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#1
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OT - Power Pole Guy Wires
How do they determine where to place the guy wire for a power pole?
They replaced 2 poles on my street this week. On one pole, they placed the guy wire perpendicular to the street, on the other it's parallel. In both cases, there is space to have put it either way, so I don't think "location" was the issue. In both cases, the prevailing wind will hit the poles from the same direction, so the guy wire placement can't be based on that. On the "perpendicular" pole there are wires that come to the pole from almost the opposite direction of the guy wire (as if the guy wire offsets the tension of the wires) but also a set of wires that leave the pole at a right angle to the guy wire. Those wires go to the other pole in question. On the "parallel" pole the wires come to and leave the pole in line with guy wire, so if the guy wire is offsetting the tension of one set, it's doing nothing for the other. Since there is nothing consistant in the placement of the guy wire for these 2 poles, they've got me curious. |
#2
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OT - Power Pole Guy Wires
The name of this NG is not "OT"! Why don't you ask your local electric that
question? All you're going to get are guesses and by gollies from here. Assuming you're not a troll, that is. In , DerbyDad03 typed: .... |
#3
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OT - Power Pole Guy Wires
On Mar 20, 5:20*pm, "Twayne" wrote:
The name of this NG is not "OT"! Why don't you ask your local electric that question? All you're going to get are guesses and by gollies from here. Assuming you're not a troll, that is. , DerbyDad03 typed: ... If you think that all I'm going to get "are guesses and by gollies from here", sit back and watch. Assuming you're not a troll, that is. |
#4
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OT - Power Pole Guy Wires
On Tue, 20 Mar 2012 13:28:31 -0700 (PDT), DerbyDad03
wrote: How do they determine where to place the guy wire for a power pole? They replaced 2 poles on my street this week. On one pole, they placed the guy wire perpendicular to the street, on the other it's parallel. In both cases, there is space to have put it either way, so I don't think "location" was the issue. In both cases, the prevailing wind will hit the poles from the same direction, so the guy wire placement can't be based on that. On the "perpendicular" pole there are wires that come to the pole from almost the opposite direction of the guy wire (as if the guy wire offsets the tension of the wires) but also a set of wires that leave the pole at a right angle to the guy wire. Those wires go to the other pole in question. On the "parallel" pole the wires come to and leave the pole in line with guy wire, so if the guy wire is offsetting the tension of one set, it's doing nothing for the other. First, I must take issue with the consistent use of guy wires. I think you should either use of mixture of guy and gall wires, or you should say, "affable young most-likely single person wires". Or g-wires. I gather the parallel pole has major wires in only one direction, so the g-wires are oopposite of that. At the perp pole, I gather there is nothing, not a g-wire or a transmission wire, opposite the wires going to the parallel pole. That's interesting. They may have some way to know nothing is necessary, some device that measures tension, or how vertical the polie is when no wires are attached, or they know from the length and weight of the wires that they aren't enough to need a counter force, but of course, then how come there are guy-wires at the perp pole. Oh, darn. I called them guy-wires. Now my girl friend won't lend me money for at least a week. Come to think of it, I don't recall seeing ggg-stop hitting me-- wires. in more than one direction on the same pole. But I once had occasion to erect 12 to 18 foot poles which were connected at the top by a wire, actually heavy monofilament, but they were called wires, and the poles were aluminum and light-weight. Where the wire.turned a corner, I would have to put in guy wires (All right, leave if you want to.) and I had to bisect the externior angle made by the wires at the corner where they met. I would tie the guy wire to a tree and there wasn't always a tree in the right spot, so I took the nearest tree, and I could feel the difference as I held the guy wire and moved it from the place I preferred to a nearby tree. But the line was light and nothing was thick enough to catch much wind, so I don't think anything ever fell down for lack of guy (Ha!) wires. Three or 4 times over 10 years a piece of alumninum tubing bent and the tubing folded. Since there is nothing consistant in the placement of the guy wire for these 2 poles, they've got me curious. |
#5
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OT - Power Pole Guy Wires
On Tue, 20 Mar 2012 13:28:31 -0700 (PDT), DerbyDad03
wrote: How do they determine where to place the guy wire for a power pole? They replaced 2 poles on my street this week. On one pole, they placed the guy wire perpendicular to the street, on the other it's parallel. In both cases, there is space to have put it either way, so I don't think "location" was the issue. The guy wire doesn't care where the street is-- it is offset some tension on the pole. There is either a bit of a corner, or a spur going off [or going to go off] any pole with a guy wire on it. In both cases, the prevailing wind will hit the poles from the same direction, so the guy wire placement can't be based on that. We never accounted for wind. I was on a telephone crew, so we had shorter poles, but heavier, and less aerodynamic wires. There were places we could put 10-12 poles in a straight line & none needed guying, even though the prevailing wind was pretty stiff on the mountaintops. On the "perpendicular" pole there are wires that come to the pole from almost the opposite direction of the guy wire (as if the guy wire offsets the tension of the wires) That what they do. but also a set of wires that leave the pole at a right angle to the guy wire. Those wires go to the other pole in question. When we were doing it [at a little independent telco in the 70's], it was pretty much 'by guess and by gosh'- but some engineer probably has figured out the pounds of tension produced by a span of wires at a certain angle and a certain length. That strain will help hold a smaller lighter load in a different direction. On the "parallel" pole the wires come to and leave the pole in line with guy wire, so if the guy wire is offsetting the tension of one set, it's doing nothing for the other. Since there is nothing consistant in the placement of the guy wire for these 2 poles, they've got me curious. Plans for spur lines are sometimes in the works so when you put in the main line you put guy wires in for the spurs. They might go slack for a couple years until the spur gets built, then they get snugged up. Jim |
#6
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OT - Power Pole Guy Wires
On 3/20/2012 3:28 PM, DerbyDad03 wrote:
How do they determine where to place the guy wire for a power pole? They replaced 2 poles on my street this week. On one pole, they placed the guy wire perpendicular to the street, on the other it's parallel. In both cases, there is space to have put it either way, so I don't think "location" was the issue. In both cases, the prevailing wind will hit the poles from the same direction, so the guy wire placement can't be based on that. On the "perpendicular" pole there are wires that come to the pole from almost the opposite direction of the guy wire (as if the guy wire offsets the tension of the wires) but also a set of wires that leave the pole at a right angle to the guy wire. Those wires go to the other pole in question. On the "parallel" pole the wires come to and leave the pole in line with guy wire, so if the guy wire is offsetting the tension of one set, it's doing nothing for the other. Since there is nothing consistant in the placement of the guy wire for these 2 poles, they've got me curious. the guy wires are always 180 degrees from the load. If perpendicular to the street, then it's to offset the load of the drop opposite to the guy wire. If inline, then it may be a case of wire size changing. In front of my house the cable gets smaller as there is only two more houses north of me, so the guy wires pull against the heavier wire to the south. Look closely, and you'll see the reason for each guy wire. -- Steve Barker remove the "not" from my address to email |
#7
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OT - Power Pole Guy Wires
On Mar 20, 8:20*pm, Steve Barker wrote:
On 3/20/2012 3:28 PM, DerbyDad03 wrote: How do they determine where to place the guy wire for a power pole? They replaced 2 poles on my street this week. On one pole, they placed the guy wire perpendicular to the street, on the other it's parallel. In both cases, there is space to have put it either way, so I don't think "location" was the issue. In both cases, the prevailing wind will hit the poles from the same direction, so the guy wire placement can't be based on that. On the "perpendicular" pole there are wires that come to the pole from almost the opposite direction of the guy wire (as if the guy wire offsets the tension of the wires) but also a set of wires that leave the pole at a right angle to the guy wire. Those wires go to the other pole in question. On the "parallel" pole the wires come to and leave the pole in line with guy wire, so if the guy wire is offsetting the tension of one set, it's doing nothing for the other. Since there is nothing consistant in the placement of the guy wire for these 2 poles, they've got me curious. the guy wires are always 180 degrees from the load. *If perpendicular to the street, then it's to offset the load of the drop opposite to the guy wire. *If inline, then it may be a case of wire size changing. *In front of my house the cable gets smaller as there is only two more houses north of me, so the guy wires pull against the heavier wire to the south. *Look closely, and you'll see the reason for each guy wire. -- Steve Barker remove the "not" from my address to email The pole in front of my house has the perpendicular guy wire which as I said in my OP appear to be the offset from the wires that come in from the pole across the street. However, there is also a set of wires coming off of the pole at 90 degrees from the guy wire. If there were to be a guy wire 180 degrees from that wire, the guy wire would end up in my driveway. I'll have to look at the other pole, the one with the guy wire in line with the wires. Maybe one set of wires is smaller than the other...I'll have to check when the sun comes up. |
#8
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OT - Power Pole Guy Wires
On Tue, 20 Mar 2012 13:28:31 -0700 (PDT), DerbyDad03
wrote: How do they determine where to place the guy wire for a power pole? They replaced 2 poles on my street this week. On one pole, they placed the guy wire perpendicular to the street, on the other it's parallel. In both cases, there is space to have put it either way, so I don't think "location" was the issue. In both cases, the prevailing wind will hit the poles from the same direction, so the guy wire placement can't be based on that. The pole in front of my house is the last one. The guy wire is parallel to the street and will offset any pull from the wires on the opposite side. Wind is not a factor, at least on this pole. They may factor in common sense too. Are the pole in front of a residence? Will the wire interfere with or be on private property? While the pole in front of my house is on "my" lawn, it is in fact on the right of way that I do not own. FWIW, there are also two Poles in my house. |
#9
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OT - Power Pole Guy Wires
On Mar 20, 1:28*pm, DerbyDad03 wrote:
How do they determine where to place the guy wire for a power pole? They replaced 2 poles on my street this week. On one pole, they placed the guy wire perpendicular to the street, on the other it's parallel. In both cases, there is space to have put it either way, so I don't think "location" was the issue. In both cases, the prevailing wind will hit the poles from the same direction, so the guy wire placement can't be based on that. On the "perpendicular" pole there are wires that come to the pole from almost the opposite direction of the guy wire (as if the guy wire offsets the tension of the wires) but also a set of wires that leave the pole at a right angle to the guy wire. Those wires go to the other pole in question. On the "parallel" pole the wires come to and leave the pole in line with guy wire, so if the guy wire is offsetting the tension of one set, it's doing nothing for the other. Since there is nothing consistant in the placement of the guy wire for these 2 poles, they've got me curious. DD- I'm not sure I'm following your pole descriptions entirely correctly but generally speaking...... The forces applied (by the electrical wires) to a utility pole must be resisted by 1) bending forces in the pole (as in an un-guyed flag pole) 2) compression forces in the pole 3) tension in guy wires 4) a combination of 1), 2) or 3). The utility company does what's easiest / most cost effective. You'll see some situations at the end of a run, where the cables are routed underground, very large poles. These "dead end" poles are often not guyed and thus resist the forces by bending. You'll see situations were a pole might be guyed in one direction but not the other. The loads in the un-guyed direction most likely are low enough to be handled by the pole alone. Sometimes there will be a lone guyed pole without any electrical wires, just a horizontal "guy" to another pole, thus providing a "remote" guy when it is not possible to place a "local" guy. The selection of poles & placement of guys is all about force balance. cheers Bob PS I guess Twayne was mistaken..... by golly |
#10
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OT - Power Pole Guy Wires
Jim Elbrecht wrote in
: When we were doing it [at a little independent telco in the 70's], it was pretty much 'by guess and by gosh'- but some engineer probably has figured out the pounds of tension produced by a span of wires at a certain angle and a certain length. That strain will help hold a smaller lighter load in a different direction. I have a related question: How are the guy wires held in the ground? What keeps the steel loop from coming out of the soil? -- Tegger |
#11
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OT - Power Pole Guy Wires
On Mar 20, 8:28*pm, DerbyDad03 wrote:
How do they determine where to place the guy wire for a power pole? They replaced 2 poles on my street this week. On one pole, they placed the guy wire perpendicular to the street, on the other it's parallel. In both cases, there is space to have put it either way, so I don't think "location" was the issue. In both cases, the prevailing wind will hit the poles from the same direction, so the guy wire placement can't be based on that. On the "perpendicular" pole there are wires that come to the pole from almost the opposite direction of the guy wire (as if the guy wire offsets the tension of the wires) but also a set of wires that leave the pole at a right angle to the guy wire. Those wires go to the other pole in question. On the "parallel" pole the wires come to and leave the pole in line with guy wire, so if the guy wire is offsetting the tension of one set, it's doing nothing for the other. Since there is nothing consistant in the placement of the guy wire for these 2 poles, they've got me curious. Ideally they take the vectorsum of the forces caused by the wires and put the guy wire there. So if it's the end of a run it will be @ 180 dgerees. If it's at a change in direction, they bisect the obtuse angle. |
#12
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OT - Power Pole Guy Wires
On Mar 21, 7:55*am, Tegger wrote:
Jim Elbrecht wrote : When we were doing it [at a little independent telco in the 70's], it was pretty much 'by guess and by gosh'- but some engineer probably has figured out the pounds of tension produced by a span of wires at a certain angle and a certain length. * *That strain will help hold a smaller lighter load in a different direction. I have a related question: How are the guy wires held in the ground? What keeps the steel loop from coming out of the soil? -- Tegger They have "ground anchors". They are spirally wound steel rods. Just screw into the ground. Or sometimes a helix. Similar to this. http://en.wikipedia.org/wiki/Screwpiles |
#14
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OT - Power Pole Guy Wires
Tegger wrote:
harry wrote in : On Mar 21, 7:55*am, Tegger wrote: -snip- I have a related question: How are the guy wires held in the ground? What keeps the steel loop from coming out of the soil? They have "ground anchors". They are spirally wound steel rods. Just screw into the ground. Or sometimes a helix. Similar to this. http://en.wikipedia.org/wiki/Screwpiles That seems to be it, thanks. It helps when you know what they're called. I can't imagine the force it must take to screw these things in, especially into the heavy clay soils of my area. We had anchors that you had to dig a hole for. 4, 6, or 8' depending on what we thought was necessary. Then we got a new truck with the giant auger on it. That sucker not only dug pole & anchor holes-- it could twist one of those new-fangled screw anchors right into the ground without leaving a giant mess. "Screwpile" appears to be a UK term. I find more American hits using the terms "helical anchor", or "helical anchor guy wire". http://www.ecputility.com/Guy_Anchors.asp I'd love to see the rest of that picture with the 6 anchors coming out of the ground--- Where do all the wires go? What is under the ground? That's got to be the last tower on a high power line. . . ? Jim |
#15
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OT - Power Pole Guy Wires
On Tue, 20 Mar 2012 19:06:53 -0400, Jim Elbrecht
wrote: On Tue, 20 Mar 2012 13:28:31 -0700 (PDT), DerbyDad03 wrote: How do they determine where to place the guy wire for a power pole? They replaced 2 poles on my street this week. On one pole, they placed the guy wire perpendicular to the street, on the other it's parallel. In both cases, there is space to have put it either way, so I don't think "location" was the issue. The guy wire doesn't care where the street is-- it is offset some tension on the pole. There is either a bit of a corner, or a spur going off [or going to go off] any pole with a guy wire on it. In both cases, the prevailing wind will hit the poles from the same direction, so the guy wire placement can't be based on that. We never accounted for wind. I was on a telephone crew, so we had shorter poles, but heavier, and less aerodynamic wires. There were places we could put 10-12 poles in a straight line & none needed guying, even though the prevailing wind was pretty stiff on the mountaintops. On the "perpendicular" pole there are wires that come to the pole from almost the opposite direction of the guy wire (as if the guy wire offsets the tension of the wires) That what they do. but also a set of wires that leave the pole at a right angle to the guy wire. Those wires go to the other pole in question. When we were doing it [at a little independent telco in the 70's], it was pretty much 'by guess and by gosh'- but some engineer probably has figured out the pounds of tension produced by a span of wires at a certain angle and a certain length. That strain will help hold a smaller lighter load in a different direction. On the "parallel" pole the wires come to and leave the pole in line with guy wire, so if the guy wire is offsetting the tension of one set, it's doing nothing for the other. Since there is nothing consistant in the placement of the guy wire for these 2 poles, they've got me curious. Plans for spur lines are sometimes in the works so when you put in the main line you put guy wires in for the spurs. They might go slack for a couple years until the spur gets built, then they get snugged up. Jim As an engineer I once designed a couple of poles but I think they were more of transmission lines but I imagine there is similiarity. As I recall it had to do with the tension or pull of the cables. I think there is some code I read on this having to do with the amount of pull of the cables on the pole. I don't think for telephone poles, these anchors had to do with any wind because they usually bury these poles deep enough to account for wind. |
#16
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OT - Power Pole Guy Wires
On Tue, 20 Mar 2012 23:04:01 -0700 (PDT), DD_BobK
wrote: On Mar 20, 1:28*pm, DerbyDad03 wrote: How do they determine where to place the guy wire for a power pole? They replaced 2 poles on my street this week. On one pole, they placed the guy wire perpendicular to the street, on the other it's parallel. In both cases, there is space to have put it either way, so I don't think "location" was the issue. In both cases, the prevailing wind will hit the poles from the same direction, so the guy wire placement can't be based on that. On the "perpendicular" pole there are wires that come to the pole from almost the opposite direction of the guy wire (as if the guy wire offsets the tension of the wires) but also a set of wires that leave the pole at a right angle to the guy wire. Those wires go to the other pole in question. On the "parallel" pole the wires come to and leave the pole in line with guy wire, so if the guy wire is offsetting the tension of one set, it's doing nothing for the other. Since there is nothing consistant in the placement of the guy wire for these 2 poles, they've got me curious. DD- I'm not sure I'm following your pole descriptions entirely correctly but generally speaking...... The forces applied (by the electrical wires) to a utility pole must be resisted by 1) bending forces in the pole (as in an un-guyed flag pole) 2) compression forces in the pole 3) tension in guy wires 4) a combination of 1), 2) or 3). Compression forces in a pole??? How does a guy wire take out compression forces? Engineer wannabee???? The utility company does what's easiest / most cost effective. You'll see some situations at the end of a run, where the cables are routed underground, very large poles. These "dead end" poles are often not guyed and thus resist the forces by bending. You'll see situations were a pole might be guyed in one direction but not the other. The loads in the un-guyed direction most likely are low enough to be handled by the pole alone. Sometimes there will be a lone guyed pole without any electrical wires, just a horizontal "guy" to another pole, thus providing a "remote" guy when it is not possible to place a "local" guy. The selection of poles & placement of guys is all about force balance. cheers Bob PS I guess Twayne was mistaken..... by golly |
#17
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OT - Power Pole Guy Wires
On Wed, 21 Mar 2012 06:51:51 -0500, "Doug"
wrote: On Tue, 20 Mar 2012 23:04:01 -0700 (PDT), DD_BobK wrote: On Mar 20, 1:28*pm, DerbyDad03 wrote: How do they determine where to place the guy wire for a power pole? They replaced 2 poles on my street this week. On one pole, they placed the guy wire perpendicular to the street, on the other it's parallel. In both cases, there is space to have put it either way, so I don't think "location" was the issue. In both cases, the prevailing wind will hit the poles from the same direction, so the guy wire placement can't be based on that. On the "perpendicular" pole there are wires that come to the pole from almost the opposite direction of the guy wire (as if the guy wire offsets the tension of the wires) but also a set of wires that leave the pole at a right angle to the guy wire. Those wires go to the other pole in question. On the "parallel" pole the wires come to and leave the pole in line with guy wire, so if the guy wire is offsetting the tension of one set, it's doing nothing for the other. Since there is nothing consistant in the placement of the guy wire for these 2 poles, they've got me curious. DD- I'm not sure I'm following your pole descriptions entirely correctly but generally speaking...... The forces applied (by the electrical wires) to a utility pole must be resisted by 1) bending forces in the pole (as in an un-guyed flag pole) 2) compression forces in the pole 3) tension in guy wires 4) a combination of 1), 2) or 3). Compression forces in a pole??? How does a guy wire take out compression forces? Engineer wannabee???? Just so I make myself clear, yes there can be compression forces in a pole but a guy wire does NOT take them out. |
#18
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OT - Power Pole Guy Wires
Jim Elbrecht wrote in
news Tegger wrote: .. http://www.ecputility.com/Guy_Anchors.asp I'd love to see the rest of that picture with the 6 anchors coming out of the ground--- Where do all the wires go? What is under the ground? That's got to be the last tower on a high power line. . . ? Or a radio antenna? We have a similar arrangement down the hill from my place. There are (I think) six power lines on the pole, and six guy wires. The pole is pulled back so tightly it's actually bowed. That's what got me thinking about why those anchors didn't pull out of the ground. -- Tegger |
#19
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OT - Power Pole Guy Wires
"Doug" wrote in
: Just so I make myself clear, yes there can be compression forces in a pole but a guy wire does NOT take them out. If anything, I'd think guy wires ADD compression to the pole, since they pull downwards as well as sidewards. -- Tegger |
#20
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OT - Power Pole Guy Wires
On Wed, 21 Mar 2012 12:46:09 +0000 (UTC), Tegger
wrote: "Doug" wrote in : Just so I make myself clear, yes there can be compression forces in a pole but a guy wire does NOT take them out. If anything, I'd think guy wires ADD compression to the pole, since they pull downwards as well as sidewards. correct. |
#21
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OT - Power Pole Guy Wires
On Mar 21, 7:55*am, "Doug" wrote:
On Wed, 21 Mar 2012 06:51:51 -0500, "Doug" wrote: On Tue, 20 Mar 2012 23:04:01 -0700 (PDT), DD_BobK wrote: On Mar 20, 1:28*pm, DerbyDad03 wrote: How do they determine where to place the guy wire for a power pole? They replaced 2 poles on my street this week. On one pole, they placed the guy wire perpendicular to the street, on the other it's parallel. In both cases, there is space to have put it either way, so I don't think "location" was the issue. In both cases, the prevailing wind will hit the poles from the same direction, so the guy wire placement can't be based on that. On the "perpendicular" pole there are wires that come to the pole from almost the opposite direction of the guy wire (as if the guy wire offsets the tension of the wires) but also a set of wires that leave the pole at a right angle to the guy wire. Those wires go to the other pole in question. On the "parallel" pole the wires come to and leave the pole in line with guy wire, so if the guy wire is offsetting the tension of one set, it's doing nothing for the other. Since there is nothing consistant in the placement of the guy wire for these 2 poles, they've got me curious. DD- I'm not sure I'm following your pole descriptions entirely correctly but generally speaking...... The forces applied (by the electrical wires) to a utility pole must be resisted by 1) bending forces in the pole (as in an un-guyed flag pole) 2) compression forces in the pole 3) tension in guy wires 4) a combination of 1), 2) or 3). Compression forces in a pole??? *How does a guy wire take out compression forces? * Engineer wannabee???? Just so I make myself clear, yes there can be compression forces in a pole but a guy wire does NOT take them out. *- Hide quoted text - - Show quoted text - Unless they use a Sky Hook. ;-) |
#22
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OT - Power Pole Guy Wires
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#23
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OT - Power Pole Guy Wires
On Mar 22, 12:29*pm, "Twayne" wrote:
, typed: On Tue, 20 Mar 2012 13:28:31 -0700 (PDT), DerbyDad03 wrote: How do they determine where to place the guy wire for a power pole? Since there is nothing consistant in the placement of the guy wire for these 2 poles, they've got me curious. Lke I said: all junk, almost all guesses from non-experenced dummies. Go to a group where you're not OT and get a realistic set of answers. Assuming you're not a troll, that is. |
#24
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OT - Power Pole Guy Wires
On 3/22/2012 11:29 AM, Twayne wrote:
In , typed: On Tue, 20 Mar 2012 13:28:31 -0700 (PDT), DerbyDad03 wrote: How do they determine where to place the guy wire for a power pole? Since there is nothing consistant in the placement of the guy wire for these 2 poles, they've got me curious. Lke I said: all junk, almost all guesses from non-experenced dummies. Go to a group where you're not OT and get a realistic set of answers. excuse me smartass, my answer was not junk. -- Steve Barker remove the "not" from my address to email |
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