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General Order 64


Appendix B


Mechanical And Loading Data For Conductors.


This appendix gives, in the form of tables, mechanical data for copper wire, steel wire and cable most commonly used in electrical supply lines; also wind and ice loads which will be encountered under conditions of maximum loading as outlined in Section V, Rule 52.


The curves of Appendix C are based on the values given in the tables below, together with the following data:


Modulus of elasticity



16,800,000 pounds per square inch

Steel Solid

29,000,000 pounds per square inch

Steel, stranded

21,000,000 pounds per square inch


Coefficient of linear expansion



0.96 X 10-5 per degree F.


0.67 X 10-5 per degree F.