10 Sep
2014
10 Sep
'14
9:56 a.m.
On Sep 10, 2014, at 12:03 PM, Chuck Guzis <cclist at sydex.com> wrote:
On 09/10/2014 01:01 AM, Tothwolf wrote:
Interesting. But ?in addition to? is ok, if I remember right, and is in fact a very good
idea because it may prevent lightning damage to your well pump.
paul
Likely due to diminishing return. Adding yet
another electrode isn't
going to help very much. In specialty applications where a low
resistance ground is required (radio communications for example), they
make special chemical type ground rods. It is also common to install
large ground rings in these sorts of applications.
Okay, so it's 25 ohms or less, so my memory isn't too bad. ;)
I recall this because the subject of well casings (normally galvanized iron pipe) came up
at one point in my life. I'd asked the local inspector if it was permissible to use a
deep well casing as earth ground instead of the usual grounding rod if the well resistance
to earth ground was lower. His response was "no--it is the wrong material"