Category Archive for: «Low Voltage»

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Why I Prefer Busbar Trunking Systems More Than Cables

Planning concept for power supply // When a planning concept for power supply is developed, it is not only imperative to observe standards and regulations, it is also important to discuss and clarify economic and technical interrelations (cables and/or busbar trunking systems depending on situations). The rating and selection of electric equipment, such as distribution […]

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10 questions to test your electrician skills

Let’s test your electrician skills // These are not-so-easy, but also not-too-hard questions for you to try to answer and test your electrician skills. Whether you are a novice in a field of electrical engineering or a professional electrician, these questions will move your brain cells for sure! To check your results, take a peek […]

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Guidelines To Inspection Of Molded Case Circuit Breakers (MCCB)

NEMA AB 4 and MCCB maintenance The need for inspection of molded case breakers (MCCB) will vary depending on operating conditions. Suggested inspection and testing is defined in ANSI/NEMA AB 4, Guidelines for Inspection and Preventive Maintenance of Molded Case Circuit Breakers Used in Commercial and Industrial Applications. As part of these guidelines, AB 4 […]

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Electrical Distribution Architecture In Water Treatment Plants

Water treatment plants For both drinking water and wastewater treatment, 4 different sizes of plants have been distinguished. The size of plants can be expressed in quantity of treated water per day, or in corresponding number of inhabitants. Four different types of (waste) water treatment plants have been distinguished, depending on destination and size: T1 – […]

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The Basics Of Circuit Breaker Tripping Units

Circuit breaker releases / Tripping units The main objective of circuit breaker tripping units and protective functions in general is to detect faults and to selectively isolate faulted parts of the system. It must also permit short clearance times to limit the fault power and the effect of arcing faults. The protective function of the […]

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Learn To Interpret Single Line Diagram (SLD)

Single line diagram (SLD) We usually depict the electrical distribution system by a graphic representation called a single line diagram (SLD). A single line can show all or part of a system. It is very versatile and comprehensive because it can depict very simple DC circuits, or a very complicated three-phase system. We use universally […]

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7 Guidelines To Select Correctly Rated Circuit Breaker

Selection of rated circuit breaker // The general procedure for the selection of correctly rated circuit breaker follows the following scheme of seven major questions you should answer: What is the task of the branch circuit or feeder? Which rated current / setting range? Breaking/making capacities / rated operational voltage? Any special requirements? Which type […]

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Example On How To Design a Low Voltage Switchboard

Low voltage switchboard construction This technical article has the aim of helping the panel builder and the designer in the construction of ABB SACE ArTu low voltage switchboard. To this purpose, starting from the single-line diagram of a plant, it is possible to arrive – by selecting the suitable components – to the construction of […]

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Power plants on board of big ships – Primary distribution schemes

Continued from the first part Power plants on board of big ships – LV/MV ditribution MV primary distribution network The MV primary distribution network generally consists in a three-phase system with three conductors without neutral. Such system is usually managed with the neutral of the star point isolated from earth or connected with earth through […]

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Power plants on board of big ships – LV/MV ditribution

Electrical system on board // Without going into the details of the management modalities of the electric distribution or of the layout that an electrical system on board may have, it is possible to describe it in short, however giving the possibility to understand its structure and complexity. In the power plants on board of […]

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