[SI-LIST] Re: Current density of Ribbon Cable
- From: "Adeel Malik" <adeelm@xxxxxxxxxxx>
- To: "'Bill Reams'" <breams@xxxxxxxxxxxxxx>
- Date: Thu, 19 Dec 2002 19:44:46 +0500
Hi Bill,
So what is the typical value of Tproblem (melting insulation) for a
ribbon cable of 28 wire guage ?. Is it about 100 degree celsius or so ?
ADEEL
-----Original Message-----
From: Bill Reams [mailto:breams@xxxxxxxxxxxxxx]
Sent: Thursday, December 19, 2002 7:23 PM
To: adeelm@xxxxxxxxxxx
Subject: RE: [SI-LIST] Current density of Ribbon Cable
When uncertain, I tend to go to the big boys. For wire, I generally hit the
Alpha or Belden catalogs or web sites.
<http://www.alphawire.com/PAGES/383.CFM>
<http://www.alphawire.com/PAGES/379.CFM>
<http://bwcecom.belden.com/catalog/TechInfo/TechLeadWire.htm>
<http://www.madisoncable.com/CableDesign.htm>
Now with all that back ground, I can say that I've watched someone
unsuccessfully try to put more than 1 amp through each of several conductors
in ribbon cable. He didn't believe in the bundle factor derating until
mother nature proved that it was for real. Remember, what you're really
doing is calculating a temperature rise above ambient and want to get Ttotal
= Tambient + Trise which must be less than Tproblem (like melting
insulation)
-----Original Message-----
From: Adeel Malik [mailto:adeelm@xxxxxxxxxxx]
Sent: Thursday, 19 December, 2002 02:23 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Current density of Ribbon Cable
Hi All,
I intend to determine the max. current carrying capacity of
standard 28 AWG ribbon cable. In order to do this in a precise manner, I
must know the following :
1. No of strands in the cable
2. Dia of each strand (This will be used to find the total cross-section
area of the wire)
3. The current density of each strand (This will be used to find the max.
current the cable can support by multiplying it with Area)
Can someone give me the values of the afore-mentioned parameters or guide me
to a link possessing the info I require ?,
Regards,
ADEEL MALIK,
Avaz Networks
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