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To solder or not to solder - This is the question

Discussion in 'Hobby Electronics' started by JERD, Nov 14, 2007.

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  1. JERD

    JERD Guest

    I need to terminate two 50 amp cables in a large terminal strip. There is
    one line of thinking that if the cables are soldered before terminating,
    over time the solder 'gives' making a possible loose connection.

    I have no option to using a terminal strip.

    Any definitive answer to this one?

    JERD
     
  2. Phil Allison

    Phil Allison Guest

    "JERD" <

    ** Yep - you use a plated copper "ferrule" and crush it on the end of the
    cable with a crimping tool.

    Then poke it in the hole and screw it down with two ( or more) hefty grub
    screws.

    Solder is out of the question.

    BTW

    What ginormous iron were you expecting to use on a 20+ sq mm copper cable
    ?



    ....... Phil
     
  3. JERD

    JERD Guest

    TNX your reply.
    A BIG one Phil

    JERD
     
  4. max

    max Guest

    "crush" is very much the wrong word !!!!!

    These need to be crimped on correctly, too much crimp and the cable will
    go hard and break, too loose and it will over heat with the current

    MAYBE if you can't crimp correctly, hard solder, maybe.

    Max
     
  5. Terryc

    Terryc Guest

    A few waves ofthe lpg torch should suffice {:).
     
  6. The Australian Electrical regulations prohibit soldered connections
    unless it's for earth bonding. (From what I recall).

    Dorf
     
  7. JERD

    JERD Guest

    Should have said in my original posting this is a 12 volt application.

    JERD
     
  8. I suspected as such. There's still a lot of wisdom in the regulations.
    Soldering is more likely to cause problems in a high current situation
    than a high voltage one.

    Dorf
     
  9. Phil Allison

    Phil Allison Guest

    "Terryc"

    ** Oh yeah - what happens to the PVC covering ??

    Anyone for toasted, melted plastic ?





    ..... Phil
     
  10. ian field

    ian field Guest

    Could be welding cable with heat proof cover.
     
  11. Terryc

    Terryc Guest

    If you think that is bad, you should see what happens when you use the
    oxy torch {:).

    You are spot on Phil, but I've seen that done with a soldering iron as
    well by someone who claimed they did know how to solder. 25 pin plug
    with every wire bare for 1" back from the plug. Shudder.

    Adfter that experience, I inadvertently asked an old plumber "can you
    solder". After all he and all the other old guys stopped laughing, he
    said "not the type you need".

    I was trolling a bit there Phil.
     
  12. Phil Allison

    Phil Allison Guest

    "Ted"

    ** IME that idea works just fine:

    You are NOT relying on solder to hold copper wires together that are being
    crushed apart by a clamp or grub screw.

    You ARE making the termination more reliable by using solder to conduct
    the current flow from the surface of the crimp lug to the surfaces of the
    ( otherwise) bare copper strands.

    Keeps out moisture and prevent tarnishing & corrosion too.



    ....... Phil
     
  13. ian field

    ian field Guest

    Years ago I worked at a welding gear makers, the usual way was crimp then
    run solder in. There was a fairly high failure rate as capillary action drew
    solder past the crimp and made the wire "ankle" brittle - this suited the
    company just fine, selling replacement cables at extortionate prices.
     
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