[TowerTalk] re 120v inside conduit

[Pete Smith]

At 07:15 PM 4/9/00 -0700, dan hearn wrote:
...
2. Sometime later, she had a problem with the GFI tripping on a circuit
>going to her horse barn. I measured leakage between the conductors in
>the buried Romex. It was buried about 6 inches and was the direct burial
>stuff, type NM I believe it is called. When I uncovered it, sure enough,
>the varmint had chewed the insulation off. I put the new cable in PVC
>pipe and no problem yet. I am locate in the Spokane area. Never had
>these problems inDallas, Hi. 73, Dan, N5AR
>PVC pipe and OK so far.

If it really was NM-B, you will have problems with that line sometime soon,
because it isn't rated for direct burial, and lacks protection against
moisture.  I feel strongly about this because of direct experience with 220
feet of MB-B buried and powering a well pump.  As the plumber said while
the backhoe dug it up, "but I thought the "B" meant burial."  Needless to
say, he won't be back.

NM-B has a loose plastic jacket with the conductors insulated with a
paper-like material.  UF-B, which is rated for direct burial, has the
conductors encapsulated in a molded plastic insulating jacket that
surrounds and protects all the conductors.


73, Pete Smith N4ZR
n4zr@contesting.com 

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