At 15.23 2011.09.13, you wrote:
>On 13/09/2011 13:53, Electron wrote:
>> Hi!
>> can a 1 mm2 conductor carry thousands of amperes for very short=20
>times? (uS or less)
>>
>> I mean, is there an intrinsic limit, other than temperature (which=20
>for pulsed operation
>> if the average is low, should not pose problems) and of course Joule=20
>effect (I^2*R)?
>>
>> Greets,
>> Mario
>>
>Skin effect, capacitance and inductance.
>
>So length of cable, placement, return wire and voltage are all=20
>significant too.
>
>Even a not very long wire will limit current of 1uS pulses due to=20
>inductance and Skin effect.
>
>It's the I^2^R that melts or evaporates  the wire. Easier the shorter it=20
>is, assuming supply wires are much larger.

But the tables I see that report wire size with max current are calculated
mostly due to the Joule effect, right? Can I safely assume higher currents
for very short periods? Ok, not thousands times higher.. but maybe ten time=
s
perhaps?

--=20
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