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!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Parking lot pole light swap....
by gfretwell
10/24/16 08:46 PM
International Wire Colour Codes
by Tjia1981
10/23/16 12:08 PM
Son of Sparky
by HotLine1
10/20/16 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 14
HotLine1 7
ghost307 7
renosteinke 6
Potseal 4
Who's Online
1 registered (jraef), 135 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#181825 - 11/02/08 08:24 AM annondized copper
watersparkfalls Offline

Registered: 03/08/05
Posts: 210
Loc: Washington...Not DC
Is annondized copper properties the same as copper?
I only ask because a friend pulled an additional set of parralell feeders before they realized that the existing sets of feeders were(they thouht alum at first)annondized copper. Since parralell runs are important to be exact(length,insulation,metal ect...)to insure current flows through each conductor evenly to avoid overheating on them.


2014 / 2011 NEC & Related Books and Study Guides
#181831 - 11/02/08 11:27 AM Re: annondized copper [Re: watersparkfalls]
renosteinke Offline
Cat Servant

Registered: 01/22/05
Posts: 5305
Loc: Blue Collar Country
Aluminum is anodized; copper is not. Aluminum wire is never anodized - that would be a high resistance connection, but it might be copper coated.

Copper wire MIGHT have tinned condustors; these will have a silvery appearance.

I would treat tinned copper the same as plain copper.

#181844 - 11/03/08 08:59 AM Re: annondized copper [Re: renosteinke]
mikesh Offline

Registered: 06/07/06
Posts: 614
Loc: Victoria, BC, Canada
Anode (izing) is the electric fusion of aluminum oxide to aluminum to protect against uncontroled aluminum oxidization and because the anodizing is also harder than the underlying aluminum it also protects the part from wear too. It can be dyed too. Anodizing increases electrical resistance and is not used in wire.
The electrical process dips an aluminu part in an acid solution with suspended aluminum oxide in the solution. the part is connected as the anode and the tank as the cathode. and electricity causes the oxide to deposit on the aluminum. Electroplating is done in a similar manner.

#181860 - 11/04/08 03:08 PM Re: annondized copper [Re: mikesh]
Tom Offline

Registered: 01/01/01
Posts: 1069
Loc: Shinnston, WV USA
If that feeder is really old, it could be tin plated copper. The tin plating was put on to prevent a reaction between the copper and the rubber insulation. Though usualy silver in appearance, sI've seen it look slightly yellow or gold.

Edited by Tom (11/04/08 03:09 PM)
Few things are harder to put up with than the annoyance of a good example.


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