Transcription of PART B-03 TITLE: OVERHEAD CONDUCTOR DISTRIBUTION ... - …
1 STANDARD SPECIFICATION FOR MEDIUM AND LOW VOLTAGE ELECTRICITY DISTRIBUTION WORKS PART B-03: OVERHEAD CONDUCTOR DISTRIBUTION , ABC, , , 11, 22, 33kV Infrastructure Technical Standards Page B-03:1 PART B-03 TITLE: OVERHEAD CONDUCTOR DISTRIBUTION (ABC, , , 11, 22, 33kV) SPECIFICTION NO: B-03, ABC, , , 11, 22, 33kV INCEPTION DATE: AFTER GAZETTING (WORKING DOCUMENT FOR A 3 YEAR PERIOD) AMENDMENTS / REVISIONS DATE PAGE PARAGRAPH DESCRIPTION ORIGINATOR APPROVED STANDARD SPECIFICATION FOR MEDIUM AND LOW VOLTAGE ELECTRICITY DISTRIBUTION WORKS PART B-03: OVERHEAD CONDUCTOR DISTRIBUTION , ABC, , , 11, 22, 33kV Infrastructure Technical Standards Page B-03:2 TABLE OF CONTENTS PAGE 1 SCOPE .. 5 2 TREE CUTTING .. 9 3 POLES .. 9 9 POLE SPACING .. 9 POLE PLANTING .. 9 POLE EARTHING .. 9 WOODEN POLES.
2 10 General specification .. 10 CONCRETE POLES .. 11 General .. 11 Design .. 11 Length, tip and butt dimension .. 11 Cover of reinforcement .. 11 Finish .. 11 Holes .. 12 Pole Strength .. 12 MONOPOLE STEEL STRUCTURES .. 12 Design .. 12 Paint and Finishing .. 12 4 STAY ASSEMBLIES .. 13 13 STAYWIRE .. 13 General .. 13 Stay wire for MV line .. 13 Stay wire for LV line .. 13 STAY ROD .. 13 STAY ROD BASE PLATE .. 14 Base plate for MV line stay rod .. 14 Base plate for LV line stay rod .. 14 PREFORMED STAY FITTINGS .. 14 General .. 14 Pole top make off .. 14 Preformed guy grips .. 14 STAY 14 STAY GUARDS .. 15 OTHER STAY ACCESSORIES .. 15 Cable clamps .. 15 Eye-bolt assembly .. 15 5 EXCAVATION .. 16 16 POLE HOLE EXCAVATION .. 16 STAY HOLE EXCAVATION .. 17 COMPACTING OF HOLES .. 17 ROCK ANCHORS .. 17 6 LINE CONFIGURATION.
3 18 STANDARD SPECIFICATION FOR MEDIUM AND LOW VOLTAGE ELECTRICITY DISTRIBUTION WORKS PART B-03: OVERHEAD CONDUCTOR DISTRIBUTION , ABC, , , 11, 22, 33kV Infrastructure Technical Standards Page B-03:3 18 Galvanizing .. 18 Bolts and nuts .. 18 A-FRAME CONFIGURATION .. 18 Strain A-frame .. 18 Intermediate A-frame .. 19 VERTICAL STAGGERED DELTA CONFIGURATION .. 19 Strain Staggered Delta .. 19 Intermediate Staggered Delta .. 19 7 LINE CONDUCTOR .. 20 20 CONDUCTOR SIZE .. 20 LINE JOINTS .. 20 MINIMUM ELECTRICAL CLEARANCES (VERTICAL CLEARANCES) .. 21 MINIMUM ELECTRICAL CLEARANCES (GUIDELINES FOR BUILDINGS AND PARALLEL LINES) .. 23 POWER LINE AND COMMUNICATION LINE CROSSINGS .. 23 8 INSULATORS .. 24 24 Types of insulators .. 24 Electrical design .. 24 Mechanical design .. 24 Clamps and CONDUCTOR fittings .. 24 STRAIN 25 Porcelain disc insulator.
4 25 Long rod insulator .. 25 INTERMEDIATE INSULATORS .. 25 Porcelain line post insulator .. 26 Cycloaliphatic line post insulator .. 26 MINIMUM INSULATION LEVELS FOR OVERHEAD LINES (EXTRACT FROM SANS 10280).. 27 9 LINE FITTINGS .. 28 PREFORMED BINDING TIES .. 28 PREFORMED DEAD ENDS .. 28 THIMBLE CLEVIS .. 28 PARALLEL GROOVE CLAMPS .. 28 10 AERIAL BUNDLE CONDUCTOR .. 29 ERECTION STANDARD .. 29 AERIAL BUNDLE CONDUCTOR .. 29 ERECTION OF ABC .. 29 ABC ERECTION TOOLS .. 30 Running-out blocks .. 30 Pulling socks .. 30 Come-alongs .. 30 Dynamometer (1000/2000kg) .. 30 Phase separator .. 30 Crimping tool .. 30 Swivel .. 30 Pilot rope .. 30 Recommended Minimum (but not limited to) kit .. 31 ABC ACCESSORIES AND MOUNTING HARDWARE .. 31 General .. 31 Low voltage suspension assembly .. 31 Bundle strain lamp Dead end assembly for ABC cable .. 31 Pigtail bolt assembly.
5 32 STANDARD SPECIFICATION FOR MEDIUM AND LOW VOLTAGE ELECTRICITY DISTRIBUTION WORKS PART B-03: OVERHEAD CONDUCTOR DISTRIBUTION , ABC, , , 11, 22, 33kV Infrastructure Technical Standards Page B-03:4 Eyebolt assemblies and fishplates .. 32 Pre-insulated junction sleeves .. 32 End caps .. 32 Cable ties use with ABC .. 32 Tap-off connectors .. 32 Strapping to pole of ABC ends .. 33 ABC to underground cable joint .. 33 STANDARD SPECIFICATION FOR MEDIUM AND LOW VOLTAGE ELECTRICITY DISTRIBUTION WORKS PART B-03: OVERHEAD CONDUCTOR DISTRIBUTION , ABC, , , 11, 22, 33kV Infrastructure Technical Standards Page B-03:5 1 SCOPE (a) This part of the specification deals with the erection and commissioning of a complete OVERHEAD transmission line which comprises of bare or insulated OVERHEAD CONDUCTOR , wooden, steel or concrete poles, stay assemblies, insulators, strain and suspension clamps.
6 (b) Bare OVERHEAD transmission in built-up areas shall as far as possible be avoided, especially on the low voltage side. (c) This specification shall be read in conjunction with the following referenced standards: GENERAL INFORMATION The following Standards and Acts shall take precedence: National Electricity Act of Namibia Occupational Health and Safety Act of Namibia Labour Act of Namibia Quality of Service Standard Quality of Supply Standard NamPower Specifications for the Erection of OVERHEAD Power Lines NamPower Specifications and General Conditions for Survey and Route Clearing for New Power Lines The following Standard shall be used as reference: NRS 033 : Electricity DISTRIBUTION Guidelines for the application design, planning and construction of medium voltage OVERHEAD power lines up to and including 33kV, using wooden pole structures and bare conductors.
7 NRS 034 : Guidelines for the provision of electrical DISTRIBUTION networks in residential areas. NRS 043 : Code of practice for the joint use of structures for power and telecommunication lines NRS 059 : Recommendations to minimize problems associated with the theft of transformer neutral and neutral earthing copper conductors NRS 060 : Code of practice for clearances for electrical systems with rated voltages up to and including 145kV, for the safety of persons NRS 082 : Recommended maintenance policy for electricity networks SANS 10280 : OVERHEAD power lines for conditions prevailing in South Africa STANDARD SPECIFICATION FOR MEDIUM AND LOW VOLTAGE ELECTRICITY DISTRIBUTION WORKS PART B-03: OVERHEAD CONDUCTOR DISTRIBUTION , ABC, , , 11, 22, 33kV Infrastructure Technical Standards Page B-03:6 OVERHEAD CONDUCTORS Regional Standards SANS 182-1 : Conductors for OVERHEAD electrical Transmission line part 1.
8 Copper wires and stranded copper conductors (metric units) SANS 182-2 : Conductors for OVERHEAD electrical Transmission line part 2: Stranded aluminium conductors SANS 182-3 : Conductors for OVERHEAD electrical Transmission line part 3: Aluminium conductors, steel reinforced SANS 182-5 : Conductors for OVERHEAD electrical Transmission line part 5: Zinc-coated steel wires for conductors and stays. SANS 1418-1 : Aerial bundled CONDUCTOR system Part 1: Cores SANS 1418-2 : Aerial bundled CONDUCTOR system Part 2: Assembled insulated CONDUCTOR bundles SANS 1713 : Electric cables Medium voltage aerial bundled conductors for voltages from to 19/33kV NRS 020 : Cable ties for use with ABC NRS 018 : Fittings and connectors for low voltage OVERHEAD power lines using ABC. International Standards BS EN 13601 : Specification for copper for electrical purposes. IEC 60889 : Hard Drawn Aluminium Wire for OVERHEAD Conductors IEC 61089 : Round Wire Concentric Lay OVERHEAD Electrical Stranded Conductors.
9 IEC 62219 : OVERHEAD Electrical Conductors Formed Wire, Concentric Lay , Stranded Conductors INSULATORS Regional Standards NRS 066 : Medium voltage insulators SANS 60273 : Characteristics of indoor and outdoor post insulators for systems with nominal voltages greater than 1000V. SANS 60305 : Insulators for OVERHEAD lines with nominal voltage above 1000V ceramic of glass insulator unit for systems characteristics of insulator units of the cap and pin type. STANDARD SPECIFICATION FOR MEDIUM AND LOW VOLTAGE ELECTRICITY DISTRIBUTION WORKS PART B-03: OVERHEAD CONDUCTOR DISTRIBUTION , ABC, , , 11, 22, 33kV Infrastructure Technical Standards Page B-03:7 SANS 60383-1 : Insulators for OVERHEAD lines with nominal voltage above 1000V. Part 1: Ceramic or glass insulator units for systems definitions, test methods and acceptance criteria.
10 SANS 60383-2: Insulators for OVERHEAD lines with nominal voltage above 1000V. Part 2: Insulator strings and insulator sets for systems definitions, test methods and acceptance criteria. BS EN 60305 : Insulators of ceramic material or glass for OVERHEAD lines with a nominal voltage greater than 1000 V. Requirements SANS 60720 : Characteristics of line post insulators SANS 60815 : Guide to the selection of insulators in respect of polluted conditions SANS 61109 : Composite insulators for OVERHEAD lines with a nominal voltage greater than 1000V Definitions, test methods and acceptance criteria. SANS 61462 : Composite insulators Hollow insulators for use in outdoor and indoor electrical equipment Definitions, test methods, acceptance criteria and design recommendations. International Standards BS 3288 : Insulator and CONDUCTOR fittings for OVERHEAD power lines.
