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Wire

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max

08-05-2001 08:05:02




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I have some 14 g. wire marked "thnn or thwn or mtw" Anyone know if this is ok for direst burial for my dog's invisible fence?




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Jim

08-08-2001 10:09:13




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 Re: wire in reply to max, 08-05-2001 08:05:02  
thnn wire coating is essentially like PVC pipe. As such, it is a thermosetting, not thermoplastic material. It does get brittle over the years and flake off, but it will work fine for quite some time. Many utilities companies that install a tracer wire with plastic pipes (for locating) have used a thnn coated wire. Most are now using a polyethylene (thermoplastic) material for better longevity.

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Neil

08-06-2001 12:16:41




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 Re: wire in reply to max, 08-05-2001 08:05:02  
Not sure what you mean. Is the wire marked thnn/thwn/mtw, or do you have three different types of wire?
If you have a three types use the thwn, as it is the only one marked for wet locations.
If it is market all three, then it is fine.
As for the depth, use the recommendations of the IF people, as this is an antenna and putting it deeper will probably keep it from working.



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Noel

08-06-2001 11:58:02




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 Re: wire in reply to max, 08-05-2001 08:05:02  
As others have said, it'll serve your purpose just fine. THHN/MTW is not moisture resistant and WILL absorb water over the years, even though it uses a thermoplastic insulation. That would be important if this were a current carrying application, per it's rating. On a related note, I have had to replace/repair many UF cables over the years that were not buried deep enough to prevent damage from a shovel or subsoiler cable/phone companies (or invisible fence installers) use to bury their lines. NEC cover requirement are designed to prevent these incidents. That is one reason following the Code is a good idea, even if it seems convoluted at the time.

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Gene Davis

08-05-2001 20:05:11




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 Re: wire in reply to max, 08-05-2001 08:05:02  
We put down an Invisible Fence for my daughters dog, and it came with THHN 14 gauge wire, has been buried for more than 10 yrs, it can only be buried about 2" deep, more makes the signal weak, the beauty of the IF company is the durability of this unit, many cheaper brands have come and gone since we planted it and now lot of pet owners around here are sorry they bought the cheaper look-alike brands, also have been impressed with their policy of making it good for a lifetime warranty against lightning, mail it and the arrestor in and they sent a replacement by return mail! I am very pleased with our unit. Gene

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Franz

08-05-2001 12:02:58




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 Re: wire in reply to max, 08-05-2001 08:05:02  
THHN/MTW is thermoplastic insulated hi temp rated with a nylon outer coating, and MTW indicates approval for machine tool wiring, usually indicitive of flexability and oil resistance.
Invisable fence uses a twisted pair antenna, but I'm not sure why. The wire they use looks an awful lot like military field phone wire. Never have been able to get a good conversation going with the IF guy, so I figure they got something to hide.
Best answer, lay it out on the ground and see if it works, before you go to all the work of burying it.

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Mark Kw

08-05-2001 09:18:35




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 Re: wire in reply to max, 08-05-2001 08:05:02  
I think the invisible fence is RF signal and not really a voltage current producer. Should be OK for use in this application but I would suggest checking with the fence mfg to be sure it will function properly before you go digging.



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Dusty MI

08-05-2001 12:34:10




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 Re: Re: wire in reply to Mark Kw, 08-05-2001 09:18:35  
The wire that you have will work fine. The wire that they use is the same as yours but #16 or #18, I forget which. It is actually an antenna, so if you want to put the controller a building in the middle of an area to be fenced, then you twist two wires togeather to make a twisted pair, that cancels the signal, then run a single wire around the area to be fenced to make a complete loop.
I have a plow to do this.
Good Luck,
Dusty

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