Introductory technical guidance for electrical, civil and structural engineers interested in basic data for electrical power transmission lines. Here is what is discussed:1. FIELD DATA 2. SAFETY CODES 3. COST ESTIMATES 4. SELECTION OF TYPE OF CONSTRUCTION 5. NORMAL, RULING, AND EFFECTIVE SPANS6. SELECTION OF CONDUCTORS7. STRESS-STRAIN CURVES8. THE PARABOLA AND THE CATENARY9. DESIGN INSTRUCTIONS10. TRANSMISSION LINE DATA SUMMARY FORM.