Category Archive for: «Cables»

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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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Underground Residential Distribution Layouts

Underground Construction Where general appearance, economics, congestion, or maintenance conditions make overhead construction inadvisable, underground construction is specified. While overhead lines have been ordinarily considered to be less expensive and easier to maintain, developments in underground cables and construction practices have narrowed the cost gap to the point where such systems are competitive in urban […]

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Inspection and Test Procedures for LV Cables

Content Visual and Mechanical Inspection Electrical Tests Test Values TABLE 100.12 – US Standard Fasteners – Bolt-Torque Values for Electrical Connections Cables, Low-Voltage, 600 Volt Maximum 1. Visual and Mechanical Inspection Compare cable data with drawings and specifications. Inspect exposed sections of cables for physical damage and correct connection in accordance with single-line diagram. Inspect bolted […]

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Short Overview of LV Cable Terminations

A termination is the electrical and physical connection of a cable end to a piece of equipment or another cable. A splice is the electrical connection of a cable end to another cable with the same cable number. Cable terminations (splices) are designed and installed to interconnect two cable ends both electrically and physically. The physical requirements relate […]

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Corrosion Types Encountered With Power Cables

Content Introduction Anodic Corrosion (Stray DC Currents) Cathodic Corrosion Galvanic Corrosion Chemical Corrosion AC Corrosion Local Cell Corrosion Other Forms of Corrosion Introduction There are numerous types of corrosion, but the ones that are discussed here are the ones that are most likely to be encountered with underground power cable facilities. In this initial explanation, […]

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The Good, The Bad and The Ugly Cable Insulation

Insulation Fundamentals The fundamental understanding of cable insulation properties forms the foundation for assessment of cable operability. These same fundamentals provide the basis for evaluating whether various electrical and physical tests and measurements are meaningful, cost-effective, and warranted, and are a basis for evaluation of present or conventional cable test practices against the critical properties […]

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Cable Engineering in Substation and Power Plant

Single core cable should be unarmored? Is it true that single core cable should be unarmored because eddy currents are induced in armor of single core cable which will cause additional losses? If true then why not three core cables also unarmored and why single core armored cables manufactured at all. In this scenario one […]

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