Thanks, but I already looked at that paper. It is decent, but since it
deals with the PVC insulation from one or two vendors I've never heard of,
I'm not sure how widely-applicable it is.

I was hoping that someone here could help me by either:

a) have an example of a product which they designed years ago using PVC
wire which was run at 90C or so for years and could tell me whether they
had problems

or

b) could point me to a app note addressing this from a particular wire
company or even better, point me to an expert who might know how to
determine this.

The problem I have is that there are already a large number of units
installed (they are industrial battery chargers) and we want to increase
the duty cycle from max current for only 2 minutes per 6 minutes to 3
minutes per 4 minutes to support a new battery type. Both situations keep
the wire below its max rated temp but the latter causes the peak and
average temp to be higher than it is presently. The cable vendor is not
being very helpful with determining whether this will be a problem.

Sean



On Mon, Mar 23, 2015 at 2:21 PM, embedded systems <piclist9@gmail.com>
wrote:

> Sean,
> This one may help ?
>
>
> http://www.google.ro/url?sa=3Dt&rct=3Dj&q=3D&esrc=3Ds&source=3Dweb&cd=3D5=
&ved=3D0CDIQFjAE&url=3Dhttp%3A%2F%2Fwww.researchgate.net%2Fprofile%2FMohame=
d_Morsy4%2Fpublication%2F4049794_Thermal_aging_tests_on_XLPE_and_PVC_cable_=
insulation_materials_of_Saudi_Arabia%2Flinks%2F02bfe51030aaf73f5b000000.pdf=
&ei=3DiVgQVczfL4e7UajBg7gK&usg=3DAFQjCNHqNj41Y5DKS9S0pcbrOPJ4B-3ZUw&sig2=3D=
mwnHotCVoVMTCNNVFp5Kug&bvm=3Dbv.88528373,d.d24
>
> On Mon, Mar 23, 2015 at 7:35 PM, Sean Breheny <shb7@cornell.edu> wrote:
>
> > Hi all,
> >
> > I am looking at an application where 105C rated PVC insulated wire may
> > spend several years at 90C. I am trying to find information on whether
> this
> > is feasible (i.e., whether the insulation will still be intact with
> > reliable mechanical and electrical properties like flexibility). My
> initial
> > searches seem to indicate that this is an active research area, which i=
s
> > surprising given that there are surely quite a few power supplies out
> there
> > which run hot and have PVC wire so it would seem like it would be fairl=
y
> > easy to gather data from the real world.
> >
> > Any pointers?
> >
> > Thanks,
> >
> > Sean
> > --
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