Mark P Posted July 28, 2006 Report Share Posted July 28, 2006 I was wondering if anyone has a theory on what would cause this type of corrosion. The rest of the panel and wires looked fine. Almost seems like dissimelar metals? All the branch wire are copper, not sure what the main wire is. Download Attachment: corrison.jpg 46.72 KB Quote Link to comment Share on other sites More sharing options...
Paul MacLean Posted July 28, 2006 Report Share Posted July 28, 2006 It looks like the entrance cable is aluminum and the corrosion looks like the battery cables in my truck. I'm don't know the cause, but would sure recommend a sparky clean it up and (if aluminum) use some anti-oxidant paste. Note: I had to put a new battery in the truck...maybe I should look under the hood once in a while. Quote Link to comment Share on other sites More sharing options...
Terence McCann Posted July 28, 2006 Report Share Posted July 28, 2006 Hi Mark: Was the breaker rated for aluminum? Quote Link to comment Share on other sites More sharing options...
Mark P Posted July 28, 2006 Author Report Share Posted July 28, 2006 Here is another pic showing the label, if you zoom in you can read it and it shows "CU/AL". I stated the wire was not visable due to the corrision, and of course to have it cleaned and evaluated by a qualified electrician. What exactly does the "CU/AL" stand for. I thought aluminum. On a side note the realtor kept repeating that it had already passed city inspection. Download Attachment: corrision 2.jpg 63.12 KB Quote Link to comment Share on other sites More sharing options...
paul burrell Posted July 28, 2006 Report Share Posted July 28, 2006 Originally posted by AHIS Here is another pic showing the label, if you zoom in you can read it and it shows "CU/AL". I stated the wire was not visable due to the corrision, and of course to have it cleaned and evaluated by a qualified electrician. What exactly does the "CU/AL" stand for. I thought aluminum. On a side note the realtor kept repeating that it had already passed city inspection. Download Attachment: corrision 2.jpg 63.12 KB Passed city inspection means nothing if this item was missed and obviously it was. The Realtor has a totally different objective than the inspector. I pay no attention to remarks from realtors except to say OK I know what you mean. Paul B. Quote Link to comment Share on other sites More sharing options...
Keith Posted July 28, 2006 Report Share Posted July 28, 2006 quote: What exactly does the "CU/AL" stand for. I thought aluminum. CU is copper (periodic table) http://www.webelements.com/webelements/ ... u/key.html Al is aluminum CU/AL = rated for copper/aluminum BTW I'm new to this forum. Hello everyone! From BC Canada. Quote Link to comment Share on other sites More sharing options...
Terence McCann Posted July 28, 2006 Report Share Posted July 28, 2006 Yep, it's rated for aluminum. CU/AL stands for Copper/Aluminum. The wire is Aluminum. Out of curiosity, is the panel in a damp/moist location? Our resident pro is Jim Katen, he should be along to comment. Quote Link to comment Share on other sites More sharing options...
Bill Kibbel Posted July 28, 2006 Report Share Posted July 28, 2006 "I was wondering if anyone has a theory on what would cause this type of corrosion." I always suspect water is entering the service cable. Most of the time I find that to be the cause. No drip loop at connection to OH service. Water in conduit if UG service (capillary action). SEC connection to top of meter box not sealed. No drip loop at SEC connection to side of meter box. Damaged SEC covering. "...the realtor kept repeating that it had already passed city inspection." Around these parts, the few municipalities that do a re-sale inspection do not remove the cover, much less note much of anything important. Quote Link to comment Share on other sites More sharing options...
Mark P Posted July 28, 2006 Author Report Share Posted July 28, 2006 The panel was in the attached garage, (along with electric furnace, and water heater) the drip loop to the service mast on the roof was okay. There was no other sign of damage, corrision, or rust anywhere else. The customer was mighty pretty and single, so maybe I'll call in a month or so to see what the electrician had to say. Thanks all for the input. Quote Link to comment Share on other sites More sharing options...
hausdok Posted July 29, 2006 Report Share Posted July 29, 2006 It looks like acid damage, Wonder if some sparky with his head tucked up his butt thought that soldering flux would make a satisfactory substitute for anti-oxidation paste when he ran out. OT - OF!!! M. Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted July 31, 2006 Report Share Posted July 31, 2006 Originally posted by AHIS Here is another pic showing the label, if you zoom in you can read it and it shows "CU/AL". I stated the wire was not visable due to the corrision, and of course to have it cleaned and evaluated by a qualified electrician. To me, the corrosion looks like it was caused by some kind of environmental contaminant such as water, water vapor, or any number of corrosive gases. Paul MacLean's battery terminals corrode because of the hydrogen sulfide gas that's vented out the battery during its recharge cycle. There's probably no easy way for you to tell what's caused this. It doesn't really matter. The electrician should take apart the connections and clean the wire. If it's damaged, he should cut away the damage and make new connections. If the wires are too short he should splice on new ones. In any event, he should use antioxidant paste. What exactly does the "CU/AL" stand for. I thought aluminum. As the others have said, it means that the breaker specification is for both copper and aluminum wires. An important side note. The CU/AL specification is fine for breakers, but the 15 & 20 amp switches & receptacles labeled "CU/AL" are obsolete. They were the first attempt at dealing with the problem of fires resulting from aluminum branch circuit wiring and they never worked well. If there's aluminum branch circuit wiring in the 15 & 20 amp ranges, the switches and receptacles should bear the more modern specification of "CO/ALR." It stands for "Copper/Aluminum-Revised." The plating on these connections is better able to protect the aluminum from oxidation and from loosening due to expansion-contraction cycles. On a side note the realtor kept repeating that it had already passed city inspection. Everyone's got their own way of dealing with that kind of realtor. How you choose to respond will depend on your goal -- embarrassment, admonishment, education, or physical pain. - Jim Katen, Oregon Quote Link to comment Share on other sites More sharing options...
Jim Morrison Posted July 31, 2006 Report Share Posted July 31, 2006 I'd bet a large sum of money that corrosion was caused by rainwater entering the SEC either at the weatherhead, or at the top of the meter housing. Jimmy Quote Link to comment Share on other sites More sharing options...
Rob Amaral Posted August 1, 2006 Report Share Posted August 1, 2006 Looks like 'wah-tah' to me.. . Quote Link to comment Share on other sites More sharing options...
mgbinspect Posted August 1, 2006 Report Share Posted August 1, 2006 There don't appear to be any tracks on the cable suggesting a water path along the cable. Could the connection be loose? Where's the anti-oxidation solution? (Oops, I see now that Mike mentioned that.) My guess is that a combination of a connection that is not as tight as it should be and oxidation are causing some major resistance and overheating at the connection. Quote Link to comment Share on other sites More sharing options...
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