Optical submarine cable laying method laying procedure. Cables on faceup horizontally fixed tray must be secured by use of the tie wraps where not in. Cables are laid at a typical ship speed of 6 knots. A method for laying cable from a vessel at a near shore location in shallow water to shore. Look out for heating tubes, which are not heated all the time. All cable shall be securely fixed to the tray, work and the complete installation must be carried out in a neat and workmanlike manner without crossovers. Pull the cable with cable pulling machine or manually from one feeder end to the other end. These three methods are explained below with their advantages and. Bentley raceway and cable management has a default method defined multilayer, but this section lets you define fill. Most utilities are currently using one or more of these methods with various degrees of success.
All installed cables to be sealed at both ends by proper end caps shrouded to avoid dirt, debris and water accumulation. Electrical installations of ships and of mobile and fixed offshore units. Underground cable distribution up to and including 33kv infrastructure technical standards page b05. Us20160254653a1 bundle of cables, a method of laying cables. Cable passing through fire rated walls will be sealed with fire barriers of approved type. A bundle of cables includes at least two underwater cables and a fastener for fastening the underwater cables together. There are three main methods of laying underground cables, which are i direct laying, ii drawin system and iii solid system. The arrangement of cables, all methods of laying and installation shall be agreed with the engineer, which shall be planned to provide an orderly formation, free from unnecessary bends and crossings, permitting the removal of any one cable without undue disturbance to adjacent cables. The name of this new group is laying and installation techniques for high voltage cable systems. It is advisable to have conduits of nonferrous metals. Buried cable installation practices prysmian group. Wiring will only be carried out after the conduit installations and plaster work is completed.
The cable should never be loaded beyond its maximum tensile strength. The roller quadrant is moved from the vessel into the water. Appendix 3 typical methods of installation of cables. Coexisting underground utilities if the cable route comes across or is between coexisting underground utilities like sewer line, open drain, canal, bridge and other utility cable trench, the cable. Jan 16, 2015 with the introduction of new internet and communications technologies, the need for laying highend, highcapacity internet and other cables such as fiber fibre optic has stepped up in india.
Weed matts are typically avoided during transits if seen during daylight hours. During rare cable laying events, vessels must follow a precise. The fastener is watersoluble, biologically decomposable andor chemically decomposable. Direct in the ground in trenches underground cables. Cable laying techniques cable insulator electricity. Do n cable than sp allow it to kin can alter the t cable the ca 3. Exact minimum bending radii for specific cables can be found in the information sheets of the cable manufacturer. The first system or method commonly undertaken is the direct. Method statement for laying of low voltage cables and wires.
Nonmetallicsheathed cable is a common wiring method used for residential and commercial branch circuits. Ieee std 525 2007 revision of ieee std 5251992incorporates ieee std 5252007cor1. Overview of the offshore transmission cable installation process in the uk 7 investment decision fid. The timeline will vary from project to project, depending on the specific engineering and financial challenges involved. Method statement risk assessment scottish government.
Identify the designated cable drum for cable pulling and raise the cable drum above the ground level with cable jack to unwind the cables to the pulling direction. During final bending the cable can, therefore, be bent more tightly. Cables or cable supports shall not be fixed directly or indirectly to plant, equipment or process piping which may require removal or replacement. Overview of the offshore transmission cable installation. Works shall be carried out in compliance with the drawings, project specifications, and materials. A method of laying at least two underwater cables simultaneously from a vessel and a method of using a watersoluble, biologically decomposable andor chemically decomposable fastener to fasten at least two underwater cables together to form a bundle of cables are also described. Ieee guide for the design and installation of cable systems. Bentley raceway and cable management has a default method defined multilayer, but this section lets you define fill methods for. The reliability of underground cable network highly depends upon proper laying of cables, quality of cable joints and branch connections etc. Cable laying techniques free download as powerpoint presentation.
Temperature range the temperature range of the cable is of great importance for both the user and fitter. Mar 09, 2018 method statement for laying of low voltage cables and wires. High voltage xlpe cable systems technical user guide. Optical fiber cables are designed with a maximum tensile strength. In cable trays or cable ducts fixed with clamps usually at walls and ceilings. There are five different methods of laying cables e. If the route contains sections where the optical cable is subject to high temperatures the necessary protection should be provided. The purpose of this method is to describe the measures and ways of proper installation of low voltage cables and wires in this project. It can also induce eddy currents in the cable sheath and metallic conduits which can cause heating. The trench is covered with a layer of fine sand of about 10 cm thickness and the cable is laid over this sand bed. The cable tray shall be installed with a 40mm minimum space between the structure and the tray. Protection of the environment during the works laying the 710mm pipe in craigendoran.
This manual provides installation information for power and control cables for industrial. It is worth noting that the 17th edition now references cables buried in the ground installation methods 70 to 73. No wires will be drawn through unless conduit and trunking installations have been completed and inspected and cleaned. The invention is generally related to laying cable from a vessel and more particularly to laying cable to or from shore. Trefoil formation refers to a method of arranging cables. During this phase, the balloon buoys are attached along the cable to prevent possible damages to the cable. The layout of this cable laying systems can show in the figure. Appendix 4 of bs 7671 institution of engineering and. Method statement for installation of cable tray or trunking. Once found, they can be easily added to the work sheets. A guideline for laying of cables and installation of sleeves. Tension during laying of the cable particular attention must be paid to the maximum possible tension.
They are logical ideas that have been arranged and put into a simple system. The timing of the fid also varies according to the approach and strategy of each offshore wind farm developer. Where single core pvc insulated wires are enclosed within the conduit and trunking, care will be taken that no damage will occur to the wires during. Displays when you select the cable routing cable laying methods tab from the options dialog. Towards the cable landing station a, one end of the cable is paid out by the cable ship and landed. Chapter methods and materials mike holt enterprises. The cable on the vessel is wrapped around a modified roller quadrant on the vessel. There are so many parameters to consider while the laying of. Method statement for installation of high voltage hv. The trench also cover with bricks or concrete slab then again fill with soil. F or purpose of deciding the depth at which the cable is to be laid a rocky. Figure f2 cable feed into conduit at floor level c from cable reel to cable tray, the cable is fed from the top of the reel to maintain required curvature. High voltage xlpe cable systems techincal user guide brugg cables page 2. The routing line is also used to bridge gaps between different raceway systems where cables simply jump from one raceway to another.
The three most common methods of cable placement are direct buried, cable. Cable laying method in the ground when placing a routing line using the raceway router, the in the ground cable laying method should be selected. Method statement for installation of high voltage hv cables. The methods set forth are not difficult, nor are they technical. Connecting the individual cables in the trefoil formation minimizes the. The purpose of work procedure for cable pulling generating this method statement is to define the procedure step by step to implement the correct practice for laying the cable from substation to the location of newly assigned area. The 3 main underground cable laying system use in practice. Cable laying shall be started by rotating the drum in a direction, recommended and marked side of the cable drum and cables are pulled, accordingly.
Underground installation of optic fiber cable placing. This method of laying underground cables is simple and cheap and is much favoured in modern practice. The cable laying methods grid lets you configure the methods for how cable is run in a specific raceway component type such as cable tray, conduit, duct bank etc. This technique has an advantage over conventional cable laying methods in that it is much faster to execute.
Other methods of installation are recognised but are, essentially, variations of other methods and are therefore allocated appropriate reference methods, shown in table 2 overleaf. Main changes with respect to the second edition relate to. Insulation resistance of hv cable should be checked by using 5 kv megger after installation and before termination of cables and readings shall be submitted to the consultant. Nonmetallicsheathed cable encloses two, three, or four insulated conductors, 14 awg through 2 awg, within a nonmetallic outer jacket. Normally in the electrical system, most of the high voltage cables are laid under the ground. The three most common methods of cable placement are direct buried, cable in conduit, and a total conduit system. Cable burial is not an element of cable laying in this region. Appendix 4 of bs 7671 bs 7671 home of the wiring regulations.
While the crosssection varies between 7 and 15 cm, the depth is typically between 30 and 40 cm. By following this system, the estimator will automatically find any items that may have been missed during the initial takeoff. The cable is fed from the bottom of the reel so that its curvature is continuous with no reversed bends. Laying condition type of insulation cable type and design economic aspects. May 19, 2017 cable tags will be installed on both ends of the cable. Ieee guide for the design and installation of cable systems in substations sponsor substations committee of the. The arrangement of cables, all methods of laying and installation shall be agreed with the engineer, which shall be planned to provide an orderly formation, free from unnecessary bends and crossings, permitting the removal of any one cable without undue disturbance to. Traditionally, the standard methodology for laying a subsea cable to or from shore would be by either of the following two methods.
This method of laying cables into the ground tends to be used where the cables in use are of a higher voltage mv hv cables and therefore have a greater outside cable diameter. This method is the most popular as it is simple and cheap. Mar 14, 2018 open trench cable laying is often used as opposed to laying cables directly into cable ducts. On the basis of surveys, general permission from road and rail authorities for laying the optical fiber cable along the decided routes and permission for rail road crossings will have to be obtained. Cable installation manual for power and general cable. The direct system of cable laying involves the cables laid in a cable trench and after that, the cable is filled with soil.
With the introduction of new internet and communications technologies, the need for laying highend, highcapacity internet and other. There are different methods are used to lay cable in the electrical systems. Ieee guide for the design and installation of cable. Us20160254653a1 bundle of cables, a method of laying. A method of laying at least two underwater cables simultaneously from a vessel and a method of using a watersoluble, biologically decomposable andor. The system of cable laid with a serving and its enough to protect the power. A pulling device is attached by a line to the roller quadrant. Accurate and faultless installation and assembly of cables and sleeves. Scope of this method statement covers the following activities.
The sand prevents the entry of moisture from the ground and. The cables to be laid using this method must have the serving of bituminised paper and hessian tape so as to provide protection against corrosion and electrolysis. Open trench cable laying is often used as opposed to laying cables directly into cable ducts. For groups of cable d e is the sum of the cable diameters. This third edition cancels and replaces the second edition published in 1997, of which it constitutes a technical revision. The crosssection and depth of the trench will depend on the number of ducts to be laid. Cable preparation and pulling procedure best practices for. Cables shall be laid on racks or trays strictly in accordance with the laying patterns stated on the layout drawings. Because this cable is nonmetallic, it contains a separate equipment grounding conductor. Installation of power cables under tracks and elsewhere on railway. The pulling device is used to pull the roller quadrant and cable toward shore.
1447 468 1185 1226 781 211 1315 1557 1355 1104 274 633 41 219 607 151 424 233 1528 304 1306 1510 303 1038 531 131 1262 350 1002 214 631 97 1390 437 1072 804