On Wednesday, January 4, 2017 at 12:58:25 PM UTC-5, James Wilkinson Sword wrote:
Wrong as usual. Concrete that's been cured and then dried out,
kept away from moisture, may not be a good conductor. But building
concrete, a foundation is such a good conductor, it's the preferred
ground for the building electrical service. An electrode is placed
inside it before the pour.
First time I've seen ammo dumps mentioned. We're talking about houses, concrete floors, and the dangers of being earthed.
Yes, but not inside the house.
The top surface of the concrete in the house isn't wet. If it is, your carpet would go mouldy.
A man has six items in his bathroom: toothbrush and toothpaste, shaving cream, razor, a bar of soap, and a towel.
The average number of items in the typical woman's bathroom is 337. A man would not be able to identify more than 20 of these items.
Can't help with a link, but I recently replaced my water main with PEX.
That broke the ground to the house and wouldn't pass inspection.
Long story short, research indicated that using rebar in concrete
was a trend in establishing a safety ground. Apparently, there's
enough conductive salt and water in concrete to make it work,
as long as the concrete sits on the ground and you're not in
the desert. Contact resistance is high, but there's a lot of area.
I followed the code and installed two ground rods.
I did some impedance measurements between the rods and the
electrical system ground (before connecting) and determined that the
"grounding" was insufficient to do anything more than
dissipate static electricity, but the
inspector liked it.
I'd guess that hooking to the rebar is at least as good.
It was more about getting an electric shock by standing on the floor of your house while touching something live. This was suggested by someone recently as being a danger. I just measured some concrete to make sure I wasn't being ignorant, and it was off the scale (>20MOhms)
The average lifespan of electronic devices is between zero and infinity, or 2 days after the warranty runs out, whichever comes first.
1cm from electrode to electrode = >20MOhms. That's an INSULATOR. No electricity worth considering is passing at all.
A military pilot called for a priority landing because his single-engine jet fighter was running "a bit peaked."
Air Traffic Control told the fighter jock that he was number two, behind a B-52 that had one engine shut down.
On Wed, 04 Jan 2017 22:22:46 -0000, "James Wilkinson Sword"
Try it and get back to me. That is 20meg at one small point. If you
can find 2 pieces of rebar with 20' in contact with the concrete,
check that to ground or another rebar in the same slab.
"Earth" is a pretty bad conductor in the first place so what you are
really trying to create is an equipotential ground grid.
Cool, especially when the wind is blowing in off the North Sea in
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