Jointing underground solid core twisted pair cables

[dr pepper]

I want to run Rs485 over a moderate distance, I've done this before using twisted pair solid core as I can get a good price.
Last time I welded the wires, first twisting them then melting the end into a blob with oxy acetylene, then stuffing the joint into a potting box with epoxy.
I dont have the gas to weld them anymore, I see telecomms engineers use crimp terminals, is this the way to go?

 

[barry]

if Telecom engineers do it, why shouldn’t you? I would just be concerned about corrosion and impedance mismatch.

 

[dr pepper]

I've had crimps corrode before.
I guess there are different crimps.

 

[KlausST]

Hi,

Why welding? In electronics we use soldering.

A shrink tube, or shrink tube with hot melt glue inside to protect it against corrosion.

*****
There are special crimps for underground joining.
Good crimps with high force generate a oxygen free cold welded joint.
There are also mor simple crimps that have grease inside to protect the joint against humidity.

I guess an internet search gives many fast and good results.

Klaus

 

[dr pepper]

Cos I have oxy acetylene on my van, not much more difficult than a gas solder iron to get out.

OK I'll see if I can get some of those crimps.
I think I've seen thos terminals with the sticky goop inside.

 

[KlausST]

Hi,

internet search "underground telecom splice connectors"

Klaus

 

[dr pepper]

Found some dealies that are much like torpedo joints on armoured cables, only smaller.

 

[rogerryan]

Hi,

Why welding? In electronics we use soldering.

A shrink tube, or shrink tube with hot melt glue inside to protect it against corrosion.

*****
There are special crimps for underground joining.
Good crimps with high force generate a oxygen free cold welded joint.
There are also mor simple crimps that have grease inside to protect the joint against humidity.

I guess an internet search gives many fast and good results.

Klaus

we use soldering rather than welding because of thin wire flexible metal like silver wire, welding can damage the copper circuit.