Miniature Circuit Breaker Sizing

04/02/2011 by 64 Comments

When we design or build a electrical installation,we must know how to choose the suitable circuit breaker for the any application that we design.For electrician,this is compulsory knowledge.So here i want share my little knowledge about circuit breaker sizing method.

This calculation for sizing the miniature circuit breaker.For other circuit breaker likes MCCB,ACB,VCB,OCB and etc,it have a additional factor and calculation that we must consider.

For that why i will discuss it in my next post…so this time i want explain the simple way how to sizing the miniature circuit breaker for our application. read more

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Residual Current Circuit Breaker

23/01/2011 by 7 Comments

This device is important in electrical wiring installation.It is a life guard device to protect from electric shock.Others circuit breaker only can detect the fault from over current and short circuit but cannot detect the current leakage.

That why RCCB is very important.Only this device can detect the current leakage.The current leakage can cause the injury or dead for human and can lead to fire hazard.When design the distribution panel board,please make sure this device include in our planning to install..it for consumer safety and avoid equipment from damage. read more

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Magnetic Contactor

21/01/2011 by 5 Comments

Magnetic contactor is common used in automation industry for motor control application.It is function basically like “relay”.The power source into the coil of winding,it like the solenoid operation.It can delivery a big ampere to  the loads and very long lasting and high durability.

When the power is “on”,it energized the coil and make plunger move and the switch contact is change from normally open to closed position.It allowed the current move from input terminal to output terminal.Then if we connected to the 3 phase motor,it will running :D

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Direct on line starter

08/10/2010 by 32 Comments

Around the world it famous with name DOL starter or direct on line starter.This is the most common starting method available on the market and at basic stater for all motor application.The starting equipment consists of only a main contactor and thermal or electronic overload relay.The disadvantage with DOL starter is that it gives the highest possible starting current.

A normal value is between 6 to 7 times the rated motor current but values of up to 9 or 10 times the rated current exist.Besides then DOL starter draw the starting current there also exists a current peak that can rise up to 14 times the rated current since the motor is not energized from the the first moment when starting. read more

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Motor Overload Protection

07/10/2010 by 9 Comments

Overload protection is installed in the main control circuit or power line of motor to protect from damage due to mechanical malfunction overload conditions when it is running.

The effect of an overload is an excessive rise in temperature in the motor windings due to current higher than full load current.

Properly sized overload protection disconnects the motor from the power supply when the heat generated in the motor circuit or windings approaches a damaging level for any reason. Read More

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How to install 3 phase socket outlet?

18/09/2010 by 5 Comments

Socket outlet is used more widely in the home or industry to connect the electrical power to the equipment or appliances.We can found many types of socket outlet with nominal voltage rated for single and three phase.

Before we install any types of socket outlet,please calculate the full load ampere and make sure the socket outlet rated ampere is suitable with load.If not a socket outlet will burn or broken due to overload current.

This time, I will show how the correct way to install a socket outlet for three phases system.BUT before start any works…MAKE SURE all power supply already switch off or disconnected.Put the signage or tag at the  fuse box for safety purpose.

Socket outlet installation

 

Feel free to watch my VIDEO and drop your comment or any question for further discussion.

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