Roger (K8RI) wrote:
>
> On 1/3/2011 12:27 PM, jimlux wrote:
>> Mark Robinson wrote:
>>>> NEC doesn't say anything about multiple rods, other than they have to be
>>>> bonded together. (and, of course, that a rod can't be the sole
>>>> grounding means in a new installation)
>>> What do they require now? Several rods. I just beefed up my service
>>> ground (an old steel pipe banged in the ground 30 years ago) with
>>> another 10 foot copper clad rod right by it and then tied the system
>>> into the 30 ground rods in my tower grounding system.
>>>
>> Here's what Art 250.50 of 2005 NEC says:
>> 1) metal underground water pipe at least 10 feet long that is outside
>> the building. A well casing will do.
> Although it's in the NEC a well casing can be a very bad idea and it'd
> never make code here. one, you can't have the well that close and two,
> the ground rods must be within about 6 or 8 feet of the service
> entrance. Getting both requirements is almost impossible. I had to put
> in two ground rods to satisfy the local code when we went to the 200 amp
> service.
>
> I say the well casing is a bad idea as many wells have submersible pumps
> which are easily damaged by lightning strikes the local electricians
> tell me and it does sound plausible.
>
I'll bet that section is aimed at things like isolated pumphouses where
the drop goes to the pumphouse, only.
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