TM
5-811-1/AFJMAN
32-1080
USING VALUES BELOW
IN FORMULAS BELOW
APPLY NESC FACTORS
Required guy strength = (P) x (Overload) (Safety)
(10-5)
EXAMPLE
Three No. 1 AWG copper-equivalent ACSR conductors installed in a light
Given:
loading district in a vertical configuration with the guy connected
at a lead angle of 45" and at the same height as the center conductor.
(10-1)
Tc = 1,480 pounds a given in table 6-3
Then:
T
= 3 x 1,480 pounds = 4,440 pounds
(10-2)
P
= 4,440 pounds 0.707 = 6,280 pounds
(10-4)
Required guy strength = (6.280 x 1.5) 0.9 = 10,466 pounds
(10-5)
Use:
3/8 inch, 7 strand, utilities grade, zinc-coated, steel strand
with a minimum breaking strength of 11,500 pounds (ASTM A 475)
Keller & Gannon
a
Courtesy of
Figure 6-10. An Example of an In-Line Guy Strength Analysis.
6-18
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