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But we're built on a ledge! (was "Question on grounding rods")
OK, per the thread on "Question on grounding rods", I'm supposed to use 8-foot grounding rods rather than twice as many 4-foot rods. I can see that. But, we're built on a ledge, one big wide rock that stretches from the seacoast to the Vermont state line (that's why they call New Hampshire the "Granite State"). I can get three feet depth at best before running into solid rock. An electrician friend of mine says I can drive the ground rod in at a 45-degree angle, but that would still run an 8-foot ground rod to a depth of more than 5.5 feet below the surface. Can't be done. So, what do I do next? |
But we're built on a ledge! (was "Question on grounding rods")
"Rick (W-A-one-R-K-T)" wrote:
OK, per the thread on "Question on grounding rods", I'm supposed to use 8-foot grounding rods rather than twice as many 4-foot rods. I can see that. But, we're built on a ledge, one big wide rock that stretches from the seacoast to the Vermont state line (that's why they call New Hampshire the "Granite State"). I can get three feet depth at best before running into solid rock. An electrician friend of mine says I can drive the ground rod in at a 45-degree angle, but that would still run an 8-foot ground rod to a depth of more than 5.5 feet below the surface. Can't be done. So, what do I do next? Go long. -- Jim Pennino Remove .spam.sux to reply. |
But we're built on a ledge! (was "Question on grounding rods")
On Thu, 12 Jul 2007 20:18:34 -0400, "Rick (W-A-one-R-K-T)"
wrote: So, what do I do next? Ask your neighbor where they got dispensation. 73's Richard Clark, KB7QHC |
But we're built on a ledge! (was "Question on grounding rods")
"Rick (W-A-one-R-K-T)" wrote in message .. . OK, per the thread on "Question on grounding rods", I'm supposed to use 8-foot grounding rods rather than twice as many 4-foot rods. I can see that. But, we're built on a ledge, one big wide rock that stretches from the seacoast to the Vermont state line (that's why they call New Hampshire the "Granite State"). I can get three feet depth at best before running into solid rock. An electrician friend of mine says I can drive the ground rod in at a 45-degree angle, but that would still run an 8-foot ground rod to a depth of more than 5.5 feet below the surface. Can't be done. So, what do I do next? Rick Check out some new builds in the area and see what earthing arrangements are being put in there. The new properties will obviously have to conform with the latest regulations. If the builders have to use a specially long drill rig, you might be able to bribe them to come and drill you a few new holes. Failing that, its welding a long tube onto whatever you have that will drill through granite and then spending a couple of days drilling downwards. Radio hams are supposed to be renowned for their ingenuity and determination when faced with tricky situations. Build an echosounder or ground resistivity meter and scour the plot looking for a crack you can drive rods down through? The possibilities for experimentation are endless. Mike G0ULI |
But we're built on a ledge! (was "Question on grounding rods")
Mike Kaliski wrote:
"Rick (W-A-one-R-K-T)" wrote in message .. . OK, per the thread on "Question on grounding rods", I'm supposed to use 8-foot grounding rods rather than twice as many 4-foot rods. I can see that. But, we're built on a ledge, one big wide rock that stretches from the seacoast to the Vermont state line (that's why they call New Hampshire the "Granite State"). I can get three feet depth at best before running into solid rock. An electrician friend of mine says I can drive the ground rod in at a 45-degree angle, but that would still run an 8-foot ground rod to a depth of more than 5.5 feet below the surface. Can't be done. So, what do I do next? Rick Check out some new builds in the area and see what earthing arrangements are being put in there. The new properties will obviously have to conform with the latest regulations. If the builders have to use a specially long drill rig, you might be able to bribe them to come and drill you a few new holes. Failing that, its welding a long tube onto whatever you have that will drill through granite and then spending a couple of days drilling downwards. Radio hams are supposed to be renowned for their ingenuity and determination when faced with tricky situations. Build an echosounder or ground resistivity meter and scour the plot looking for a crack you can drive rods down through? The possibilities for experimentation are endless. What purpose would be served by putting a grounding rod in solid rock? All codes/regs I've seen have alternatives for special situations like this, such as buried plates or several horizontal, interconnected, buried rods. -- Jim Pennino Remove .spam.sux to reply. |
But we're built on a ledge! (was "Question on grounding rods")
On Thu, 12 Jul 2007 20:18:34 -0400, "Rick (W-A-one-R-K-T)"
wrote: OK, per the thread on "Question on grounding rods", I'm supposed to use 8-foot grounding rods rather than twice as many 4-foot rods. I can see that. But, we're built on a ledge, one big wide rock that stretches from the seacoast to the Vermont state line (that's why they call New Hampshire the "Granite State"). I can get three feet depth at best before running into solid rock. An electrician friend of mine says I can drive the ground rod in at a 45-degree angle, but that would still run an 8-foot ground rod to a depth of more than 5.5 feet below the surface. Can't be done. So, what do I do next? My house came with 4-foot rods driven at an angle. I wasn't sure why until I tried driving an 8-foot rod straight down. It stopped at about one foot, even using a special ground rod driver from Glen Martin. So I put in a shorty rod, and attached a few buried wire radials, running them across the yard. Ya do what's ya got to do... If you try the Polyphaser web site, they have a pretty good technical paper on putting in a series of short rods. bob k5qwg |
But we're built on a ledge! (was "Question on grounding rods")
wrote in message ... Mike Kaliski wrote: "Rick (W-A-one-R-K-T)" wrote in message .. . OK, per the thread on "Question on grounding rods", I'm supposed to use 8-foot grounding rods rather than twice as many 4-foot rods. I can see that. But, we're built on a ledge, one big wide rock that stretches from the seacoast to the Vermont state line (that's why they call New Hampshire the "Granite State"). I can get three feet depth at best before running into solid rock. An electrician friend of mine says I can drive the ground rod in at a 45-degree angle, but that would still run an 8-foot ground rod to a depth of more than 5.5 feet below the surface. Can't be done. So, what do I do next? Rick Check out some new builds in the area and see what earthing arrangements are being put in there. The new properties will obviously have to conform with the latest regulations. If the builders have to use a specially long drill rig, you might be able to bribe them to come and drill you a few new holes. Failing that, its welding a long tube onto whatever you have that will drill through granite and then spending a couple of days drilling downwards. Radio hams are supposed to be renowned for their ingenuity and determination when faced with tricky situations. Build an echosounder or ground resistivity meter and scour the plot looking for a crack you can drive rods down through? The possibilities for experimentation are endless. What purpose would be served by putting a grounding rod in solid rock? All codes/regs I've seen have alternatives for special situations like this, such as buried plates or several horizontal, interconnected, buried rods. -- Jim Pennino Remove .spam.sux to reply. Jim Yes, you're absolutely right. I was just thinking about how to punch down through 8 feet of rock rather than the end purpose. Ground radials, plates or earth mats buried as well as possible in the soil make a lot more sense. Mike G0ULI |
But we're built on a ledge! (was "Question on grounding rods")
Mike Kaliski wrote:
wrote in message ... Mike Kaliski wrote: "Rick (W-A-one-R-K-T)" wrote in message .. . OK, per the thread on "Question on grounding rods", I'm supposed to use 8-foot grounding rods rather than twice as many 4-foot rods. I can see that. But, we're built on a ledge, one big wide rock that stretches from the seacoast to the Vermont state line (that's why they call New Hampshire the "Granite State"). I can get three feet depth at best before running into solid rock. An electrician friend of mine says I can drive the ground rod in at a 45-degree angle, but that would still run an 8-foot ground rod to a depth of more than 5.5 feet below the surface. Can't be done. So, what do I do next? Rick Check out some new builds in the area and see what earthing arrangements are being put in there. The new properties will obviously have to conform with the latest regulations. If the builders have to use a specially long drill rig, you might be able to bribe them to come and drill you a few new holes. Failing that, its welding a long tube onto whatever you have that will drill through granite and then spending a couple of days drilling downwards. Radio hams are supposed to be renowned for their ingenuity and determination when faced with tricky situations. Build an echosounder or ground resistivity meter and scour the plot looking for a crack you can drive rods down through? The possibilities for experimentation are endless. What purpose would be served by putting a grounding rod in solid rock? All codes/regs I've seen have alternatives for special situations like this, such as buried plates or several horizontal, interconnected, buried rods. -- Jim Pennino Remove .spam.sux to reply. Jim Yes, you're absolutely right. I was just thinking about how to punch down through 8 feet of rock rather than the end purpose. Ground radials, plates or earth mats buried as well as possible in the soil make a lot more sense. Mike G0ULI There are other conciderations as well such as is this an electrical ground to meet some code, a lightning protection ground to keep your insurance in force, or an RF ground to make your antenna work? -- Jim Pennino Remove .spam.sux to reply. |
But we're built on a ledge! (was "Question on grounding rods")
Rick (W-A-one-R-K-T) wrote:
OK, per the thread on "Question on grounding rods", I'm supposed to use 8-foot grounding rods rather than twice as many 4-foot rods. I can see that. But, we're built on a ledge, one big wide rock that stretches from the seacoast to the Vermont state line (that's why they call New Hampshire the "Granite State"). I can get three feet depth at best before running into solid rock. An electrician friend of mine says I can drive the ground rod in at a 45-degree angle, but that would still run an 8-foot ground rod to a depth of more than 5.5 feet below the surface. Can't be done. So, what do I do next? ====================================== Don't know your private land situation , but instead of the 'prescribed' 8ft rods you can obtain an excellent rf earthing system by covering an area with 'galvanised chicken wire mesh 'pegging the mesh to 1 or more short rods or stainless steel pins as used for the BBQ If you have a grass lawn in your garden cover an area ,the larger the better, with the above mesh. Within a few weeks ,if not earlier ,the grass will make the mesh invisible and you will be able to apply a lawnmower over the mesh to cut the grass. Ensure the mesh is well connected to a rod via a jubilee clip which also connected to the shortest possible length of insulated ,thick wire to the shack. The jubilee clip with mesh and wire connected should be protected against corrosion by means of self-amalgamating tape The wire mesh is also a good alternative to multiple radials when using a vertical antenna I remember the situation with a Butternut vertical antenna which initially only had 1 ground spike ,but when surrounded by wire mesh ,signal reports improved by 1 to 2 S-points. Frank GM0CSZ / KN6WH |
But we're built on a ledge! (was "Question on grounding rods")
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