On 4/24/14, 9:21 PM, Brian Amos wrote:
Thanks for the advice. I think my best course will be to test the
soil conductivity. The only time we have lightening here is during
the summer storms; the soil is usually damp from the sprinklers all
summer so it's probably better with no concrete. Does anyone know the
conductivity of concrete offhand? I guess I could always ask google,
although it probably depends on the aggregate. Local aggregate has a
pretty high iron content and I expect would conduct fairly well,
unless the paste is a good insulator.
concrete is generally higher conductivity than soil:
1) it's hygroscopic so it has higher moisture content
2) it doesn't have voids like soil does (between the grains)
Figure 10-50 mS/meter (viz 5 mS/m for "average soil" and 20 mS/m for
"good soil")
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