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Tool Talk Discussion Forum

Electrical connection

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Iowan

12-22-2003 18:12:58




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For 40 years I have had trouble with copper to aluminum connections shorting out. Is there any thing that I can co to prevent the corrosion between these two metals? Is there a spray or white grease substance that would prevent this shorting out of the connection? I know there are electricans out there that have had the same problem.




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Farmered

12-26-2003 02:53:32




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 Re: Electrical connection in reply to Iowan, 12-22-2003 18:12:58  
I think you mean that you have an "open" not a "short". An open is an incomplete circuit. A short is when the circuit is complete to ground or another circuit. Ed



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Bill-KCKs

12-23-2003 20:14:39




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 Re: Electrical connection in reply to Iowan, 12-22-2003 18:12:58  
I'll add one more type of connection that is becoming more common on service entrance cables. Ampact connectors are "shot" on with an Ampact gun and a powder charge. Might be able to find an Ampact gun at a rental yard.

Bill
KCKS



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By the way-----

12-23-2003 17:41:00




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 Re: Electrical connection in reply to Iowan, 12-22-2003 18:12:58  
How did the chainsaw work digging the trench for the wires?



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Bill

12-23-2003 09:03:58




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 Re: Electrical connection in reply to Iowan, 12-22-2003 18:12:58  
You didn't say if this entrance wire for 220 volts. If it is there is two ways of handling this problem. One the best way. There is a special crimp made to go from alum to copper. It looks like an H, one hole for the alum and one for the copper. Another is a butt connecter alum in one end and copper in the other end. Both will have the dielectric grease in them and both have to be crimped. The crimpers cast $600 to $700, kind of expensive if you only use them once.
The other way is split bolt. It is alum material for alum and copper (al/cu), it has a small bar that goes between the alum and copper. You will need the dielectric grease (nolox). Then tape real good with electrical tape.

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iceman

12-24-2003 05:57:31




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 Re: Re: Electrical connection in reply to Bill, 12-23-2003 09:03:58  
not picking nits,but dielectric paste is an insulator(look it up), used on hi voltage connections to prevent arcing.The various "no-corrode" products are are made for CU to AL connections...mike



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Ben in KY

12-23-2003 08:40:00




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 Re: Electrical connection in reply to Iowan, 12-22-2003 18:12:58  
I use NOLOX grease on my battery terminals in everything I own. Works wonderfully. No dirty or corroded connections :)



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Jerry Bliler

12-23-2003 08:28:45




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 Re: Electrical connection in reply to Iowan, 12-22-2003 18:12:58  
Want to pass this along. you all need to try this stuff on auto battery connections. It works great and really stops termanal corrosion. also is a way to use up the tube of paste over the next ten years.



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John K

12-23-2003 06:21:46




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 Re: Electrical connection in reply to Iowan, 12-22-2003 18:12:58  
You can use Nolox or Penetrox, I preffer the one that is a gray past, I believe it is Penetrox. Before applying, clean the wires either by scraping on bigger wires or by using a scotch bright pad on small wires. I also use Penetrox in the electrical trade for a corrosion inhibitor for aluminum threads on pipe or into boxes to help prevent gualling.



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MapleStone

12-23-2003 05:59:32




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 Re: Electrical connection in reply to Iowan, 12-22-2003 18:12:58  
What the guys below have told you is very correct however I do want to mention one thing.

When you apply the Noalox/Penatrox or what ever you should brush it into the aluminum with a stainless steel wire brush.

What this does is remove any existing aluminum oxide that is already on the wire and allows the compound (Noalox) to come in contact with bare aluminum. And you have to use a stainless brush to prevent an aluminum vs steel reaction.

I believe this procedure is recommended on the bottle/tube of Noalox but a lot of people don't do it. It is not real critical to do it but for the couple of extra minutes it will take, I would.

Hope this helped.

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buickanddeere

12-23-2003 10:55:09




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 Re: Re: Electrical connection in reply to MapleStone, 12-23-2003 05:59:32  
Amen Maplestone. May I add that wall receptacles and switches etc must be aluminium compatable or you will smell smoke. Or a pig tail al to cu before terminating. usually get the junction box overfilled with wire and connectors however.



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Iowan

12-23-2003 05:05:01




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 Re: Electrical connection in reply to Iowan, 12-22-2003 18:12:58  
The connection is on the entrance cable, large aluminun wire to large copper wire, leading to fuse boxes of course on the inside.

Thanks for all the replies, I have never heard of the paste, but I am headed to town to get some.



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Shannon

12-22-2003 23:24:18




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 Re: Electrical connection in reply to Iowan, 12-22-2003 18:12:58  
It is a greaselike substance called noalox or nolox for aluminum to copper connections electrical supply firms usually carry it(tube or bottle w-brush),works pretty good. make sure connections are real clean and tight..



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Jake

12-22-2003 21:01:43




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 Re: Electrical connection in reply to Iowan, 12-22-2003 18:12:58  
Is this on 120-240 volt wiring in your house or shop or barn? Aluminum wiring has been phased out and outlawed for 120 volt circuits for that very reason. Get rid of it if you still have it.
Aluminum is still used on the large wires from the power pole to the service entrance box. There are special connectors to be used and special procedures and that oxide/corrosion preventing stuff mentioned by the other posters. Might be best to consult your local electrician before you have a fire.

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Bob

12-22-2003 20:11:18




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 Re: Electrical connection in reply to Iowan, 12-22-2003 18:12:58  
I assume you actually mean the connections are oxidizing, or overheating and burning off, rather than "shorting out".

Are the connections exposed (such as in a fuse box or junction box), or are they buried?

If they are exposed, use a no-corrode paste approved for this use, and KEEP THE CONNECTIONS TIGHT!

If they are buried, use approved connectors and insulators. The connectors will have paste in them.

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bob

12-22-2003 18:37:22




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 Re: Electrical connection in reply to Iowan, 12-22-2003 18:12:58  
If you are connecting smaller wires such as 14,12 or 10 there are special wirenuts designed for this.They are available at electrical supply houses,they are rather pricey though.If you have larger wires use aluminum split bolts.Be sure to put the spacer between the copper and aluminum.YOU can coat the wires with penetrox or noalox,an anti oxidizing agent.



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arthur

12-22-2003 18:28:00




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 Re: Electrical connection in reply to Iowan, 12-22-2003 18:12:58  

yes thereis a type of grease to stop the crosive action caller pennatrox (spelling ? ) goto a electrial supply house or check with a electrian . even if you see the power co. repairing lines check with them might have a small amount that he dosent need.



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