Category Archive for: «Cables»

Recommended Practice For Cableways Selection and Installation

Cableways // The term cableways refers to conductors and/or cables together with the means of support and protection, etc. for example: cable trays, ladders, ducts, trenches, and so on… are all cableways. This technical article covers the following topics // Selection of materials and shapes Design recommendations Metal and non-metal cableways are available Implementation of […]

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Underground residential distribution – More hidden and more reliable

Underground residential distribution / URD A classic underground residential distribution circuit is an underground circuit in a loop arrangement fed at each end from an overhead circuit (see Figure 1). The loop arrangement allows utilities to restore customers more quickly. After crews find the faulted section, they can reconfigure the loop and isolate any failed […]

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8 tips to avoid ground loops when dealing with signal level circuits

Ground loops and signal noise General recommendation is to properly design and implement the facility’s grounding system to avoid unwanted involvement of ground loops with the operation of the equipment. This kind of approach can also eliminate the need to consider equipment modifications and to engage in costly diagnostic efforts since most trouble involving common-mode […]

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Electrical Design Project Of a Small Bakery

Electrical System of Bakery A small bakery with just a counter and storage areas is simple to design. The electrical design follows the layout for a house, but care must be taken on loading factors if direct-acting electric heaters are switched on all day. These days, many shops and stores have specialised equipment for cooking food or providing other […]

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Few Aspects of Copper versus Aluminium

Conductor connections and terminations The constructions of aluminum wire and terminals have both been revised from past years. At one time the conductor was nearly pure aluminum, now they are all much stronger 8000 series alloys, with physical characteristics similar to copper. The wire terminations also have much more severe UL test requirements, resulting in […]

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General Guidelines for Online Partial Discharge Testing of Power Cables

Faults in the cable insulation Online PD testing is becoming the topic of interest for power cable owners to ensure the safe and continuous operation of power cables. If PD source is detected timely in the cable system, it could save the huge cost of unplanned outage to Plant owners. Regular periodic or continuous monitoring […]

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4 Practical Approaches To Minimize Voltage Drop Problems

What NEC states for max. voltage drop? The NEC states in an Informational Note that a maximum voltage drop of 3% for branch circuit conductors, and 5% for feeder and branch circuit conductors together, will provide reasonable efficiency of operation for general use circuits. For sensitive electronic loads, circuits should be designed for a maximum […]

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Test On 110kV Power Cable After Installation (3)

General description of site test procedure In previous two parts of this technical article first six procedures were explained. Now the last three (7, 8 and 9) will be explained in details: Phase indication test (part 1) DC conductor resistance measurement (part 1) Capacitance test (par 1) DC Sheath test on outher sheath (part 2) Insulation resistance […]

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Test On 110kV Power Cable After Installation (2)

General description of site test procedure In previous part of this technical article first three procedures were explained. Now the rest will be explained in details: Phase indication test (previous part) DC conductor resistance measurement (previous part) Capacitance test (previous part) DC Sheath test on outher sheath Insulation resistance measurement Cross bonding check Zero sequence and […]

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Test On 110kV Power Cable After Installation (1)

General description of site test procedure Site test procedure covers all necessary electrical testing for the 110 kV cable and accessories to be carried out during and after installation of the cable system. 110 kV, 115 kV and 132 kV XLPE Cables (Standard Reference is IEC 60840 and relevant SEC Transmission Specifications 11-TMSS-02, Rev. 0 […]

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