Installation details [RE-wrenches]

[William Miller]

Tom:

I suggest you may want to take a sick day Monday because your electrician
is going to be pretty angry at you:

250-52(A):
(3) Concrete-Encased Electrode. An electrode encased by at least 50 mm (2
in.) of concrete, located within and near the bottom of a concrete
foundation or footing that is in direct contact with the earth, consisting
of at least 6.0 m (20 ft) of one or more bare or zinc galvanized or other
electrically conductive coated steel reinforcing bars or rods of not less
than 13 mm (½ in.) in diameter, or consisting of at least 6.0 m (20 ft) of
bare copper conductor not smaller than 4 AWG. Reinforcing bars shall be
permitted to be bonded together by the usual steel tie wires or other
effective means.

This is commonly known as a eufer (sp?) ground.

William



At 08:55 PM 11/24/2002 -0700, you wrote:
> 
>
>    Since when is concrete conductive? Photo 6 in the below installation
>detail shows a footer with a ground wire being filled with concrete. While
>I'm NOT an electrician, I have been in construction all my life (so far),
>and was always under the impression bare copper and concrete is a bad
>combination, something about the calcium chlorate in the concrete eats the
>copper. I do know that any slab with copper water supply lines coming up
>through it must have a buffer of some sort, usually a piece of Rubetex or
>some other pipe insulation. By coincidence I just poured a footing 2 days
>ago, and the electrician had ran his ground (residential on grid residential
>addition, no alternative energy involved) down my horizontal rebar in the
>footing, where it would have wound up encapsulated in the concrete. I
>unwound it from the rebar and laid it in the dirt along the footing form,
>and later backfilled over it, and mentioned doing so to the Sparky. He said
>the inspector told him to do it that way. Huh? What am I missing here? I'll
>be seeing the electrician tomorrow, back me up here or tell me where I'm
>wrong!
>
>Tom Simko
>Skyline Solar
> 

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