How to Improve Office Lighting in Your Company Premises

How to Improve Office Lighting in Your Company Premises Many people don’t realize the effect that light has on us, but the truth is that humans are enormously photo sensitive. It is light and dark that determines our Circadian rhythms, and sets our body clock. That explains why office lighting quality is proven to affect…

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Basic Electrical interview Questions & Answers

1.What  is  electricity ? Ans : Electricity is a general term used for all phenomena caused by electric charge whether static or in motion. 2.What are the types of electricity ? Ans : There are two types,(1) static Electricity and (2) Current Electricity. 3.What is static electricity ? Ans : Static electricity means electricity at…

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What is GFCI and what is the use in electrical field?

Ground Fault Circuit Interrupter (GFCI) At home or outside, there is no way can we do without electricity and electrical devices. These are the indispensable necessities of our modern day lives. But sometimes their accidental “touch” can give a painful shock resulting in serious injuries which at times, sadly enough can have fatal consequences. Incidents…

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How to do Basic Wiring for Home

How To Wire A Room In Home: This a simple and basic guide and in this room electrical wiring diagram i shown a electric board which consist  two electrical outlets, 3 switches and one dimmer switch. The distribution supply comes to board and from the board it’s connected to the bulb sockets and ceiling fan….

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Types of MCB?

Types of Miniature Circuit Breakers (MCB’s) MCBs are classified into three major types according to their instantaneous tripping currents. They are Type B MCB Type C MCB Type D MCB Type B MCB This type of MCB will trip instantly at a rate of three to five times its rated current. These are normally used…

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How to do MCCB maintenance

MCCB Maintenance: Guidelines for Inspection and Preventive Maintenance of Molded Case Circuit Breakers (mccb) Used in Commercial and Industrial Applications. the following MCCB inspections and test procedures listed and explained in details. Inspection of MCCB enclosure Preventative maintenance // Environmental evaluation Interchangeable trip units Wire connectors and connections Mechanical operation tests Insulation resistance tests Individual pole resistance…

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What are the factors to be consider for Specifying Transformer

Generally there are many factors to be consider for Specifying Transformer but the most important factors for specifying transformer is listed below, Kilo volt ampere (kVA) Rating Voltage Ratings, Ratio, and Method of Connection (Delta or Wye) Voltage Taps Typical Impedance Values for Power Transformers Insulation Temperature Ratings Insulation Classes Sound Levels Effects of Transformer…

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What is Feeder and Types of Feeder

Feeders: Feeder line is part of an electric distribution network. An electrical wiring circuit in a building which carries power from a transformer or switch gear to a distribution panel. Different feeders are connected to the feeder bus to feeds different loads like, motor loads, lighting loads, industrial machinery loads, air conditioner loads, transformer cooling…

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Welcome

Electrical Mastar Welcome to Electrical Mastar open and free electrical engineering study site.The  Electrical Mastar website is here to offer tips and also help you to  learn more about basic things in electrical engineering. These website is fully covered by almost all electrical oriented topics. Motor Generator Transformer Battery & Inverter Switchgear Solar Energy Power plants Lighting…

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What is Insulator? Types of Insulator?

Insulator A material or an object that does not easily allow heat, electricity, light, or sound to pass through it.  Air, cloth and rubber are good electrical insulators feathers and wool make good thermal insulators. The overhead line conductors are supported on the poles/ turns with the help of insulator to prevent the flow of…

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