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  #21  
Old 08-15-2013, 07:59 PM
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Mike Leary Mike Leary is offline
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Originally Posted by Wet_Boots View Post
I'll wait to see the side-by-side comparisons of coiled and uncoiled wire after a ground strike. Absent that, I remain a skeptic, because the inductance of coiled irrigation wire (it is inductance that blocks a voltage spike) is going to be close to zero.
A shunt wire from the coil to Boot's privates should prove the theory.
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  #22  
Old 08-15-2013, 09:33 PM
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How about an over-under number for the inductance of your coiled wire?
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  #23  
Old 08-16-2013, 01:52 AM
Stillwater Stillwater is offline
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Originally Posted by Wet_Boots View Post
Outside of ancient radio circuits, I can't picture inductors that are simply coils of wire with an air core. Are they sometimes employed in speaker crossovers?
In audio Yes,,, simply because air coils are unaffected by the current they are carrying. A ferro coil will peak early during a moderate power event and then drop and introduce a harmonic artifact. In hifi you don't want distortion in the network. With air coils you have better power handling higher efficiency and operate near the 1ghz frequencies Ferromagnetic coils can suffer from iron loss also sometimes called copper loss at higher frequencies, not all but most ferro coils will loose it above 100 mhz.
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  #24  
Old 08-18-2013, 07:50 PM
irrig8r irrig8r is offline
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Originally Posted by 1idejim View Post
1/2 inch pipe. It's done as a measure of safety against lightning
Really? Never heard that reason. I've always done it to allow a solenoid enough slack to pull it out of the box if needed when servicing, yet keep the wires neat in the box. And I've never heard of a lightning ground strike around here in my 30+ years in the business.
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  #25  
Old 08-18-2013, 08:59 PM
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Originally Posted by irrig8r View Post
Really? Never heard that reason. I've always done it to allow a solenoid enough slack to pull it out of the box if needed when servicing, yet keep the wires neat in the box. And I've never heard of a lightning ground strike around here in my 30+ years in the business.
Derryberry and Lefty both feel the coils work. I don't know Derryberry but i have read his book. Lefty didn't write a book but he did teach me a lot about sprinklers.

I can't say that coils work and i can't say that they do. What i can say is, i would rather use the coils and never find out they work than not use them and have a strike or spike damage and wonder, what if???

As far as no ground strikes in your area, you're in a good place. We get them often enough in Jeff.

In '73 a cowboy and his horse were struck and killed while working a gate (in the Hollister hills i believe) . I don't remember his name right now but i remember it was his 21st birthday.
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  #26  
Old 08-19-2013, 06:55 AM
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Originally Posted by irrig8r View Post
And I've never heard of a lightning ground strike around here in my 30+ years in the business.
Did one last week. ICC blown right off the back of a barn. 6 solonoids and 80 ft of wire.
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  #27  
Old 08-19-2013, 01:47 PM
Stillwater Stillwater is offline
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Did one last week. ICC blown right off the back of a barn. 6 solonoids and 80 ft of wire.
AI did you happen to snap any pictures ?
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  #28  
Old 08-19-2013, 03:18 PM
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No. havnt plugged my camara in in over a yr.
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  #29  
Old 08-19-2013, 03:24 PM
Stillwater Stillwater is offline
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A smoldering icc would make nice wall paper
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  #30  
Old 08-19-2013, 04:13 PM
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I'm tempted to set up a lightning rod connected to a controller and record video.
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