weird mark on wire?


  #1  
Old 10-09-14, 02:48 PM
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weird mark on wire?

This kind of looks like a burn mark but it's in a weird place on the cable and very unlikely to have any overheating in that area as there's no splice?
It doesn't seem to come off when I rub on it so could just be old dirt?

 
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Old 10-10-14, 06:57 AM
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Mark

Cable looks like it has been kinked. could wire be partially broken, creating a hot spot?
 
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Old 10-10-14, 07:52 AM
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It's 12 guage wire, pretty hard to break just from one kink. In fact you can bend tht stuff quite afew times before anything happens.
 
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Old 10-10-14, 08:08 AM
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I thought the same thing as Wirepuller, a kink or crimp. Especially the cable at left. In picture looks like it was stapled at some point.

The cable in middle appears to have a burn mark (or some mark) and a bulge.
I'm not sure how this could happen, unless there are soldered pipes in the area, or maybe it was damaged by getting hammered or something.
Any doubts, change it out while you're in there.
 
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Old 10-10-14, 08:28 AM
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It's the main source line form the panel - to change it out I'd have to destroy all the ceiling and fine the cable somehow. The bulge is just the picture perspective...it just seems to be a flat mark.
 
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Old 10-10-14, 09:11 AM
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Well,
It's hard to give advice on something like this. If you have no reason to believe it needs swapped out, leave it alone.
The sheathing and insulated wires inside of the sheathing can withstand quite a bit of abuse.
So you have two things going for you:
1) Doesn't look like cable was abused.
2) You didn't mention any problem with voltage or other problems at device that this cable supplies.
 
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Old 10-10-14, 10:59 AM
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Looks like dirt to me. I would be more concerned about that exposed conductor and why is it just laying there.
 
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Old 10-10-14, 11:23 AM
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Do you mean that white cable underneath? That is an alarm cable (low voltage).
The source is about 25ft long and then branches into 2 more cables about 15ft long each.
Would tere be much voltage drop in that type of circuit 12 guage running around 14 amps (3250W)?
If the cable was damaged how much would it affect the voltage?
 
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Old 10-10-14, 11:38 AM
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Is this the cable dirtydickey is referring to?

Attachment 39809

It does look a little suspicious, like it was an afterthought or added at some point.

qwertyjjj, what does this cable serve? Just curious.
 
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Old 10-10-14, 11:51 AM
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Alarm cable Brian...see the post before yours.
 
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Old 10-10-14, 12:10 PM
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Yes, I saw it Vic, but too late.

If the cable was damaged how much would it affect the voltage?
qwertyjjj:
I want to leave this post to the professional electricians. I'm sure you're asking for test purposes and not asking if it's acceptable to have a damaged wire delivering enough power for your needs.
 
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Old 10-10-14, 12:18 PM
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I'm trying to figure out of it's damaged as it's not easy to replace?
It seems an unlikely place for a burn/overheating mark given it's tough 12 guage wire but let's just suppose the copper was damaged. Would it even deliver 240v for the heaters to work?
could the heaters operate on less voltage anyway or would they just operate at less power?
 
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Old 10-10-14, 12:47 PM
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Im still not sure what "damage" your even referring to.

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All I see is some dark spots that could be dirt (or hell, could be burn your not going to get someone to say for sure with that photo). I also see a nicked cable jacket (put a wrap of scotch 33 on it).

As for replacement (if indeed that is called for) why would you replace the entire run back to the panel?.... that sounds expensive and hard. You would just cut it and install a junction box in an accessible location.
 
 

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