ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
"Esoteric" countries and their wiring practices?
by Texas_Ranger. 04/20/19 07:00 PM
Norwegian power?
by Texas_Ranger. 04/20/19 06:27 PM
Welded Copper Connections
by gfretwell. 04/19/19 04:46 PM
Israel
by annemarie1. 04/18/19 02:35 PM
Water heater calculationsSo when I count calculati
by watersparkfalls. 04/13/19 12:43 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 2 guests, and 10 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
copper aluminum reaction #48377
02/10/05 02:38 AM
02/10/05 02:38 AM
E
Edward  Offline OP
Member
Joined: Dec 2002
Posts: 308
California
Does copper aluminum reaction occur only when there is current flow? Or regardless of current flow, when you have copper and aluminum touching you wil have current flow.

My main question is can i use regular wire nuts to connect aluminum and copper grounding wires or i need a an aluminum rated wire nut with the antioxidation?

Regards
Edward


Thanks
Edward
Work Gear for Electricians and the Trades
Re: copper aluminum reaction #48378
02/10/05 03:11 AM
02/10/05 03:11 AM
E
e57  Offline
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
With or without current, you still have oxidization due to dis-simular metal contact.

Not getting into the harder physics of it, but an electro-chemical reaction will rot the contact surfaces of the two. Aluminum on its own may do it in certain climates anyway.

And, ya, you need Al/Cu rated wire-nuts.


Mark Heller
"Well - I oughta....." -Jackie Gleason
Re: copper aluminum reaction #48379
02/10/05 05:45 AM
02/10/05 05:45 AM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,260
SI,New Zealand
Edward,
Copper/Aluminium reaction, is caused by dampness, it set's up it's own Galvanic reaction that creates an EMF between the two dissimilar metals, thereby compounding the problem.
In an answer to your second question and in agreement with Mark (e57) use a bi-metallic crimping system, copper one side of a sleeve and Aluminium the other side and make sure you use the proper grease on the Al side.
We swear by them here, and we have some of the most rediculous atmospheres to work in.
(Salt air and the like). [Linked Image]

Re: copper aluminum reaction #48380
02/11/05 03:43 AM
02/11/05 03:43 AM
E
Edward  Offline OP
Member
Joined: Dec 2002
Posts: 308
California
Thanks Gents.


Thanks
Edward

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
MarkC10
MarkC10
CA, Inland Empire
Posts: 43
Joined: September 2013
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
254,509 Are you busy
190,750 Re: Forum
180,468 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.018s Queries: 14 (0.004s) Memory: 0.9595 MB (Peak: 1.0918 MB) Zlib enabled. Server Time: 2019-04-21 10:22:34 UTC