Buried cable installation practices prysmian group. Underground cable laying proposal to lay power cable and ofc in. High voltage xlpe cable systems technical user guide. Undergrounding high voltage electricity transmission. This program describes two methods of installing underground cable. Rus bulletin 1728f806 page 7 5 special requirements for coordination between owner and.
This is known as direct burial, and if you do this, the uf cable must be at least 24 inches below the surface of the ground, to minimize the chance of the cable being pierced by routine shoveling. It applies for the laying of cables and cable ducts and for the manufacture and maintenance of ducts, including the associated shafts, masts, distribution cubicles and the like. The cable must be provided with suitable mechanical protection to withstand the rough use in laying it. Laying electrical cable underground is a project that a lot of people undertake at some point in their lives. The design of the drainage schemes will be agreed in detail with the landowners and occupiers and will normally include a combination of the permanent cross connection of existing drains coupled with the installation of new drains laid in parallel to the underground cables. Underground cable laying accessories technische anderungen vorbehalten. Search or browse our list of underground wire and cable laying contrs companies by category or location.
Engineering data for copper and aluminum conductor. Since the mechanical strain on the cable in its laid form is significantly less, the permissible temperature range is greater than the range valid for the installation period. Uegnsg211a lay underground electrical supply cables date this document was generated. Index termspower cable, ofc cable, underground cable laying. It also applies for the braking open of solid surfaces for underground cable laying work. Only the reference to the voba has been updated in clause 0. Technical specification for underground power cables and. Applicability these guidelines apply to all public and private underground utilities, including, but not limited to, electric power, communications e.
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. Underground cables april 2018ver2mh the width of the working strip is dependent upon the the voltage of the underground cable, the number of cables and how many trenches are required. Jul 01, 20 laying of underground cables the reliability of underground cable network depends to a considerable extent upon proper laying. Undergrounding high voltage electricity transmission lines. The nets consists of approximately 7,200 kilometres 4,474 miles of overhead line, 1,500 kilometres 932 miles of underground cable and 342 substations. The civil works during this time can have considerable consequences for the environment. The type of installation proposed based on the site conditions and terrain in the project area is underground installation in trenches. There are a lot of things that you have to take into consideration when doing this project. These components are described in more detail in this document. Technical specification for underground power cables and accessories for nominal system voltages of 66kv and 2 kv i specificationjts040110 ver 1 joint document between energex and ergon energy. There are three main methods of laying underground cables, which are i direct laying, ii drawin system and iii. Technical specification for design, supply, installation.
The installation company responsible for laying the cables must heed the following parameters. The vde 0816 gives the following values, during laying. Ug cable underground cable weights and measures sq. However, the character and extend of ramifications differ extremely. This course also demonstrates how to use various types of equipment and tools for rigging manholes and for pulling cable in conduit. See here for the magnetic fields produced by underground cables and specifically the fields produced by these three different types. The discussion is focused on transmission cables but also has relevance for distribution cable applications. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to. The total number of underground cable circuits, their size, the method of laying, crossing with other utilities such as roads, telecommunication, gas, or water network are of crucial importance when determining design of the cable systems. Specifications are subject to change without notice. Guidelines for underground utility installations crossing.
Underground cable distribution up to and including 33kv. Different types of underground cable the highvoltage underground cables used on the national grid system can be one of three types. Uegnsg211a lay underground electrical supply cables. Laying of underground cables the reliability of underground cable network depends to a considerable extent upon proper laying. Technical specification for underground power cables and accessories for nominal system voltages of 66kv and 2 kv page 1 of 24 specificationjts040110 ver 1. Direct in the ground in trenches underground cables. Under ground cables presention linkedin slideshare. This procedure provides detailed for underground pipe installation in soil conditions as prevalent in the project area. Underground power cables high voltage underground cables 2 2 circuits 3000m 3x1x2000mm2 e. Underground power cables high voltage underground cables 2 2 circuits 3000m. General technical specifications in construction contracts atv underground cable laying work.
The mineral materials such as sand or stone used in making concrete. These lines are mainly used in the transmission lines between two units of an electricity distribution grid, a generator unit and a distribution. To prevent electric field concentration, there is an interface of. Environmental aspects of underground cabling grid configuration. Materials such as sand, crushed stone, or soil, which are used to refill a trench after conduits or cables have been laid therein. Engineering and installations should jointly presurvey the job site and cable route to ensure all problem areas are uncovered before pulling. Engineering data for copper and aluminum conductor electrical cables 102 hilltop road, ramsey, nj 07446 201. A device usually secured to the wall of an underground cable vault ucv. If the meter box is external then the cable is to follow route 1 if the meter box is internal then the cable is to follow route 2 n. Further, the vertical runs where the cable descends into the ground at the house side and emerges up from the ground at the outbuilding. It does not legally have to be done by an electrician despite what some people may believe.
Cables to be laid outdoors are usually delivered on large wooden or steel drums. All dielectric self supporting adss fiber optic cable. Sep 18, 2011 direct laying draw in system solid system direct laying. Method statement for installation of high voltage hv. Both options are never without environmental impacts. Underground cables, because of the insulation and surrounding environment, tend to retain the heat produced in the copperaluminium conductor. Given a new cable installation task, both the departments have their separate speci. In addition, underground cable circuits must be sized adequately to carry the. Network and assets we own the national electricity transmission system in england and wales nets. This method of laying underground cables is simple and cheap and is much favoured in modern practice. High voltage xlpe cable systems techincal user guide.
Trenches need to be excavated and access to the construction site has to be cleared for heavy machinery needed for cable transportation and trenching. The decision between underground cables and overhead lines comes up at some point during the planning of every new power line. Underground cables are, of course, meant to be installed or laid under the ground. In this method, a trench of about 15 metres deep and 45 cm wide is dug. Introduction increasingly, utilities, developers and power producers seeking to build new power transmission. There are three main methods of laying underground cables a.
Ucvs underground cable vaults definitions aggregate. In the following paper, we would like to suggest some of these areas for your consideration in. Installation of an underground transmission cable generally involves the following sequence of events. The cable route drawings issued with the inquiry documents are for tender. Direct laying of underground cables this method is the most popular as it is simple and cheap. Practical power cable ampacity analysis ced engineering.
Din 18322 german construction contract procedures vob part c. Magdi elsaadawi requirements of underground cables. The program demonstrates how to lay cable in an open trench and pull cable in conduit. Laying uf underground feeder cable directly into the ground.
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. Insulation resistance of hv cable should be checked by using 5 kv megger after installation and before termination of cables and readings shall be. Pdf the objective of this paper is to workout and highlight the possibilities to operate an ac power cable and optical fibre cable ofc by laying. Guidelines for underground utility installations crossing highway rightsofway march 20 3 2. Pdf underground cable laying proposal to lay power cable and. Underground electric transmission lines wisconsin psc. The insulation method depends upon the type of cable used see section on underground cable technologies. Direct laying draw in system solid system direct laying. Pdf underground cable laying proposal to lay power.
Uegnsg211a lay underground electrical supply cables modification history not applicable unit descriptor. The reliability of underground cable network highly depends upon proper laying of cables, quality of cable joints and branch connections etc. It may be increased at certain points, for example road, rail, river and canal crossings, to accommodate the more complex construction processes at these locations. Underground power cables and accessories for nominal system voltages of 66kv and 2 kv jts040110. At that time, the contractor shall propose any desirable changes or clarifications.
Underground cable installation manual western power. Underground cable laying proposal to lay power cable and ofc in one trench conference paper pdf available december 2014 with 3,490 reads how we measure reads. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. There are five different methods of laying cables e. Manual laying is not possible due to the excessive weight. Underground electrical cable installation training course. The trench is covered with a layer of fine sand of about 10. The design of the drainage schemes will be agreed in detail with the landowners and occupiers and will normally include a combination of the permanent cross connection of existing drains coupled with the installation of new drains laid in parallel to the underground cable s.