Laura,
It's with shivering fingers and shaking knees I dare say against such an
authority like you.
Let me just make a very simplified calculation. Given in that branch: max
voltage = 1 V / series resistance  ( thus also current limitation) = 1 MOhm.
Max Pd = U2/R = 1/10exp6 = 1 uW.  Not enough to char epoxy.  Sorry for
being obstinate. If I am wrong and be corrected by you, it is a honor.
I enjoy hearing from you. One of the very first American reports I read as
newbe in soldering was written by you.

Inge


On 20 September 2013 14:34, Laura J Turbini <[log in to unmask]> wrote:

> Inge,
> I disagree.  CAF is a conductive filament which grows from the anode to the
> cathode.  It's growth rate is related to the voltage gradient, so in a low
> voltage circuit you may never create CAF.  When you do create CAF and it
> bridges the anode and the cathode, electrons flow rapidly heating up the
> laminate causing it to char.
> Laura
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord
> Sent: September-20-13 1:57 PM
> To: [log in to unmask]
> Subject: Re: [TN] CAF, between a signal pint and ground
>
> Because you got two 'YES' I say 'NO'.  (I can see many rise eyebrows. What
> will happen now? The question was 'can there be exothermic damage?'. My
> njet
> is based on a special condition, which you may have or not have, namely the
> impedance of the pathway. Some circuits can have 1. Extremely low voltage
> 2. Very high resistivity. Such a combination will not produce enough energy
> to start a exothermic issue. Just a footnote.
>
> Inge
>
>
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