Overhead Distribution Lines. Lawrence M. Slavin

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      1  Cover

      2  Title Page

      3  Copyright

      4  Dedication

      5  About the Author

      6  Preface

      7  Acknowledgments

      8  1 Introduction 1.1 Scope 1.2 Background

      9  2 Pole Structures 2.1 General 2.2 Wood Pole Strength 2.3 Loads 2.4 Embedment Depth 2.5 Guying 2.6 Column Buckling 2.7 Grounding and Bonding Notes

      10  3 Pole Installation and Maintenance 3.1 Pole Placement 3.2 Guys and Anchors 3.3 Pole Maintenance

      11  4 Wires, Conductors, and Cables 4.1 Categories 4.2 Messenger Wire/Strand 4.3 Electric Supply (Power) Cables 4.4 Communications Cables 4.5 Wireless Attachments

      12  5 Cable Installation 5.1 Conductor and Cable Placement 5.2 Lashing Operation 5.3 Overlashing Notes

      13  6 NESC^® Requirements (Strength and Loading) 6.1 National Electrical Safety Code (NESC) 6.2 Loading Requirements 6.3 Strength Requirements 6.4 Wire Tensions 6.5 Guyed Poles 6.6 Extreme Wind Loads (“60 ft Limit”) 6.7 Allowable Deterioration 6.8 Overlashed Cables 6.9 Software Tools and Pole Loading Analysis Notes

      14  7 NESC^® Requirements (Clearances) 7.1 Clearances 7.2 Clearance Zones 7.3 Clearances Above Surfaces and Buildings 7.4 Clearances Between Wires 7.5 Overlashed Cables Note

      15  8 Principles of Wire Sag 8.1 Catenary 8.2 Initial and Final Sag 8.3 Sag–Tension Relationship 8.4 Determining Change in Sag (and Tension) 8.5 Ruling Span 8.6 Point Load Note

      16  9 General Order 95 (California) 9.1 General Order 95 (GO 95) 9.2 Loading Requirements 9.3 Strength Requirements 9.4 Clearances

      17  10 Examples 10.1 Purpose 10.2 Tangent Line 10.3 Line Angle 10.4 Line Angle – Buckling Consideration 10.5 Additional Attachment 10.6 Summary Note

      18  Appendix A: Properties of Messenger Strands

      19  Appendix B: Wireless СКАЧАТЬ