On 8/18/23 4:21 PM, Jim Brown wrote:
On 8/18/2023 4:00 PM, Lux, Jim wrote:
OK - you're in sort of an interesting situation, because your "shack
ground" electrode isn't part of the required grounding for your house
- that is, it's not a supplemental grounding electrode.
Nor is it part of a lightning grounding/dissipation system, so all
those rules don't matter.
There absolutely IS a requirement that all grounds in a premises be
bonded together. If power is fed from one building to another, there
must be an earth electrode in the second building, bonded to the panel
(but NOT bonded to neutral in the second building IF ground is carried
from the first building). Until 10-15 years ago, NEC did not require
ground to be carried between buildings, and my property was built that
way. It was subsequently modified to require that ground be carried,
but existing installations are grandfathered.
I agree, it's just that the code isn't real clear on the minimum size
requirement for that bonding jumper. (as you point out in the next
paragraph). Nor is there a requirement for a separate bonding conductor
- You could conceivably hook the rod to the "greenwire" ground and call
it done. In this case I'm not sure the shack isn't at one end of the
house and the entrance at the other end
The only thing about which I'm uncertain is conductor diameter. It's
always been good engineering practice, especially where antennas are
involved, for buildings to have a perimeter ground, with rods at
various points around the perimeter. AT&T's Long Lines sites were
built that way, and Ward recommends it in his book. I use a
half-perimeter ground in the building that houses my shack; a cement
patio is in the way of full perimeter. There are about 8 rods spaced
along it, at the panel, and outside the shack near my coax entry panels.
Perimeter or UFER/CEGE.
73, Jim K9YC
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