Category Archive for: «Low Voltage»

The basics of selectivity (discrimination) between circuit breakers

What is the selectivity? On economical grounds and for the reason of reliability of the service, it is not always ideal to interrupt the supply to the installation in the case of a fault as fast as possible. That’s why we have the selectivity between protective devices. So what is the selectivity? The whole point […]

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18 Initial Checks Of Electrical Installations Every Electrician MUST Perform

Testing of electrical installations // Before any testing of low voltage electrical installations (and equipment) is carried out, a detailed physical inspection must be made to ensure that everything is: To a relevant National or Harmonized European Standard Erected/installed in compliance with the IEE Regulations Not damaged in such a way that it could cause […]

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Things you MUST verify when designing low voltage switchgear

Low voltage switchgear Low voltage switchgear and distribution boards form the link between the equipment for the generation (generators), transmission (cables, overhead lines) and transformation (transformers) of electrical energy on the one hand and the consumers, e.g. motors, solenoid valves, devices for heating, lighting, air conditioning, and the information technology on the other hand. For […]

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The Basics Of Molded Case Circuit Breakers You MUST Know

Molded Case Circuit Breakers (MCCB) // Molded case circuit breakers are interrupting devices with self-contained, current-responsive elements. These breakers are assembled as an integral unit in a supported and enclosed housing of insulating material. Depending on the amount of protection required, these breakers can sense internally and then clear undervoltage, overcurrent, and short circuit conditions. […]

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3 Common Misconceptions Regarding Automatic Transfer Systems

Automatic transfer systems Several common misconceptions regarding automatic transfer systems exist. Three of these are addressed here // I need a complex automatic transfer scheme at every voltage level AC Control Power for my automatic transfer PLC can be handled by the system UPS’s Since my automatic transfer system was tested in the factory, it doesn’t […]

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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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