09 ok LIGHTING AND POWER SUPPLY WORKS

CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 LIGHTING AND POWER SUPPLY WORKS 1/ 17 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 TABLE OF CONTENTS I REFERENCE STANDARDS II MATERIALS III LIGHTNING PROTECTION IV WIRING FOR LIGHTING V CABLE AND WIRE VI GROUNDING VII CONDUIT PIPE VIII CABLE TRAY AND MOUNTING BRACKET FOR CABLE TRAY IX ELECTRICAL SPLICE MATERIALS X EXECUTION OF THE WORK XI CONSTRUCTION REQUIREMENTS XII CONSTRUCTION 2/ 17 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 I REFERENCE STANDARDS The work covered by this specification shall be carried out in accordance with the regulations issued by the local Electricity Authority and with the following applicable standards and codes as appropriate: QCVN 07:2010/BXD: Building code Infrastructure; - Urban QCVN 20:2010/BGTVT: National technical regulation on aids to navigation; QCVN 39-2011/BGTVT National technical waterway signaling; code Engineering on inland QCVN 41:2012/BGTVT National Technical Regulation on Road Signs and Signals; TCVN 46:2007 Protection of Structures Against Lightning - Guide for design, inspection and maintenance; TCVN 4756:1989 Specification on grounding for electrical equipment; TCVN 7447-5-51:2010: Installation system of low voltage – Part 5-51 Selection and installation of electric facilities – General rules; TCVN 7447-5-52:2010: Installation system Power line installation system; of low voltage – TCXDVN 333:2005 Design standards of artificial outdoor lighting for public buildings and urban infrastructure; TCXDVN 259:2001 Design standards for artificial lighting for urban roads, streets and squares; TCXDVN 319:2004 Earthing system installation for industry construction; 11 TCN 18-19-20-21:2006 Electrical installation regulations in Viet Nam; IALA International Association of Lighthouse Authorities; IEC 62305-1,2,3 International Standard for protection against lightning; Regulations and requirements pertaining to navigation signals for vessels shall be in accordance with international rules in accordance with the QCVN 20:2010/BGTVT, QCVN 39-2011/BGTVT and “IALA” requirements and recommendations 3/ 17 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 Regulations and requirements for lightning rods and associated grounding systems, using the rolling sphere method for lightning protection, shall be in accordance with all of the Regulations issued by the local Electricity Authority and reference:   II TCVN 9385:2012; IEC 62305-1; MATERIALS LIGHTING UNITS Lighting units as shown on the Drawings shall consist of lighting lantern, lamps, electrical control ballast(s), and mounting accessories Lamps for the bridge (BR), Main roads (MR), Access road to Toll plaza (AC), External Toll Plaza (TP), National Highway (NH), Province Road (PR) and Interchange (IC) shall be highpressure sodium type The Contractor shall submit for approval, detailed light distribution diagrams for each type of lantern he proposes to install Furthermore, calculations shall be submitted showing the illuminance in candela per sq.m (cd/m2) at street level for carriageway, loop and ramp of interchange, and in lux at toll plaza areas LIGHTING CONTROL PANELS The lighting panels shall be included as feeders of the power source fed to the circuits of the street and bridge lighting and the guide signs The panels shall be as shown on the Drawings or equivalent as approved by the Engineer SUBSTATION All power supply for lighting shall be as shown on the Drawings The components shall be designed for 3-phase 4-wire, 50 Hz operation at 415/240 volts The components shall be in accordance with the Power Supply Company’s Standards and Vietnam Standards: a) Distribution Panel b) Lightning Arrestors c) Fuses Cut-out d) Transformers e) Low Voltage Power Cable from Transformer to Distribution Panel f) Concrete Poles and support fixtures g) Overhead Medium Voltage Cables from existing distribution line including support and insulators NAVIGATION LIGHT General locations are indicated on the drawings The Contractor shall propose the exact location to the Engineer for his approval (a) Lighting Units Lighting units shall be flashing lights with swivel suspension They shall be provided complete with a battery box, rechargeable DC power storage batteries (having a minimum operating time of two hours without charging), a control box with necessary breakers, a terminal board and all accessories and cables needed to provide a complete operational system 4/ 17 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 Lighting units shall be securely fixed to the edge beam or soffit of the bridge The navigation light shall have volts watts with 32 high LED in accordance with the Vietnamese Standards The lighting unit shall be a bracket-mounted or ceiling mounted type The minimum class protection shall be IP 54 for the entire optical unit which shall be suitable for a humid tropical environment Lens of lighting units shall be organic optical and UV resistance with D140mm diameter The body of luminaire shall be polycarbonate and solar panel, battery built-in one Description Visible distance Specification 8km 32 high LED, depend on Source of light colour Effective intensity & Colour Green; 55Cd; White, red, light yellow: 38Cd Horizontal out put 3600 Vertical divergence 6.50 at 50% intensity 200 mode according to code Flashing mode QCVN20:2010/BGTVT, standard 22 TCN 269-2000 and IALA Exact flashing mode +/-1% On/ off level 70/150lux Steady on: days Flashing (Fl Time of automotive 5s ):33days Sealed battery (6V-10Ah)x2 Working life of battery years Solar battery 9W, single crystal solar panel Flashing circuit BH998 P3 Pulse charging circuit T=0.25s Temperature range -400 -:- 600 C operation Dimensions 222x222x302mm Weight 5.3kg (b) Flashing Lights Lighting units shall be flashing type, white, and green or white, green and red (as indicated on the Drawings) that flash on and off at regular intervals at the same intensity with an on-of time of more than two seconds Effective intensity shall not be less than 38 candela (c) Stand-By Battery Battery (ies) shall be rechargeable, fully sealed, lead-acid, maintenance free with a volt 10Ah capacity with sets for each lighting unit LIGHTING POLES Lighting poles shall be galvanised steel, in accordance with the details shown on the Drawings, as outlined herein and in accordance with the requirements of Specification section 08800 5/ 17 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 All materials shall be in natural colour and shall not be painted or coated with any other material All pole items shall be galvanised steel and all hardware shall be galvanised steel Scratches, marks, dents or other damages to poles and fittings shall be cause for rejection Any marks or stains resulting from wrapping materials shall be removed All poles shall be individually spiral wrapped and in addition, shall be packed for shipping in groups with suitable form fitting wood dunnage between all poles and completely around each group at a minimum of locations, and held with suitable metal strapping Packing not in conformance with this provision shall be cause for rejection of poles All loading and unloading of poles shall be under the supervision of the manufacturer and/or Contractor All miscellaneous pole line hardware required to complete the project shall be standard material manufactured for pole line construction All poles supplied shall be of the anchor base type, and shall have a cast steel anchor base fitted over the shaft and secured with two circumferential welds All metal parts shall be hot-dip galvanized as stipulated under Specification section 08800 The hand hole and servicer door for the terminal connection shall be 1.0 meters above ground level This door shall be attached to each lighting pole by hinge strap HIGH MASTS The masts shall be made of steel folded in welded in one longitudinal seam The sections means of bolts If bolted joints are used, aesthetics of the silhouette of the mast and inside the mast conical sections, automatically shall be telescopic jointed or by flanges shall not disturb the should preferably be positioned The steel parts of the mast shall be hot dip galvanised over their entire surface in accordance with the requirements of Specification section 08800 After installation of the mast, all exposed anchor bolts and securing nuts on the foundation shall be given one coat of an approved bituminous paint All scratches and other damage of the finish occurring during transport or installation works shall be thoroughly cleaned and touched up The masts shall be bolted on a reinforced concrete foundation by means of steel bolts and nuts of adequate diameter and quantity The foundation shall be made of concrete and rolled steel bars in accordance with the applicable requirements of this Specification For the maintenance purpose of lanterns and exchange of lamp, the position of lanterns bracket shall be operated by motor and/or hand from top to bottom The masts shall have a lockable access door at ground level The lamp accessories such as fuses, ballasts, ignitors and capacitors shall be mounted on a suitable frame and installed inside the mast at ground level Provisions shall be made that no moisture, either from condensation or from entering rain water will drip on the lamp accessories Rising cables from the accessories to the lamps shall be bunched and fixed in the mast Near the accessory frame inside the mast an earth terminal of at least M10 diameter shall be provided, directly welded to the mast At the top of the mast a head frame shall be provided suitable to receive the lightning fittings in quantities and directions as shown on the drawings 6/ 17 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 The mast shall have a harmonious silhouette and the Contractor shall submit for approval, full information on the shape and detailed dimensions of the proposed masts Before manufacturing the masts, the Contractor shall provide calculations and obtain the Engineer's approval for detailed construction drawings of the mast The calculations shall cover the complete structure, including head frame and lanterns, and shall show that: III  No parts of the assembly are submitted to stresses above acceptable limits,  The deflection caused by dynamic forces does not exceed acceptable limits; and LIGHTNING PROTECTION (a) General This section gives requirements and procedures applicable for the furnishing and installing all materials, and equipment necessary to complete installation of lightning rods, with arresting system in accordance with the drawings All lighting rods and arresting systems, including materials and accessories shall be in accordance with the following, which are incorporated as an integral part of this Specification:  TCVN 46:2007 Protection of Structures Against Lightning - Guide for design, inspection and maintenance;  IEC 62305-1,2,3 International Standard for protection against lightning; The location of each facilities and appurtenances shown on the Drawings are approximate and the Contractor shall propose the exact location to the Engineer for approval (b) Lightning Rods Lightning rods shall consist of metallic body made of stainless steel alloy used for receiving a lightning stroke directly and be connected to earth electrode by lightning conductors (c) Lightning conductor The lightning conductor that connects the lightning receiving parts with earth electrodes, to pass the lightning current shall be annealed flat copper bar 25mmx3mm, copper stranded wire of D10mm or strip or tubes which conform to requirements The down conductor shall be copper 25mmx3mm and be protected on the surface of the reinforced concrete pier The combined value of earthing resistance of foundation of the object to be protected and that of earth electrode shall be not more than  (d) Earth Electrode for Lightning The earth electrode shall be a copper plate of 5mm thick, 1.0m x 1.0m with a 1.5m length of annealed flat copper bar 25mmx3mm IV WIRING FOR LIGHTING All cables to be used for roadway lighting shall be of the type and size shown on the Drawings 7/ 17 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 Cables shall be pulled into a pole through pipes prepared in the foundation of the pole, and shall be connected to the terminals in the terminal box installed in the pole All poles shall include an approved miniature circuit breaker rated at 2P amperes, 240 volts, installed in the base of each pole and accessible through the service door of the pole The circuit breaker shall protect both the pole cables and the electrical control ballast Cables installed in the pole shall have three conductors of minimum cross section of 2.5mm as prescribed in "Cable and Wire" herein Cables shall be adequately attached to the lantern so that lantern terminals shall be free from carrying their weights Roadway lighting cables shall be two (2) core through to the last pole Roadway lighting control cables for reduce capacity of lamp shall be four (2) core through to the last pole, with conductors of minimum cross section of 6mm V CABLE AND WIRE All cables shall be suitable for operation at the specified voltage in open, duct or conduit, under the condition that the maximum conductor operating temperature at rated current shall be less than 70C Cable colours shall comply with Vietnam Standards or other approved colour code standards Cables shall be delivered to the Site on substantial non-returnable wooden drums, each bearing a securely fixed label stating gross weight, serial number, length of cable and other description Covers shall be provided around the periphery of the drum in order to protect the cable in transit and the inner cable end shall be adequately protected by a metal guard or other approved means Both ends of the cable shall be sealed by a suitable method to prevent the entrance of moisture All cables inside of the lighting pole from electric panel to lantern shall have three conductors per lantern Cables shall be 600 volts, grade "Polyvinyl Chloride Insulated and Sheathed Cable (CVV)” or shall be of the type approved by the Engineer All cables for the roadway lighting system to be installed underground shall be XLPE insulated, Double Steel Tape Armouring (DSTA) and PVC sheeting type Cu-XLPE/PVC/DSTA/PVC (CXV-DSTA) or equal approved by the Engineer Conductors shall have a minimum cross-sectional area of 6mm for use in underground installations All cables shall be delivered with an appropriate approved by the Engineer before installation VI test certificate and GROUNDING Metal conduit, steel poles and cabinets shall be made mechanically and electrically secured to form a continuous system and shall be effectively grounded Bonding and grounding jumpers shall be copper wire of the same cross-sectional area for all systems Bonding jumpers shall be used in all non-metallic boxes Metallic boxes shall employ hubs of double lock-nuts and bushes The bonding of all conduits, lighting poles and panels to form a continuous ground system shall be in 8/ 17 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 accordance with applicable code standards Lighting poles in embankment sections shall be individually grounded by a grounding rod Size of grounding wire shall be minimum 10mm2 Bare Copper Conductor (BCC) or equivalent subject to approval by the Engineer Ground rods shall be copper 16 dia x 2,400 millimeter minimum, depth 0.7 meter below finished grade and thermo-welded or connected using connection hardware to the 10mm2 grounding wire The Contractor shall investigate each site and measure the grounding resistance of the sites After taking the data, the Contractor shall provide the data to the Engineer and obtain his approval before installation The grounding resistance shall be 10 ohms or less, or as approved by the Engineer Details of all grounding points shall be submitted to the Engineer for approval VII CONDUIT PIPE Conduit to be installed below ground, above ground, in the concrete or on the surface of structures shall be flexible conduit pipe type HDPE (High Density Polyethylene) Cable pipes installed below ground are termed as ducts and are dealt with in Conduit Pipe Conduit to be embedded in concrete shall be HDPE in accordance with the requirements of TCXDVN 7997:2009 VIII CABLE TRAY AND MOUNTING BRACKET FOR CABLE TRAY All details regarding requirements, material and installation of cable trays shall be as shown on the Drawings The Contractor shall design and provide necessary cable trays for the locations indicated on the drawings The trays shall be securely fixed so that distance between the supports is less than meters The cable trays shall be made of hot dip galvanized steel For cable tray installed in exposed locations, the cable tray, and all mounting bracket fittings shall be of the highest quality for durability IX ELECTRICAL SPLICE MATERIALS Splices and taps shall be made with pressure type solderless connectors to securely joint the wares both mechanically and electrically An epoxy resin, cast type insulation shall be formed in clear plastic moulds The material used shall be compatible with the insulation specified in the Contract Drawings or this Specification Materials to be used for the work shall conform to the requirements of JIS C2804, C2805 and C2806, or shall have the quality approved by the Engineer Insulating tape when specified for use in splice formation shall conform to JIS C2336 Unfused quick disconnect connectors such as In-line connectors or Tee connectors shall be of quality approved by the Engineer X EXECUTION OF THE WORK The actual fabrication, installation, and testing of the work described in this Specification section shall be carried out by trained and experienced personnel 9/ 17 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 who are familiar with the requirements for this work and with manufacturer’s recommendations for installation of the specified items the All work shall comply with the Drawings, this Specification section and the codes, regulations and requirements stipulated in this Specification section or by the relevant Vietnamese Authorities LIGHTING UNITS Lighting units as shown on the Drawings shall consist of lamps, canopy, body, electrical control ballasts, and mounting accessories The Contractor shall submit for approval light distribution diagrams for each type of lantern he proposes to install Unless specifically shown on the drawings or instructed by the Engineer, all lanterns should be of the semi-cut off or fully cut off type Permitted spill light levels shall be controlled on both the front and rear of the lighting unit as follows: At the right of way limit on the opposite side of the road – maximum Lx, and at the right of way limit to the rear of the lighting unit – zero The Contractor shall submit factory test data to demonstrate conformance with these spill light levels LIGHTING CONTROL PANELS The lighting control panels shall be included as feeders of the power source fed to the circuits of the street lighting The panels shall be as shown on the Drawings or equivalent subject to approval by the Engineer The panels shall be substantial, free-standing structures on a concrete foundation a minimum of 40 cm above ground level Panel roofs shall be in conformance with the Drawings or equivalent subject to approval by the Engineer The panel and door shall be made from stainless steel sheet not less than 2.3 millimetres in thickness with the necessary steel frames The welding for all outside joints shall be smooth finished The panel shall have a bottom design that will permit tack welding to channels that shall be set on the raised concrete foundation The panel shall be fully assembled and wired at the factory Main and small wiring shall be easily accessible for maintenance and inspection Small wiring shall be effectively isolated from the main wiring Each panel shall have one or more nameplates for identification Nameplates shall be made of laminated plastic with white characters to show through a black top layer when cut or engraved Panel housings shall be fitted with a substantial lock with a master key if appropriate LIGHTING POLES All poles supplied shall be of the anchor base type, and shall have a cast steel anchor base fitted over the shaft The service door and cover plate for the terminal connection shall be 1.0 meter above ground level Identification plates shall be attached to each lighting pole 10/ 17 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 XI CONSTRUCTION REQUIREMENTS All workmanship shall be complete and in accordance with the latest accepted standards of the industry, as determined by the Engineer Installation of ducts, construction of manholes, and excavation for cable or ducts shall be in accordance with requirements indicated on the Drawings CABLE Cable shall conform to the requirements of appropriate codes Cable within cabinets, manholes, etc shall be neatly arranged and within cabinets shall be laced Powdered soapstone, talc, or lubricant shall not be used in placing conductors in conduit Splicing in conductors will be permitted only at manholes, transformer leads, in pole bases, or at control equipment POWER SERVICE POINTS Power service points are located within or close to the Site, normally, but not necessarily always, at the sub-station transformer house nearest the project main lighting panel designated on the drawings Unless otherwise noted on the Drawings, each service point shall include a power consumption meter (wattmeter) installed in accordance with serving utility requirements, a three wire service breaker of size noted on the Drawings, the necessary conduit risers and grounding assembly In general, all multiple lighting will be 240 volts, 50 Hz or as noted on the Drawings The Contractor shall prepare all drawings required and all necessary documentation for the application for the service connection which shall be submitted to the Engineer The Engineer shall then upon request of the Contractor make arrangements with the serving utility to complete the service connections The serving utility connection costs, the electrical energy consumption shall be borne by the Contractor FIELD TEST The Contractor shall conduct the following tests on the lighting circuits in the presence of the Engineer prior to completion of the work  Test for continuity of each circuit  Test for grounding in each circuit  A megger test on each circuit between the conductor and ground with all switchboards, panel boards, fuse holders, switches, and socket outlets and over current devices in place and all readings recorded The Contractor shall furnish the Engineer with three copies of the test results identifying observed readings with their respective circuits The insulation resistance between conductor and ground shall be not less than 10 mega-ohms  A functional test in which it is demonstrated that each and every part of the system functions as specified or intended herein 11/ 17 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450  If any fault in any material or in any part of the installation is revealed by these tests the faulty work shall be repaired or replaced by the Contractor in a manner approved by the Engineer, and the same test shall be repeated until no fault appears PAINTING All painting required should be in conformance with applicable portions of Specification “Painting” If the enclosure of any electrical equipment (less signal heads) located above ground does not have an exterior surface of either aluminium or galvanizing, then it shall be finished with two coats of an approved zinc based paint, plus such finishing coat as may be approved by the Engineer Galvanized steel or aluminium lighting poles and lighting lanterns shall not be painted without prior approval by the Engineer LIGHTING POLES Lighting poles shall at all times be handled and erected in such a manner that they will not be damaged Any damage due to the Contractor's operations shall be repaired or replaced to the satisfaction of the Engineer at the Contractor's expense Lighting poles shall not be erected on concrete foundations until foundations have set at least 72 hours LIGHTING CONTROL PANEL Where specifically detailed on the Drawings for service locations where two or more lighting circuits are operated from one time switch control device, the relays, service breakers and any other necessary control equipment shall be grouped together and installed in a suitable rain-tight enclosure of a sufficient size to accommodate all of the equipment installed therein Each electrical control ballast assembly shall be protected by moulded circuit breakers XII CONSTRUCTION ANCHOR BOLTS IN CONCRETE STRUCTURES Details of anchor bolts shall be in accordance with the Drawings Anchor bolts shall be fixed in the concrete structure positions and held in place by means of templates until the concrete has set FOUNDATIONS FOR LIGHTING POLES Concrete for foundations for lighting poles and pedestals of cabinets shall be of the class shown on the Drawings All details of concrete and reinforcement for foundations shall conform to the requirements of the appropriate specification The anchor bolts shall be hot dip galvanized The top of the anchor bolts shall be protected by hexagon cap nuts or equivalent means FOUNDATIONS AND MANHOLES Concrete for foundations shall be the Class indicated on the drawings and shall be provided in accordance with the appropriate Specifications 12/ 17 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 The bottom of concrete foundations shall rest on firm ground Foundations shall be poured in one pour where practicable The exposed portions shall be formed to present a neat appearance Forms shall be true to line and grade Tops of footings for poles, except special foundations, shall be finished to ground line or sidewalk grade, unless otherwise noted on the Drawings or directed by the Engineer Forms shall be rigid and securely braced in place Conduit ends and anchor bolts shall be placed in their proper position and height and shall be held firmly in place until concrete sets Plumbing or raking of poles shall be accomplished by the adjustment of levelling nuts and bolts Shims or other similar devices shall not be used Formwork and ground in contact with the concrete shall be thoroughly moistened before placing concrete Forms shall not be removed until the concrete has set for at least days A "rubbed surface finish" shall be applied to exposed surfaces of concrete in accordance with the requirements of requirements of “Concrete and Concrete Structures” Where obstructions prevent construction of a foundation as detailed, the Contractor shall propose and construct an effective foundation to the satisfaction of the Engineer CONDUIT Installation of conduit shall be performed in accordance with these Specifications and in reasonably close conformity with the locations as noted on the Drawings or as agreed by the Engineer The size of conduit used shall be as shown on the Drawings Conduits smaller than 22mm electrical trade size shall not be used, unless otherwise specified The Contractor may at his own expense use larger size conduit Such larger size conduit shall be for the entire length of the run from outlet to outlet and no reducing couplings will be permitted The ends of all conduits shall be well reamed to remove burrs and rough edges Field cuts shall be made square and true so that the ends will butt or come together for the full circumference Slip joints or running threads will not be permitted for coupling conduit When a standard coupling cannot be used, an approved threaded union coupling shall be used The threads of all steel conduits shall be well painted with good quality lead or rust-preventative paint before couplings are made up All screwed steel couplings shall tighten until the ends of the conduits are brought together so that a good electrical connection will be made throughout the entire length of the conduit run Where coating on steel conduit has been 13/ 17 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 damaged by handling or installation, such damaged areas shall be painted with rust-preventative paint All conduit ends shall be threaded and capped with standard conduit couplings capped with conduit push pennies until wiring is started Conduit stubs from bases shall extend at least 15 cm from the face of foundations and at least 70 cm below the top of foundations Conduit bends, except factory bends, shall have a radius of not less than six times the inside diameter of the conduit Where factory bends are not used, conduit shall be bent using an approved conduit bending tool employing correctly sized dies, without crimping or flattening, using the longest radius practicable Conduit terminating in poles or pedestals shall extend approximately 15 cm above the foundation vertically and shall be sloped towards the hand-hole opening Conduit entering through the bottom of a junction box shall be located near the end walls to leave the major portion of the box clear At all outlets, conduit shall enter from the direction of the run, terminate 15 to 20 cm below the pull box lid and within cm of the box wall nearest its entry location Suitable markers shall be set at the ends of conduits that are covered so that they may be easily located A pull wire shall be installed in all conduits that are to receive future conductors At least 60 cm of pull wire shall be doubled back into the conduit at each termination HIGH DENSITY STRUCTURE POLYETHYLENE PIPE (HDPE) IN CONCRETE The installation of the required pipe shall be performed in accordance with the Specifications and in reasonably close conformity with the locations as specified in the Drawings or as directed by the Engineer The size of HDPE pipe used shall be as shown in the Drawings Pipe smaller than 50 mm diameter electrical trade size shall not be used, unless otherwise specified It shall be the option of the Contractor, at his own expense, to use larger size conduit if desired, and where larger size conduit is used, it shall be for the entire length of the run from pull box to pull box No reducing coupling will be permitted JUNCTION (PULL) BOXES Junction (Pull) boxes shall be installed at the locations shown on the Drawings, and at such additional points as approved by the Engineer The Contractor may install, at his own expense, such additional boxes as may be desired to facilitate the work PULL BOX IN CONCRETE STRUCTURE Pull boxes shall be installed in concrete structures at the locations shown in the Drawings, and, at such additional points as ordered by the Engineer The Contractor may install, at his own expense, such additional boxes as may be desired to facilitate the works 14/ 17 ELECTRICAL MANHOLE / HANDHOLES PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 All details of manholes or handholes or both shall be in accordance with the Drawings Conduit or duct endings shall be fixed in the proper position and held in place by means of templates until the concrete has set An ordinary surface finish shall be applied to exposed concrete surface in accordance with section 07100 “Concrete and Concrete Structures” of these Specifications Excavation for cable installation shall be of the width necessary for satisfactory laying of the cable and shall ensure that cables are at least 600 mm below finished level The bottom of the cable trench shall be level and free from stones or other sharp objects The depth of the cable may be increased if this is necessary to avoid existing obstructions UNDER GROUND DUCT The location of duct will be as shown in Drawings or as instructed by the Engineer Unless the Contractor elects at his own expense to install duct by jacking or drilling, all work on ducts shall be completed before work is started on the subbase course Full details of any ducts to be installed by jacking or drilling must be submitted to the Engineer for his approval Unless otherwise instructed, all ducts shall extend at least 600 mm beyond the edge of the pavement Suitable marker stakes shall be set at the ends of ducts which are buried so that they may be easily located Existing underground ducts to be incorporated into a new system shall be blown out with compressed air and checked with a mandrel A galvanized pull wire shall be installed in all ducts which are to receive future cables At least 600 mm of pull wire shall be doubled back into the duct at each termination All ducts shall be laid in straight lines only, with a minimum number of joints throughout the lengths of each duct run Where joints must be provided the ends of all ducts shall be well reamed to remove burrs and rough edge Where metallic conduits have been specified field cuts shall be made square and true so that the ends will butt or come together for the full circumference thereof Slip joints or running threads will not be permitted for coupling metallic ducts When a standard coupling cannot be used an approved threaded union coupling shall be used The threads on all ducts shall be well painted with a good quality of lead or rust preventive paint before couplings are made up All ducts shall be checked with a mandrel after completion of each installation 15/ 17 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 Unless otherwise approved by the Engineer ducts shall be laid to a depth of not less than 700 mm below ground level and all other areas and to a depth of not less than 1000 mm below the finished grade in road-crossing areas 10 DUCT BANK Underground duct bank shall be constructed of pipe(s) encased in concrete Except where rigid galvanized steel conduit is indicated or specified, the pipe shall be of HDPE pipe The kind of conduit used shall not be mixed in anyone duct bank Ducts shall not be smaller than 65mm inner diameter unless otherwise indicated The top of the concrete envelope shall not be less than 450 mm below grade except that under roads and pavement, it shall be not less than 600 mm below grade Duct lines shall have a continuous slope downward toward underground structures and away from building with a pitch of not less than 76 mm in 30 meters Except at conduit risers, changes in direction of runs exceeding a total of 10 degrees, either vertical or horizontal, shall be accomplished by a long sweep bends having a minimum radius of curvature of 7.6 meters, sweep brands may be made up of one or more curved or straight sections or combinations thereof Trenches shall be excavated along straight lines from structure to structure before ducts are laid or structure constructed so the elevation can be adjusted, if necessary, to avoid unseen obstruction 11 TERMINATION OF DUCT Pipes shall terminate in end-bells where duct lines enter underground structures The joints of the pipes shall be staggered by rows and layers so as to provide a duct line having the maximum strength During construction, partially completed duct lines shall be protected from the entrance of debris such as mud, sand dirt by means of suitable conduits plugs As each section of duct line is completed from structure to structure, a testing mandrel not less than 300 mm long with a diameter of mm less than the size of the conduit, shall be drawn through each conduits, after which a brush having the diameter of the duct, and having stiff bristles shall be drawn through until the conduit is clear of all particles of earth, sand and gravel, conduit plugs shall then be immediately installed Provide a plastic pull rope, having meter or spare at each end of the ducts For duct line connections to concrete pads, break an opening on the pad out to the dimensions required and preserve the steel in the pad During construction, wherever a construction joints is necessary in a duct line, debris such as mud, sand and dirt shall be prevented from entering into the ducts by providing suitable pipes plugs etc 12 UNDERGROUND PIPE FOR BRANCH CIRCUITS Underground pipes for branch circuits shall be HDPE pipe from the panel board and lighting pole and projections thereof, the ends of the pipes shall be protected by caps Pipes shall be cleaned and plugged until conductors are installed 16/ 17 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 The underground portion of the pipe shall be encased in a concrete envelope and shall be buried as specified for underground ducting with concrete encasement 13 EXCAVATION AND BACK-FILLING The excavation and back-filling required for the foundations of poles and other appliances should be performed in accordance with the requirements of the appropriate Specifications and the cost is deemed to be included in the unit rate All excavation for hand holes, ducts, and cable installation shall be carried out so as to minimize damage to existing surfaces The Contractor will reinstate all surfaces on completion of back-filling to the original condition and in accordance with the Engineer's instruction To facilities reinstatement the outline of all areas to be removed in Portland cement concrete and asphalt concrete sidewalks and pavements shall be cut to a minimum depth of 50 mm with a saw, prior to removing the sidewalk and pavement materials Cut for remainder of the required depth may be made by a method satisfactory to the Engineer Cuts shall be neat and true and surfaces outside the removal area shall not be damaged The Engineer may waive or modify the above requirements for excavation and reinstatement when the excavation lies within an area to be overlaid or reconstructed under other clause of the Specifications All backfill for manholes, duct banks, and ducts shall comply with the requirements of the relevant sections of the Specifications 17/ 17 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE ... accordance with the Power Supply Company’s Standards and Vietnam Standards: a) Distribution Panel b) Lightning Arrestors c) Fuses Cut-out d) Transformers e) Low Voltage Power Cable from Transformer... certificate and GROUNDING Metal conduit, steel poles and cabinets shall be made mechanically and electrically secured to form a continuous system and shall be effectively grounded Bonding and grounding... STANDARDS The work covered by this specification shall be carried out in accordance with the regulations issued by the local Electricity Authority and with the following applicable standards and