Encyclopedia of Anchoring (CA06114E)

DETERMINING GUY LOADS

Factors to be considered in guying pole lines are: the weight of the conductor, the size and weight of cross arms and insulators, wind pressure on poles and conductors, strains due to the contour of the earth, line curvatures, pole heights and deadend loads, plus the vertical load due to sleet and ice. To reduce unbalanced stresses to a minimum, correct angling and positioning of guy wires is essential. Where obstructions make it impossible to locate a single guy in line with the load or pull, two or more guys can be installed with their resultant guying effort in line with the load. Where lines make an abrupt change in direction, the guy anchor is normally placed so it bisects the angle formed by the two extended tangents. Under heavy load conditions, it may be necessary to use two anchors, each deadending a leg of the line load along the extended tangents. Long straight spans require occasional side and end guys to compensate for heavy icing and crosswinds on conductors and poles. These, and all other factors that might make it advisable to use guys, should be carefully considered in initial designs for line construction. Line Loads On Deadends To compute the load on the guy, the line load must first be determined. When the line is deadended, the line load can be calculated by multiplying the ultimate breaking strength of the conductor used (S) times the number conductors (N). For example, if three 1/0 ACSR conductors are deadended on a pole, the line load will be 12,840 pounds:

S x N = Line Load

4280 x 3 = 12,840

The ultimate breaking strength of selected conductors is found in the Guy Strand Reference table.

Line Loads On Angle Lines To determine the line load to be guyed on a single anchor where the line changes direction, multiply the ultimate breaking strength of the conductor used (S) times the number of conductors used (N), then refer to the Angle Load Reference sheet. Locate your line load in pounds. Read across until under angle change of line direction in degrees, then read your line load to be guyed in pounds.

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