Terminology used in this specification has been simplified in order to provide consistency. Referring to the owner can also mean the owner's representative or engineer.

The owner is responsible for completing this specification and adding other information, drawings and supplemental requirements as appropriate. It may be necessary for the owner to modify this specification in order to consider special applications or preferences.

B. Scope: This purchase specification covers the technical aspects of design, materials, manufacturing, inspection, testing, and delivery of direct embedded standard class spun prestressed concrete poles. It is recommended that this specification be limited to poles which are not guyed, not subjected to unbalanced lateral loads, or do not have deflection limitations or other special limitations. For concrete pole applications which consider these items, it is recommended that the owner use Guide Specification for Spun, Prestressed Concrete Pole and Concrete Pole Structures, RUS Bulletin 1724E-206. This specification does not include front-end documents or specifications for construction. The owner needs to add front-end documents including instructions to the bidders and general conditions. This specification may be expanded to include H-frame structures.

C. Initial Design Considerations: There are several engineering decisions required of the user of this specification to determine which standard class concrete poles to specify. Some examples include, but are not limited to:

• Amount of foundation rotation and deflection to consider for incorporating P-delta moments;
• Location of point of fixity;
• Embedment depths;
• Load cases to be considered in addition to those required by the National Electrical Safety Code (NESC); and
• Deflection limitations.

Prior to the selection of a standard class pole, the user should perform the engineering required for these types of issues or employ an engineering consultant to do so. See Appendix A for a discussion of some of these items.

D. Information to be Completed by the Owner - When using these specifications the owner should detach sheets 1a to 8a and the Commentary, and add or complete the following:

D.1 Documents and general information to be added to the technical specification: The following front-end documents and general information need to be added to this technical specification:

It is recommended that RUS Form 198 be used for competitive bidding. This form covers Notice and Instructions to Bidders, Proposal, and Equipment Contract. Other supplemental information which the owner may want to add includes Bid Submission, Bid Price and Schedule, Bid Acceptance Period, Bid Requirements, Bid Data, and Bidder's Qualifications. A section on General Conditions could include such items as Definition of Terms, Inspection and Acceptance, Interpretation of Bid Documents, Addenda to the Bid Documents, Insurance, Method of Payment (if Form 198 is not used), Quantities, and Tabulation of Unit Prices.

a. Configuration requirements and other information (Attachment A of the specification or equivalent):

(1) Structure dimensions;

(2) Conductor support (type, holes, orientation and height);

(3) OHGW support (type, holes, orientation and height);

(4) Underbuild support (type, holes, orientation and height);

(5) Embedment depths; and

(6) Other hole locations and/or requirements.

b. Strength requirements - Standard class designations for spun concrete poles, which include ultimate loading and ultimate strength requirements.

This specification establishes standard concrete pole sizes. The appropriate standard class pole from Section 4 needs to be selected by the engineer.

In the calculations to select the standard class pole, the engineer should use minimum design loads which meet NESC requirements appropriate for the loading district, any local codes, the NESC extreme wind load provisions, and any necessary extreme ice and wind conditions with the appropriate overload factors. The design loads account for all loading cases including wind on pole and secondary stresses from foundation deflection and rotation, and from vertical loads acting on lateral pole deflection (P-delta effect).

ASCE Guidelines for Transmission Line Structural Loading can be used for developing loads produced by climate, accidents, construction and maintenance. Calculations need to include the vertical, transverse, and longitudinal loads with wind on the structure and the dead weight of the structure for any given loading condition applied simultaneously.

(1) Location of climbing and/or working devices and the quantity of each to be supplied with the poles.

(2) Delivery schedule, F.O.B. location, and name, address, and telephone number of the owner's contact.

(3) Additional requirements. Additional items such as special pole color (stain, paint, or dye additive), location of bolt holes for other attachment requirements, grounding requirements, cant holes, switch operating mechanisms, etc.

(4) Pole tests required.

a. Calculated weight of each concrete pole;

b. For each standard class pole ultimate loading, provide section and strength properties, including the ultimate, cracking and zero tension moments and deflections, at maximum five foot intervals along the pole;

c. Pole diameter at top, bottom, and groundline;

d. Tip and butt wall thickness;

e. Prestress strand - quantity, size and dropout location;

f. 28-day compressive strength of concrete; and

g. Diameter taper (in/ft).

a. Type of material of major components (ASTM number and grade);

b. Quantity, size and grade of prestressing strands or other reinforcement;

c. Description of pole including thickness, length, diameter, and taper; and

d. Design exceptions.