Change List for this Rule

 

General Order 95

 

Appendix D

 

Typical Communication Line Construction


For a communication line carrying from approximately 6 to 20 conductors in a Light Loading area, the following specifications adequately meet all intents and requirements of this order:

 

Poles

 

Round, wood, butt–treated, 25 feet in length, minimum top circumference of 15 inches, and set to a depth of 4.5 feet in firm soil.

 

Crossarms

 

3–1/4 x 4–1/4 x 10’. Attached by means of through bolts and washers, with a 15 inches center line of pole clearance to nearest conductors. Standard 30 inches quarter braces installed on the face of the crossarm with 3/8 inch bolts and 1/2 inch drive screw at the pole.

 

Pins

 

1–1/4'' x 8'' wood pins.

 

Insulators

 

Pin type insulators to be of design that will engage the thread of the pin for not less than two and one–half turns.

 

Conductors

 

Size and material dependent upon the class of circuit involved. Sags as specified in Appendix C , Table 25 . The average span length is 150 feet.

 

Guys

 

For guying at angles or dead ends, it is recommended that a “Lead over Height” (ratio of the horizontal distance from the face of the pole to the point of entrance of anchor rod in the ground to the vertical height above the ground of the attachment of said guy wire to the pole) of 1 be used. At angles in the line where the pull of the line exceeds 4 feet, i.e., the angle of departure exceeds 5 degrees, a guy strand having a strength of l900 lbs (1/4 inch or greater) shall be used with the necessary pole shims, hook bolts, etc. (see Appendix G, Figure 86 ).

 

Hardware

 

All line hardware to be galvanized or of other corrosion resisting material.