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Old 03-11-2008, 08:01 PM   #1
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AL Wire


Just wondering something. Do you HAVE to use the anti-oxidize gel (whatever you call it) on Al wires when connecting it into panels etc.?? Some say that you must others have no opinion??

Mike

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Old 03-11-2008, 09:13 PM   #2
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yes otherwise it will oxidize and you will get a bad connection if i'm not mistaken possibly leading to a fire due to the connectiong getting hot.


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Old 03-11-2008, 09:42 PM   #3
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This is true, but it is not in the code book.

I think "110.11 Deteriorating Agents" would be the closest thing, but this is not nearly specific.
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Old 03-11-2008, 09:43 PM   #4
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Ill add sum just the same. Just be my luck something will happen!


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Old 03-11-2008, 09:47 PM   #5
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Absolutely. It's not worth not doing. Does that make sense?
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Old 03-11-2008, 09:53 PM   #6
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AL Wire


yeah actually it dores 100%. Could have told the guy who wired up my feedes that it takes just as much time to do it wrong as it does to do it right.

Ill be adding some when I wire up my garage unit. As well adding some to the feeders to my house that HE SHOULD have done.

Is this stuff clear? Maybe he added some that I don't see? Dont really know what Im looking for though
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Old 03-11-2008, 10:02 PM   #7
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Quote:
Originally Posted by mr500 View Post
Is this stuff clear? Maybe he added some that I don't see? Dont really know what Im looking for though
Not typically.
Usually it is a grey paste. Like the consistency of smooth peanut butter.

I do have some new clear blue stuff my supply guy gave me to try, but I have not seen anyone else using it yet.
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Old 03-11-2008, 10:29 PM   #8
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ok sounds good. thanks for all advice

Mike
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Old 03-11-2008, 11:10 PM   #9
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Another thing it does is sort of lubricate the end of the setscrew where it presses the wire. This allows for a much tighter connection, and doesn't gall up the wire where the setscrew turns on it.

One of the main problems with AL wire is 'cold flow'. Any setscrew AL connection will loosen up in time, even with no current on it. Aluminum is a soft metal, and pressure on it will make it move, even if it never heats up.

Another problem is 'spot heating'. This is usually not much of an issue on a house feeder, but it a big problem on a motor feeder. The starting surge current of a motor will cause the termination to heat up quickly, and thermal expansion will cause the connection to loosen. Anti-oxidant compound helps this alot by distributing the heat over a larger area, thus limiting spot-heating.

When making a termination with AL wire, wiggle the wire as you are tightening it, you'll get another half-turn or so out of the setscrew. A much tighter connection.

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Old 03-11-2008, 11:19 PM   #10
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ok well do that as well..working with 2-2-4-6 so hopefully it wont be that bad. Thanks 4 all advice!!!

Mike

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