ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Switched Receptacles -Top or Bottom?
by gfretwell - 07/28/21 10:06 PM
Lowes Selling this fan
by timmp - 07/25/21 10:58 PM
How's all our Non-US folks doing?
by djk - 07/23/21 09:13 PM
Do You Travel?
by Bill Addiss - 07/20/21 04:26 PM
Backup Generator Done Right
by timmp - 07/18/21 12:20 PM
New in the Gallery:
February, North East Indiana
February, North East Indiana
by timmp, July 25
Red Green would be proud
Red Green would be proud
by timmp, July 25
Who's Online Now
0 members (), 15 guests, and 15 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Oct 2000
Posts: 3,661
Likes: 1
Admin Offline OP
Administrator
Member
Quote
Here are pics from a panel I had to work on.... Something tells me I'm not supposed to have to bend over the dryer sideways to make repairs here...

A loose B phase was causing flickering lighting.... (I didnt think the lugs were painted 2 different colors on purpose! [Linked Image] ) The #4 aluminum conductor loosened the terminal over time & thus got a bit toasty.. Finding this time & time again is the reason I won't use aluminum wire.... Period!

-Randy (aka Lostazhell)
[Linked Image]

[Linked Image]

[Linked Image]

Joined: Jun 2003
Posts: 1,143
D
Member
When I replaced a service a few months ago, I got enough Cu to make the run from the meter box to the panel, just in case.

When I opened everything up, the old entrance (60A) was Al, when they upgraded a few years ago, they re-used it, and ran Cu for the other leg. I stripped out the Al (It was too short for the new panel...darn [Linked Image] ) and replaced it with new THHN/THWN Cu.

I don't completely trust Al...

Joined: Feb 2004
Posts: 1,437
Member
Doug...
I expressly note & advise my customers that if they choose to keep their existing aluminum feeder conductors (if they're salvageable)when I do a subpanel changeout, their warranty goes from our company standard for this type of work (10 years) to miniumum allowed by CA contractors law (1 year)
50% of the subpanels I've had to changeout over the years have been from a loosened aluminum connection similar to the above if I hadn't found it for another few weeks or months.. The subpanel above was saveable with some time getting to know a wire brush & some Noalox... Usually I find them with a phase in full melt-down, insulators melted, lug frozen from the arcing & heat...
The other 50% are Zinsco.. need I say more? [Linked Image]

-Randy

Joined: Mar 2004
Posts: 7
L
Junior Member
I know that al. conductors have poor qualities when it comes to copper. But, If Al. conductors keep loosening up and cause arcing over time, why doesn't the power companies have similiar problems? I have seen the lugs on the utility side and it looks like the day it was first landed, but take a look at the lugs after the meter and holy crap, blackened, loose and looking pretty bad.

Joined: Feb 2004
Posts: 1,437
Member
Laguna...
They do! I've been on many service calls that ended up having a loose or corroded PoCo connection being the problem.. One of them was at night, Homeowner lost a phase from SoCal Edison... I looked up at the pole & the phase that'd dropped from his house was glowing from all the resistance at connectors for the neighboring houses... If you open up a typical PoCo residential pedestal, usually you'll find signs of something arcing at one time or another.. These are all Al. connections.. Another member on the board here that'd be alot better informed on the PoCo side of things would be Bjarney... I'm just speaking from my own experiance when dealing with the local PoCo's..

The only PoCo I've seen that Ive never had to call out for trouble service was SDG&E...(Not to say they "never" have problems...)But most of their system is copper!

-Randy


Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
CDS
CDS
Nicholson Ga
Posts: 34
Joined: June 2006
Top Posters(30 Days)
timmp 8
Rachel 4
djk 2
Popular Topics(Views)
281,584 Are you busy
215,222 Re: Forum
202,061 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5