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Old 01-16-2009, 08:28 PM   #16
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Originally Posted by Yoyizit View Post
Concrete is electrically conductive, many times better than tap water and many times worse than copper.

tap water 10k to 100k ohm-cm = 1M to 100M ohm-M
copper 20 nanoohms-M
concrete 200 ohm-M
soil 300 to 500,000 ohm cm = 30kohms to 50Megohms-M

"The average bulk resistivity of the human body (apart from surface resistance of the skin) is about 5 ohms-m"
If soil is such a poor conductor, then how can POCO use it to deliver power to the primary of the single phase pole-top transformer?
Am I missing something?

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Old 01-16-2009, 09:21 PM   #17
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If soil is such a poor conductor, then how can POCO use it to deliver power to the primary of the single phase pole-top transformer?
Am I missing something?

What do you mean? Its delivered over the top wires, 1-3 phases.

The neutral is bonded together and grounded at each pole.
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Old 01-17-2009, 08:17 AM   #18
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>>> reasoning

Concrete is porous and a person standing on a seemingly dry bare concrete floor is at risk for electrocution if the concrete was really moist. Whereas for a covered floor, wetness will be more obvious.

GFCI protection should be used in any area likely to get wet.
I dont need a coverd floor to call it a finished area. I can paint the walls and call it finished.



The concrete is only part of the problem, probably not what the NEC had in mind though, My take is that a basement in a residential setting is the perfect place a homeowner is going to use a tool with a broken ground pin on it.
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Old 01-17-2009, 08:42 AM   #19
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You could also install a GFCI breaker as an alternative to an outlet.
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Old 01-17-2009, 09:29 AM   #20
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What do you mean? Its delivered over the top wires, 1-3 phases.

The neutral is bonded together and grounded at each pole.
OK. My mistake. The neutral is common between the high voltage and low voltage in the transformer.
The neutral is continuous between POT's, while the hot legs (120V) are not.

As for the grounding to earth, I have seen many of these wires broken. POCO doesn't seem to care.
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Old 01-17-2009, 12:56 PM   #21
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OK. My mistake. The neutral is common between the high voltage and low voltage in the transformer.
The neutral is continuous between POT's, while the hot legs (120V) are not.

As for the grounding to earth, I have seen many of these wires broken. POCO doesn't seem to care.

Those grounds are for the lightning arrestors on the phases. If the poles are not close together...
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Old 01-17-2009, 01:22 PM   #22
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If soil is such a poor conductor, then how can POCO use it to deliver power to the primary of the single phase pole-top transformer?
http://en.wikipedia.org/wiki/Single-wire_earth_return

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