech]

At 4000 joules and 1600 volts its not a defibrillator. Its a vaporizer!
Still, I would play with it!

 

[Willbe]

Onderdonk vs. Preece

16 gauge copper wire: Tmelt = 1083, Area = 2581 circ mil, Time = 5 sec, Tamb = 25

E= Area in CM
B = Tmelt - Tamb in deg. C
D = 234-Tambient in deg. C
T= time in seconds.
So, E = 2581, B= 1058, D=209, T=5
Then
Ifuse = E* SQRT {<LOG[(B/D)+1]>/(T*33)}
Ifuse = 2581* SQRT {<LOG[(1058/210)+1]>/165}
Ifuse = 2581* SQRT {<LOG(6.04)>/165}
Ifuse = 2581* SQRT {0.781/165}
Ifuse = 2581* SQRT {.00473}
Ifuse = 2581* 0.0688
Ifuse = 178A

 

[smanches]

So that's 178A for 5 seconds to hit the melting temp?

 

[Hero999]

What about the insulation?

The plastic/rubber insulation will burn up long before the conductor vaporises.

 

[Chippie]

Jeez....I have a Tens machine for pain relief and thats enough for me....178Amps...boy you can weld with less than that....