Phone wiring

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Jerry the Phone Guy said:
You'd have to define 'properly-made connection' first. But, if we're talking about screw terminals, how many times have you guys opened up a switch or outlet in an old house and been amazed at the dark brown (sometimes green!) that the copper wire has turned to under the screw, that's obviously not gas-tight. It still works for AC (more or less), but with a constant DC voltage on the circuit as in a phone line, it causes static. This is why the so-called 'tip' conductor is actually earth grounded at the central office, to minimize electrolysis of underground cables.
Click to expand...

Jerry,

Sorry, but you are incorrect.

The gas-tight connection in IDC's occurs at the metal, not at the insulation. Here is one easily accesible source with
other links:
http://en.wikipedia.org/wiki/Insulation_displacement_connector

Do you have a source wrt your argument that the
insulation makes a gas-tight connection?

Insulation's purpose is to insulate, not to seal against
gas penetration. If your argument about not stripping insulation were correct,
then connections of any type would not be made with
wirenuts, screw-lugs or other connections including
IDCs which make a gas-tight seal at the connection.
 
rexowner said:
Jerry,

Sorry, but you are incorrect.

The gas-tight connection in IDC's occurs at the metal, not at the insulation. Here is one easily accesible source with
other links:
http://en.wikipedia.org/wiki/Insulation_displacement_connector

Do you have a source wrt your argument that the
insulation makes a gas-tight connection?

Insulation's purpose is to insulate, not to seal against
gas penetration. If your argument about not stripping insulation were correct,
then connections of any type would not be made with
wirenuts, screw-lugs or other connections including
IDCs which make a gas-tight seal at the connection.
Click to expand...

If your source is Wikiepedia couldn't I just change the whole article to support my point of view?:wink:
 
MAK said:
If your source is Wikiepedia couldn't I just change the whole article to support my point of view?:wink:
Click to expand...

I guess so. The original sources footnoted in wikipedia
were 3M and another jellybean source, so I thought it
was credible. I forget who the second one is.

Here is another source:
IDCs work because the "force from the contact
against the relatively soft copper conductor provides
the gas-tight connection by gripping the wire."
. This is quoted from a textbook:
(page 163 of "Connection in Electronic Assemblies",
by Anthony J. Bilotta)
http://books.google.com/books?id=8n...X&oi=book_result&resnum=8&ct=result#PPA163,M1

Unless this textbook writer and every other credible
source I've seen on IDCs are wrong, the insulation
has nothing to do with it, and the metals have everything
to do with it.

WRT the earlier comment on not stripping the insulation -
that's done so wires don't short each other out via
inadvertant contact -- it has nothing to do with making
a gas-tight connection.
 
oops!

oops!

Boy is my face pomegranet?! :mad: But, honestly, I was merely going by what was written about IDC on Mike Sandman's great website for phone installers. Checking back, I can't find that article, perhaps he took it down for a good reason? :D
 
unused power?

unused power?

Yeah, I found this idea intriguing, too, until I realized that if you draw more than about 20 mA, it takes the phone off the hook! (48V @ 20 mills is only about 1 watt.) I suppose if you plugged that into a DC-DC converter, you might be able to step down the voltage and step up the current? And then if you wanted to use the phone, you'd have to unplug the charger or put up with miserable quality. Still, perhaps you could add a circuit which took the charger off the line when the receiver was picked up?
 
i use a 66 block for phones. a nice neat 66 block can look like a work of art. i dont really use bridge clips i just loop the little phone wires. a wire nut works just as well but a 66 block is a much more professional installation. even those little dolphin clips work
 
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