The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Correct rotation, wrong sequence
by Potseal
Today at 03:14 PM
Industrail Control Panel bonding per 409.108
by sparkyinak
Yesterday at 06:29 PM
Calling all Non-US members!! (Non-US only)
by aussie240
12/07/16 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 12
HotLine1 10
Potseal 9
sparkyinak 8
Texas_Ranger 7
Who's Online
0 registered (), 198 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Page 1 of 2 1 2 >
Topic Options
Rate This Topic
#66354 - 05/31/06 12:11 AM Question on using aluminum
leespark Offline
Member

Registered: 01/17/04
Posts: 54
Loc: Massachusetts
I am running a 200 amp feeder approx 80' long in 2" EMT. I very rarely use aluminum wire, however with the price of copper skyrocketing I've decided to do so in this situation.

My question is about the equipment ground in the EMT. I would rather run my EG in copper and the hots and neutral in aluminum. I can see no reason why this would be a problem but was wondering if it a poor trade practice for any reason? I guess I would rather use copper when making up ground lugs etc.

Also, how many guys are using aluminum more and what do you think of it. A rep from the aluminum industry was doing some demonstrations in a supply house recently and had some pretty convincing arguments for using aluminum. He showed how the old aluminum conductors were much easier to break after a few bends of the wire and stated that nowhere in the code is the use of deox required. I will still use it though to sleep beter.

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#66355 - 05/31/06 02:33 AM Re: Question on using aluminum
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
No code reason not to mix conductor types.

That said....

If I come across an installation that has mixed conductors I assume someone was using scraps saving a buck etc.

I also generally install copper but would have no problem using an AL EGC with AL circuit conductors.

As far as 'deox' the sales rep is correct, not an NEC requirment. Go ahead and use it if you like. IMO it is of little value.

It comes reinstalled in some crimp connectors my guess it works as both a lube while crushing and keeps water from entering the connector.



[This message has been edited by iwire (edited 05-31-2006).]
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

Top
#66356 - 05/31/06 04:30 AM Re: Question on using aluminum
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
Bob,
 Quote:
As far as 'deox' the sales rep is correct, not an NEC requirment. Go ahead and use it if you like. IMO it is of little value.

Why do you say that it is of little value?
Don
_________________________
Don(resqcapt19)

Top
#66357 - 05/31/06 08:07 AM Re: Question on using aluminum
ExpressQuote Offline
Member

Registered: 04/27/06
Posts: 83
Loc: BC, Canada
I like to work with aluminum wiring for larger cables... It is a little less expensive (especially with the current escalation of copper prices)... It is easier to handle for most applications...

I always use NoAlox or Penetrox when doing my connections, seems to me to just be good practice for a few pennies per connection.

I only use it for large feeder connections like sub panels and such. Wouldn't use it for branch circuits... not because I see anything wrong with it, but I wouldn't want the potential of a home owner playing with connections in aluminum down the road.

IMHO there is nothing wrong with Aluminum for these larger applications.

Glen

Top
#66358 - 05/31/06 02:55 PM Re: Question on using aluminum
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
Don

 Quote:
Why do you say that it is of little value?


I have never seen any documentation that it can do anything. I consider it a snake oil item.

It makes us feel we are going that extra step of craftsmanship without knowing if it does anything.

Other than possible moisture displacement what can it really do to improve a connection?

JMO, Bob
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

Top
#66359 - 05/31/06 02:56 PM Re: Question on using aluminum
LK Offline

Member

Registered: 01/21/03
Posts: 1721
Loc: New Jersey
Make life easy use 2-1/2" also consider a mogal fitting.

[This message has been edited by LK (edited 05-31-2006).]

Top
#66360 - 05/31/06 03:25 PM Re: Question on using aluminum
Ryan_J Offline
Moderator

Registered: 08/19/03
Posts: 1355
Loc: West Jordan, Utah, USA
I don't think I have ever seen anti-oxidant compound used in accordance with the manufacturer's instructions, which typically require the use of a wire brush.
_________________________
Ryan Jackson,
Salt Lake City

Top
#66361 - 05/31/06 03:34 PM Re: Question on using aluminum
LK Offline

Member

Registered: 01/21/03
Posts: 1721
Loc: New Jersey
Good issue, not code, but manufactures requirement.

Top
#66362 - 05/31/06 04:27 PM Re: Question on using aluminum
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6805
Loc: Brick, NJ USA
Lee:
I've been using Al IF it's in the spec, & occasionally for budget reasons. 750kcmil, down to 4/0. As to a ground conductor, Al is not a problem. Personally, I don't like to mix. I've seen #6 Al used for site lighting; had I issue where a 'nick' caused a leg failure in the pipe; not the fault of the conductor material though.

Bob & Don:
As to pentrox (etc) I've been using it for 30+ years! It's what my 'teachers' did, & old habits are hard to break.

John
_________________________
John

Top
#66363 - 05/31/06 04:56 PM Re: Question on using aluminum
e57 Offline
Member

Registered: 05/27/03
Posts: 2837
Loc: S.F.,CA USA
Live near an ocean and one would sing a different tune about no-ox.... Without it AL turns into a block of chalk over time. So much so that all the over-head drop lines here near the beach are copper. Medium voltage too.

It cant hurt..... But I do all the time.
_________________________
Mark Heller
"Well - I oughta....." -Jackie Gleason

Top
Page 1 of 2 1 2 >



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals