Re: Improved Spectra-Strip Cable -- TPO insulation

[Gerard Visser <gvisser@indiana.edu>]

FYI, here is further exchange with Amphenol on this:
(I attach here both spec documents too).

Hi Brien,
         If the cable will meet the CL2 requirements that is probably enough
info to proceed now. A later safety review of the experiment will
probably have to decide whether we would need to have the formal UL
approval, I don't know what that ruling would be but $6,000 does not
seem like a substantial obstacle.
         I think in order to make an informed decision it would be best if I
could measure the attenuation curve, and the response to our typical
pulse shape, of a sample of 32-3097-994, in comparison to our default
PVC cable. I would need about 30 feet to work with - is this possible?
If not I could think of ways to work with a shorter cable, e.g., send
the same signal back and forth on different pairs of the same cable. But
all such contortions may introduce more uncertainty (from crosstalk and
from impedance discontinuities in the connections) in my results, so I'd
rather have the longer sample.
         The different length between flats shouldn't present much of a 
problem
for attenuation measurements, I think I can still get to a valid conclusion.
         I look forward to hearing from you. Sincerely,

         Gerard

p.s. By the way, would our cable (169-3099-784) still have the flats at
1 m spacing, or will that not be possible? The drawing you supplied, I
just noticed, specified 7.25"...

Brien Devaney wrote:
 > > Gerard,
 > >
 > > This cable would be UL AWM, not CL2. The temperature would be 80C 
and the
 > > voltage rating would be 150C. The cable should meet the CL2 flame test
 > > requirements, but we would need to submit a sample to UL for the 
burn test
 > > and go through the formal approval process at a cost of approx. 
$6000.00.
 > >
 > > We do not have a sample of a 169-3099-784 shielded jacketed TPO 
cable, but
 > > we do have a sample of the inner TPO twisted pairs. It would be our
 > > Opticlear cable part number 320-3097-994, see attached spec. This 
is a 68
 > > conductor which has a different twist length, but uses the same TPO
 > > insulated wires.
 > >
 > > Let me know if you would like to see a sample of the Opticlear 
cable and how
 > > much you would need for testing?
 > >
 > > Regards,
 > >
 > > Brien
 > >

169-3099-784_Rev1.pdf

320-3097-994_RevC.pdf