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The larger the cable, the smaller the losses – hence the lower the ongoing costs. The total lifetime cost is the sum of the costs, all of which are related to cable size. The objective of economic cable sizing is to find the lowest overall total cost while maintaining safety standards.
Note that the armoring of the supply cable is commonly used as the PE conductor between the transformer and installation rather than a dedicated conductor within the supply cable. TN−C A single combined PEN conductor (PE+N) fulfils the functions of both a PE and an N conductor.
In electrical power distribution, armoured cable usually means steel wire armoured cable (SWA) which is a hard-wearing power cable designed for the supply of mains electricity. It is one of a number of armoured electrical cables – which include 11 kV Cable and 33 kV Cable – and is found in underground systems, power networks and cable ducting.
IEC 60364 Electrical Installations for Buildings is the International Electrotechnical Commission (IEC)'s international standard on electrical installations of buildings.This standard is an attempt to harmonize national wiring standards in an IEC standard and is published in the European Union by CENELEC as "HD 60364".
The selection of conductors must be made taking into consideration both the maximum voltage drop allowed at the load end and also the current carrying capacity of the conductor. Conductor size and voltage drop tables are available to determine the selection, which will be based on the load current supplied and factors such as building insulation.
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The cable management needs at either end are different (see also: Structured cabling). Buildings and office furniture are often designed with cable management in mind; for instance, desks sometimes have holes to pass cables, and dropped ceilings, raised floors and in-floor cellular raceway systems provide easy access.
Aluminum conductor steel-reinforced cable (ACSR) is a type of high-capacity, high-strength stranded conductor typically used in overhead power lines. The outer strands are high-purity aluminium , chosen for its good conductivity, low weight, low cost, resistance to corrosion and decent mechanical stress resistance.