Hi JF,

I won't go so far to say the practice is evil, but you should never tin 
stranded wire that goes into a screw terminal. Over time you will get solder 
creep or cold flow, the connection will loosen and create high resistance, 
and possibly cause a fire hazard. Crimped Ferrules keep the strands neatly 
together and offer a much better long term connection, but that does add 
cost and labor.

Solid wire is less flexible than stranded wire and doesn't carry as much 
current...

Steve

-----Original Message----- 
From: JF
Sent: Tuesday, December 11, 2012 2:31 PM
To: [log in to unmask]
Subject: [TN] To tin or not to tin!

Hello Technetters,

We are wondering if it is a good or evil practice to tin the wires that
will be inserted in terminal blocks such as ETB74.

On numerous occasions, I've seen these connections loosen and/or the
stranded wires damaged by applying torque to the connection. In a
previous live, I've seen tined wires that seem to work fine but never
had the chance to see long term effect of tinning.

So the question: to tin or not to tin? Should ferrules always be used?
Is it better to use solid wires as opposed to stranded wires?

Thank you!

JF

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