FYI resistence of CEE

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benaround

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Location
Arizona
For those who would like to know, 20' of bare 3/0 in a monolithic style footing

no rebar, test came back at 6.7 ohms and this is in Arizona. Test was $400.00.
 
benaround said:
For those who would like to know, 20' of bare 3/0 in a monolithic style footing

no rebar, test came back at 6.7 ohms and this is in Arizona. Test was $400.00.
Click to expand...

Wow, why was 3/0 used instead of #4. I'd love to know what #4 is.
 
Dennis Alwon said:
Wow, why was 3/0 used instead of #4. I'd love to know what #4 is.
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That's what the EE had on the prints. Just a guess but #4 is probably close to the same ?
 
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benaround said:
That's what the EE had on the prints. Just a guess but #4 is probably close to the same ?
Click to expand...

I met a guy who installs those chemical rods and he was bragging that he could usually get it down to about 5- 10 ohms. He was going to check my #4 Cee out of curiousity but he never did-- maybe he did and doesn't want the results to get out. One of those chemical rods is about $800 then there's the labor etc. He usually uses more than one.
 
benaround said:
For those who would like to know, 20' of bare 3/0 in a monolithic style footing

no rebar, test came back at 6.7 ohms and this is in Arizona. Test was $400.00.
Click to expand...

How far out from the grounding electrode was this result?
 
tryinghard said:
How far out from the grounding electrode was this result?
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Sorry, I was not pressent at the test, but, it was the same guy we use for

HiPot testing and he is a real straight shooter. If there are certian distances

required, I am sure he adheared to them.
 
Dennis Alwon said:
I met a guy who installs those chemical rods and he was bragging that he could usually get it down to about 5- 10 ohms...
Click to expand...

I?ve heard of these a few times in my resent past, I?ve never used one. I wonder how dose NEC address these chemical type electrodes?
 
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