Can anyone help me out? I am in the process of putting up a 85' tower. I am
presently looking into guy wires. The calculated maximum force on the guy
wires is 2990 lb. I decided that 5/16" EHS 1x7 wire should be fine. Now when I
receive quotes I find various grades (if the quoter even knows what grade it
is). Can somebody explain what the difference is? I see that EHS is recommended
by most tower manufacturer but why?
The strength of the different grades are mind boggling:
For 5/16" galvanized steel wire I have break force for:
Common Grade 3200
Siemens Martin Grade 5350
High strength Grade 8000
Extra High Strength Grade 11200
Utilities/Specification Grade 18000
(Obviously you need to know the grade. See "Common" compared to "Utility").
One of my questions is:" Can I use 9/32" Utilities Grade (11500 lb) instead of
5/16" EHS (11200 lb)? 11500 lb seems OK for a maximum expected force of 2990 lb
(120 mph wind)? What would happen if I use 5/8" Common Grade (11600 lb)?
Could I possible use 1/4" Utilities Grade (6000 lb) or is that to be too close
to the maximum force (2990 lb)?
Hans - N2JFS
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