On Fri, 10 Feb 2006 12:50:22 -0800, "Phil Scott"
Gave us:


"not i" wrote in message
.. .
On Thu, 02 Feb 2006 22:56:25 GMT, "Toller"
wrote:


"Roy L. Fuchs" wrote in
message
...
On Thu, 02 Feb 2006 11:55:00 -0600, Bud--

Gave us:

The question I asked was for a single tinned stranded wire
in a pressure
connection.


Stranded wire in a pressure connection cannot be
soldered.

I am not doubting you, but can you give a reference for
that?
(I always crimp fitting on stranded, but was unaware of this
prohibition...)




This is from The Canadian Electrical Code Rule 12-112
Conductor
joints and splices
(1) Unless made with solderless wire connectors,joints or
spices in
insulated conductors shall be soldered, but they shall first
be made
mechanically and electrically secure.


Rule 12-116 Termination of conductors
(1) The portion of stranded conductors to be held by
wire-binding
terminals or solderless wire connectors shall have the
strands
confined so that there will be no stray strands to cause
either
short-circuits or grounds.




My Interpretation : Solder could be used to confine the
strands!


Not only correct but the only way to go in many cases... it
seems most on the NG are house wiring guys and applying NEC as
they see it in homes etc...but not of course in the industrial
markets.


What a silly thing to say.
.
In corrosive environments, stranded wire will corrode into the
crimmped terminal and around the wire, insulating the wire
from the terminal slightly causing it to burn, then fail..
thats common.

Not true. In corrosive environments (like your marine scenario)
standard non-gas tight connectors are not spec'd. If they are used,
they will corrode. A gas tight connector must be used, and that too,
would NOT require any solder.

Accordingly battery cable manufacturers most often solder
their wire into the crimped terminal ends.

The huge crimped terminal on a commercial battery cable is NOT a gsa
tight termination. What does get used gets soldered because that is
the only way they can give the termination SOME life span.


This practice is seen pervasively in marine environments on
both low amperage control circuits, and on power circuits.

Yet not seen in ANY marine environment where the proper fittings are
used. Most consumer level crap won't have such overtly expensive
hardware in it, hence the "workaround", with solder.

Use of solder on power circuit terminals however has many
problems, namely the solder melting out of the joint if the
wire warms too much...

If the wire warms to the melt point temperature of solder, then
there is a much larger underlying problem with the circuit or the
wiring design. NO circuit wiring should EVER rise to that temperature
in ANY non fault mode of operation. EVER.

and extrusion of the solder under
compressive stress if screw connectors are used..

It is not referred to as extrusion, it is called CREEP.

the military
specs some are referring to cover that aspect... but not the
other aspects.

The military were the inventors of the gas tight crimped connection.

Use of solder in an already crimped terminal serves to
increase the electrical contact area, thats good, and to
preclude corrosive gases, vapors and oils from the joint (by
wicking up the bare wire).... that is seen commonly be the
cause of failure in those situations.

If the connection is gas tight, it will be vapor and liquid tight as
well. If it is not made using gas tight methods, then it is open to a
host of problems. Many of which solder still does not fix or address.

For the last 100 years... and currently.... most if not all
controls systems and component manufacturers dip wire ends in
solder that are to be fit under screw head connectors... the
practice is at least 90% common.... thats with *control
circuits.

It varies from product producer to product producer as some of them
conform tightly to proper manufacturing specs and some do not.
That doesn't make those that do not "most if not all".

The practice is not common with power circuits for the reasons
mentioned but is still seen in some situations (primarily
corrosive environments... anyone can purchase NEC approved
soldered connectors of course for those purposes... those are
also pervasively common, especially in the electronics
industry.)

None of those will be crimp style connectors. It is either a solder
terminal or a crimp terminal... not both.