Category Archive for: «Energy and Power»

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19 Essential Information You Can Find On Motor Nameplate

Understanding motor’s nameplate Motor nameplate is normally located on all produced electric motors. Understanding nameplate information can be hard sometimes, but is essential. In most countries it is a requirement for manufacturers to display all information on the motor’s nameplate, but often this is not the case. However, when a motor has been in operation […]

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Electrical Design Project Of a Small Bakery (1)

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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Things About MCBs That Every Low Voltage Electrician Should Know

MCB Operation and characteristics An MCB is a thermo-magnetic device, meaning that it has two methods of circuit interruption. A thermal mechanism, usually a bi-metallic strip, provides protection against moderate overcurrent. The heating action of the current causes the bi-metallic strip to curve and break circuit contact. This method is complemented by a solenoid designed to respond to […]

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Kirchhoff’s Laws For Electrical Engineers – Beginners

Voltages and currents in electric circuits Two extremely important principles in electric circuits were codified by Gustav Robert Kirchhoff in the year 1847, known as Kirchhoff’s Laws. His two laws refer to Voltages and Currents in electric circuits, respectively. Kirchhoff’s Voltage Law Kirchhoff’s Voltage Law states that the algebraic sum of all voltages in a […]

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10 Common Causes Of Arc-Flash and Other Electrical Accidents

Carelessness on top // The most common cause of Arc Flash and other electrical accidents is carelessness. No matter how well a person may be trained, distractions, weariness, pressure to restore power, or over- confidence can cause an electrical worker to bypass safety procedures, work unprotected, drop a tool or make contact between energized conductors. […]

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What parallel redundancy does to the power distribution system?

Increasing reliability // Redundancy is a useful method of increasing reliability and optimising the balance between operation effectiveness and expenditure. In the context of reliability, redundancy signifies that a system will continue to function satisfactorily in spite of the failure of some of the component parts. This resilience to failures is obtained by providing alternative […]

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13 Basic expressions often used in electrical testing

Testing of electrical installations // This is the simple list of basic terms you can often hear when testing and measurements of electrical installation (in general) is being performed. While expirienced electrical engineers will find this list short, I hope beginners will catch the essence and continue exploring this field of electrical engineering. Feel free […]

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Two Circuit-Breaker Types For Automatic Disconnection Of the Supply

Automatic disconnection The Standard IEC 60364 prescribes automatic disconnection of the supply for protection against indirect contact. What does it mean // The protective device shall automatically disconnect the supply so that, in the event of a fault between a live part and an exposed-conductive-part or a protective conductor, a prospective touch voltage exceeding 50 […]

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Comparision of Direct-on-line (DOL) and Star-delta Motor Starting

Motor starting methods // Direct-on-line (DOL) starting Advantages Drawbacks Star-delta starting Advantages Drawbacks Comparision of DOL and Star-delta starting Direct-on-line starting (DOL) As the name suggests, direct-on-line starting means that the motor is started by connecting it directly to the supply at rated voltage. Direct-on-line starting, (DOL), is suitable for stable supplies and mechanically stiff […]

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Differences in size and weight of equipment using copper and aluminium conductors

Common misconception It is a common misconception that electrical equipment built using aluminum conductors will always be larger than the same equipment using copper conductors. While the actual conductor within the equipment will be larger with aluminum, many times the enclosure for the equipment is the same size whether copper or aluminum conductors are used. […]

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