REPUBLIC OF RWANDA Ministry of Infrastructure ENERGY WATER AND SANITATION AUTHORITY (EWSA) Electricity Access Rollout Programme (EARP) Head Office: Avenue de l’ Ihema, P.O.Box 537, Kigali-Rwanda Tel: +(250)252573666 Fax: +(250)(0)252573802 E-mail: [email protected] Website: www.ewsa.rw PROJECT BRIEF FOR THE INSTALLATION OF LOW VOLTAGE AND MEDIUM VOLTAGE LINES AND SERVICE CONNECTIONS IN BUNGWE – KIVUYE - GATEBE AREA IN BURERA DISTRICT December 2011 1 LIST OF ACRONYMS ............................................................................................................ 5 0. BACKGROUND .................................................................................................................. 6 I. DESCRIPTION OF THE PROJECT ................................................................................. 8 I.1. INTRODUCTION ........................................................................................................................... 8 I.2. OBJECTIVES OF THE PROJECT ............................................................................................... 8 I.3. PROJECT ACTIVITIES ................................................................................................................ 9 I.4. CONSTRUCTION PROGRAMME ..............................................................................................10 I.5. TECHNICAL DESCRIPTION ......................................................................................................10 Description of Works ..................................................................................................... 10 Line Profiling ..................................................................................................................... 11 Scope ...............................................................................................................................................11 Environmental Data ........................................................................................................................12 Safety Precautions ..........................................................................................................................12 Quality Assurance ...........................................................................................................................13 Packing and Shipping .....................................................................................................................13 Packing ...................................................................................................................................................... 13 Shipping or Inland Transportation .......................................................................................................... 14 Hazardous Substances ...................................................................................................................14 STANDARDS AND SPECIFICATIONS ........................................................................... 14 LOW VOLTAGE AERIAL BUNDLE CABLES (600/1000V) ..................................... 14 CABLE DESIGN ...............................................................................................................................15 Conducting cores ...................................................................................................................................... 15 Insulating sheath ....................................................................................................................................... 15 SPECIFICATIONS ............................................................................................................................15 600/1000V GENERAL PURPOSE LV CABLES ........................................................... 16 Conductors ......................................................................................................................................16 Insulation .........................................................................................................................................16 Armouring ........................................................................................................................................16 Oversheath ......................................................................................................................................16 Core Identification ...........................................................................................................................16 CABLE OVERSHEATH ....................................................................................................................16 LV SERVICE DROP CABLES ............................................................................................ 16 CABLE DESIGN ...............................................................................................................................17 Characteristic requirements .................................................................................................................... 17 CONDUCTOR CHARACTERISTICS ................................................................................................17 15KV DISTRIBUTION TRANSFORMERS .................................................................... 17 STANDARDS ....................................................................................................................................18 30KV DISTRIBUTION TRANSFORMERS .................................................................... 18 STANDARDS ....................................................................................................................................18 TRANSFORMER LV DISTRIBUTION BOX .................................................................. 18 2 LV DB ...............................................................................................................................................18 15KV SURGE ARRESTORS.............................................................................................. 19 STANDARDS ....................................................................................................................................19 CHARACTERISTICS OF NETWORK ..............................................................................................19 30KV SURGE ARRESTORS.............................................................................................. 20 STANDARDS ....................................................................................................................................20 30KV INSULATED FUSE CUTOUTS .............................................................................. 20 STANDARDS : .................................................................................................................................20 WOOD POLES ..................................................................................................................... 20 NORMATIVE REFERENCES ...........................................................................................................21 PRESERVATIVE TREATMENT .......................................................................................................21 Wood specie and preservative treatment: ............................................................................................ 21 CONCRETE POLES ............................................................................................................ 22 NORMATIVE REFERENCES ...........................................................................................................22 STEEL POLES ...................................................................................................................... 22 STANDARDS: ..................................................................................................................................22 SETTING OUT AND ERECTION ..................................................................................... 23 General .............................................................................................................................................23 Planting Depth .................................................................................................................................24 Backfill and Compaction ................................................................................................................24 Pegging of Structure Positions ......................................................................................................24 Site Preparation ...............................................................................................................................25 Protection of Natural Vegetation ...................................................................................................25 CONSTRUCTION ................................................................................................................ 26 II. DESCRIPTION OF THE ENVIRONMENT ................................................................ 28 II.1. DESCRIPTION OF THE PHYSICAL ENVIRONMENT: METEOROLOGY, HYDROGRAPHY, GEOLOGY, RELIEF AND BIODIVERSITY ......................................................................................28 DESCRIPTION OF THE ENVIRONMENT ..................................................................... 29 Description of the Physical Environment: Meteorology, Hydrography, Geology, Relief and Biodiversity ......................................................................................................................................29