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March 2009

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Subject:
From:
"Temkin, Gregg" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Temkin, Gregg
Date:
Wed, 11 Mar 2009 08:23:48 -0700
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Actually too tight a crimp is often the cause of such failures.  The Circular Mil Area of many high count stranded wires is often greater than that of its solid or low strand count equivalent.  Suggest you have them verify they're not over-crimping, and, if their tool is adjustable, see if they can back it off a little.

Gregg

-----Original Message-----
From: Forrester, Michael (H USA) [mailto:[log in to unmask]] 
Sent: Wednesday, March 11, 2009 7:00 AM
To: [log in to unmask]
Subject: [TN] Cable Pull Test specifications

I have a cable vendor that states the following:
 
"Currently have issue with inconsistency of tensile strength of the
crimp using wire ULTRA-FLEX PVC 1251/14 BLACK, due to the flexibility of
this wire item and the large amount of strands, at 1050 strands at
44AWG. After conducting several pull tests found that the breaking
points all ranged from 44lbs to 49 lbs with no consistency. I then
conducted a pull test on a typical 14 AWG, 19 strand wire and the result
was 89 lbs for comparison purposes. Due to not being able to duplicate
the acceptable pull test from previous shipments and considering the
properties of this high stranded and flexible wire we feel it will not
consistently meet the UL 486 standard 14 AWG pull test requirement of
50lbs"
 
     During testing, the cable breaks right at the crimp.  Should the
cable be able to take the 50 lbs even though there are many fine strands
making up the
14 AWG wire?  Is the cable not crimped properly and only the outer
strands are taking the load cusing a "failure".  The vendor is looking
for a deviation to reduce the
pull test requirement to 45 lbs.  Since the Mil-T-7928 spec is 70 lbs
and the UL 486 spec is 50lbs, I'm not sure if the make-up of the wire
(fine strands) really factors in or the vendor needs to crimp tighter on
the cable to add strength?  Any comments would be welcomed.  Thank you.
 
Michael Forrester
Sr. Product Engineer
 
Siemens Healthcare Diagnostics
101 Silvermine Rd.
Brookfield, CT  06804
PH: (203) 740-6452
 

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