Category Archive for: «Cables»

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Characteristics of XLPE insulated cables with reference to the UK standards

Cross-linking effect XLPE is the recognized abbreviation for cross-linked polyethylene. This and other cross-linked synthetic materials, of which EPR (ethylene propylene rubber) is a notable example, are being increasingly used as cable insulants for a wide range of voltages. Polyethylene has good electrical properties and in particular a low dielectric loss factor, which gives it […]

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4 ways in which noise can enter a signal cable and its control – Part 2

Continued from part 1… Read here. Electromagnetic induction and RFI In previous part of this technical article, I wrote about electrical noise occurs or is transmitted into a signal cable system in the following four ways: Galvanic (direct electrical contact) – part 1 Electrostatic coupling – part 1 Electromagnetic induction Radio frequency interference (RFI) 3. […]

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4 ways in which noise can enter a signal cable and its control – Part 1

Few words about interference… Noise, or interference, can be defined as undesirable electrical signals, which distort or interfere with an original (or desired) signal. Noise could be transient (temporary) or constant. Unpredictable transient noise is caused, for example, by lightning. Electrical noise occurs or is transmitted into a signal cable system in the following four […]

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What engineers should know about using conduits in power substation designs

Design challenges There are several locations where conduit is used in power substation designs. The most common one considered is conduit used to provide cable access to equipment, such as breakers, transformers, instrument transformers, and motor-operated disconnect switches located in the yard of the substation. Conduit can be a means by which direct buried cable […]

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Cable spacing as a means of noise mitigation

Separation distances In situations where there are a large number of cables varying in voltage and current levels, the IEEE 518-1982 standard has developed a useful set of tables indicating separation distances for the various classes of cables. There are four classification levels of susceptibility for cables. Susceptibility, in this context, is understood to be […]

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An example how to calculate voltage drop and size of electrical cable

Input information Electrical details: Electrical load of 80KW, distance between source and load is 200 meters, system voltage 415V three phase, power factor is 0.8, permissible voltage drop is  5%, demand factor is 1. Cable laying detail: Cable is directed buried in ground in trench at the depth of 1 meter. Ground temperature is approximate […]

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Underfloor Cable Systems

Power distribution It should be understood that the generic term ‘underfloor’ applies to products designed for such use but which may well be used in other environments where the protection is appropriate. There are two main types of such systems: Those designed for incorporation into the floor structure itself, such as trunking systems for casting […]

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Practices for grounding and bonding of cable trays

Metallic Cable Trays Cable tray may be used as the Equipment Grounding Conductor (EGC) in any installation where qualified persons will service the installed cable tray system. There is no restriction as to where the cable tray system is installed. The metal in cable trays may be used as the EGC as per the limitations […]

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Selection Of Number Of Cable Cores With Emphasis On Sizing Parameters

Dependance On Installation Site The selection of number of cable cores basically depends on the type of system where it is going to be installed. Generally we have two types of systems: A perfectly balanced system and A system with some degree of unbalance (or Unbalanced System). Generally cable sizing includes below parameters: Cable installation […]

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Differences Between Earthed and Unearthed Cables

Introduction In HT electrical distribution, the system can be earthed or unearthed. The selection of unearthed or earthed cable depends on distribution system. If such system is earthed, then we have to use cable which is manufactured for earthed system. (which the specifies the manufacturer). If the system is unearthed then we need to use cable […]

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