Wire With Unknown Purpose

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Old 04-15-07, 07:41 PM
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Wire With Unknown Purpose

I have a 12 ga white wire running from under the sill plate (atop concrete block foundation) to the electrical panel, terminating at the neutral bus.

Is this a bonding wire? If not, I have absolutely no idea what it would be there for!

JimC
 
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Old 04-15-07, 07:47 PM
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where does the other end connect??
 
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Old 04-15-07, 08:04 PM
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This is just a single white wire, running by itself with no other wires? Not a cable? If so, it can serve no legal purpose. But as nap said, see if you can find out where it goes.
 
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Old 04-15-07, 08:18 PM
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Unknown wire

Yes, this is a single 12 ga white wire.

It disappears between the sill plate and the top course of concrete blocks. Short of gently disassembling the foundation with a sledge hammer (which I don't really think I'll do), I really have no way of determining where it goes. If it went between the sill plate and the steel I-Beam supports, I could more probably think of it as bonding but between the foundation blocks and sill plate, it doesn't seem to make any sense to me.

JimC
 
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Old 04-15-07, 08:39 PM
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the only thing I can think of offhand would be some sortg of bonding wire to some rebar in the block if it was filled with mortor or concrete.

If it doesn't hurt anything, I would leave it be.
 
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Old 04-16-07, 05:10 AM
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It sounds like a grounding/bonding to the armouring.
In Norway new houses has this connection to make sure the armouring and ground has the same potential. The wire shold be at least no 9 here
(6 mm^2)

If so it is made for protection.

dsk
 
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Old 04-16-07, 05:14 AM
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Regardless of purpose, it is clearly illegal. However, this may be one of thos cases where it is best to leave it be . I don't think you want to smash up your wall just to fix somehtign that techinically works.
 
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Old 04-16-07, 07:29 AM
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Could it possibly be going to the telephone or cable connection for a ground?
 
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Old 04-16-07, 09:52 AM
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Here we use separate ground bus, and newtral bus. Newtral and ground is linked together, but may be separated. Probably for measuring.
Your white wire shold hve been green/yellow here and go tou the ground bus.

Do you have same system?

dsk
 
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Old 04-16-07, 10:23 AM
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IF there is a Grounding Electrode (G-E) for a CATV system , the NEC requires a Bonding conductor between the CATV G-E and the G-E that Grounds the Neutral Service Conductor.

This could be effected with a conductor from the CATV Ground-point that terminates on the Neutral terminal-bar in the Service Panel.

Re: "Exhibit 250,40 " in the NEC 2005 "Handbook"
 
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Old 04-16-07, 05:53 PM
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Is there a chance that you have an invisible fence system for pets installed in your yard?
 
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Old 04-16-07, 08:03 PM
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Unknown Wire

1. No underground fence system
2. No CATV system
3. Goes directly from somewhere under sill plate (between plate and block foundation) to neutral bus bar in panel.
4. No unusual systems at all. Ground is at pole about 15 feet from corner of house upon which meter is attached - at least this is the only ground I have found. Also a remote disconnect switch on this pole as it was setup for one-line feeder when the basement was being constructed in 1968.

Since I don't know what it is for, I'm just going to leave it alone. The only damage it is doing that I can see is eating up one connection on the neutral bus and I have plenty remaining.

Very strange, though.

JimC
 
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Old 04-19-07, 01:38 PM
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It seems like it is several differnt systems in use in the USA, just as different systems are common here.

You could read this:
http://www.schneider-electric.com/cahier_technique/en/pdf/ect173.pdf

If neutral and ground is linked together in your house the cabel will probably do no harm. If N is properly grounded in supply transformer, and solely there, a short betweene phase and n may cause large currents thru your n to ground. This current may not be protected by any fuse.

No good answer, but the link is quite informative.

dsk
 
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