Hello Gregg.
If you disallow the individual strands to go where they need to go
during the crimping process, fractures will occur. Improper
displacement. We all want the best electrical connection we can get. IDC
has solidified (a pun) that statement.

Crimp a contact to a solid wire. Cross section it and tell me what you
see. Fractures within the solid wire. Nowhere for it to go.
Crimp a contact to a stranded wire. Cross section it and tell me what
you see. Proper displacement (as long as the contact and the wire are
within the gauges by design.)The strands are all in the cavities where
they need to be.

Bryon Boone
Technical Training Manager, CIT
Carlisle Interconnect Technologies

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gregg Owens
Sent: Tuesday, May 31, 2011 10:24 AM
To: [log in to unmask]
Subject: [TN] Tinning Stranded Wire - Crimped Connections

Dear Technetters:

I have been posed a question I can't answer. In both the IPC-A-610 and
IPC-A-620 require that stranded wires used for crimp connections NOT be
pre-tinned with solder. Okay I get the requirement, but does anyone know
why this is a requirement. Pre-tinning keeps the strands together, so
there is some push-pack on why this is a requirement. Any thought
appreciated.

Gregg Owens


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