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joint as a handle to drive the pipe into the ground When water pressure is applied, the pipe will sink into the ground as you apply a downward pressure on the tee handle In some cases, the pipe will slip into the ground easily, requiring only a few minutes In other cases, where the soil is hard or has a heavy clay content, it will take considerably greater effort and more time When you finish the task, turn off the water and remove the garden hose Some people also recommend unsoldering and removing the tee joint
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The conductivity of the soil determines how well, or how poorly, it conducts electrical current (Table 29-1) Moist soil over a brackish water dome conducts best (southern swamps make better radio station locations), and the sand of the western deserts makes the worst conductor Figure 29-3 shows a method for reducing the soil electrical resistance by treating with one of two chemicals: copper sulfate or common rock salt The rock salt is one of several salt materials used for snow and ice melting in snow-prone areas of the country If you cannot locate rock salt in a hardware store, then look for a store that sells ice-cream-making supplies Rock salt is a principal ingredient in the process (but not the product)
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Table 29-1 Sample soil conductivity values
Type of soil Salt water Fresh water Pastoral hills Marshy, wooded Sandy Cities Dielectric constant 81 80 14 20 12 10 3 5 Conductivity (siemens /meter) 5 0001 003 001 00075 0002 0001 Relative quality Best Very poor Very good Average/poor Poor Very poor
4- to 5-in layer of rock salt or copper sulfate
Ground rod
29-3A Ground rod with improved ground 6 to 10 in
Trench
29-3B Trenching pattern Ground rod
Figures 29-3A and 29-3B show side and top views (respectively) of a slit trench method of applying the chemical treatment Dig a 6- to 10-in-deep trench, about 12 to 24 in from the ground rod Fill that trench with a 4- or 5-in layer of rock salt or copper sulfate Cover the remaining depth with soil removed when you dug the trench Water the trench well for about 15 minutes The treatment will need to be repeated every 12 to 36 months, depending upon local rainfall and soil composition Figure 29-3C shows an alternative method: the salt pipe Use either copper or PVC plumbing pipe, up to 4 in diameter (although 2 to 3 in is easier to work) The overall length of the pipe should be at least 18 to 24 in, although longer is useful
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29-3C Slow release ground treatment pipe
2- or 3-in copper or PVC pipe filled with rock salt or copper sulfate
18 to 24 in
End cap
Drill a large number of small holes in the pipe (no hole over 3 8 in), sparing only the end that will be above the surface Fill with rock salt or copper sulfate and cap off both ends Install several salt pipes around the ground rod Installation is best accomplished with a fence posthole digger Drop the salt pipe into the hole and backfill with water Remove the top endcap and hose down for about 15 minutes Refill the pipe occasionally to account for the salt leaching out
Multiple ground rods
The key to a low-resistance ground is the surface area in contact with soil One means for gaining surface area, and thereby reducing ground resistance, is to use multiple ground rods Although multiple 4-ft rods are better than a single 4-ft ground rod, the use of 6- or 8-ft rods is recommended even in cases where multiple rods are used Figure 29-4A shows the use of three ground rods in the same system The 8-ft rods are placed 12 to 18 in apart for low- and medium-power levels, and perhaps 30 in for higher amateur power levels An electrical connection is made between the rods on the surface using either copper stripping or copper braid The connections are sweat-soldered in the manner described above, with the feedpoint at the center rod Figure 29-4B shows a more complex system with a larger number of rods laid out in an array The rods are arrayed about 24 in apart As in the previous case, the rods are electrically connected (by braid or foil) on the surface Again, connection to the system is made from the rod at the geometric center of the array
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