Electrical fire extinguisher

15/06/2011 by Leave a Comment

Fires as we known have a several class was identification with specific heat sources.For fire cause by electrical,it include in class C.So for electrical fire,we must used a suitable fire extinguisher to avoid serious damage or can cause others danger.

We cannot used fire extinguisher from water base because it can cause electric shock.Many case around the world happened when firefighter death and injury due to electrical shocked.

It also can cause a serious damage for electrical and electronic equipment nearest the fire incident happened if we used wrong or not suitable fire extinguisher such as water,dry powder,foam and others. read more

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Low speed protection for A.C generator

29/03/2011 by 1 Comment

For a given excitation,if speed of an A.C. generator is reduced then the output voltage would reduce also.In practice,this reduction in output voltage is sensed by the AVR ( Automatic voltage regulator ) which increases the excitation current to compensate.

However,the field forcing capabilities of the AVR which are necessary to maintain output voltage during rapid load changes,will permit an “over-excitation” condition to exist.

As the regulator is not speed ( or frequency) sensitive,field forcing would occur damage field windings and rotating diode.In order to safeguard the machine against this condition,particularly where low speed duty or idling is anticipated a LSP ( low speed protection ) unit is available to sense prolonged over-excitation and automatically insert current limiting resistance in the field circuit. read more

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How to use a multimeter?

16/09/2010 by 8 Comments

Ok..this time i want share with all of you about the basic knowledge it must have to all electrician in the world.Because this instrument is very important in electrical field.So i would like to share my video :

HOW TO USE A MULTIMETER?

I show detail how to measure OHMS,AMPERE,VOLT,FREQUENCY,CAPACITANCE,DIODE and many more..

Stay tune and watch my VIDEO…Feel free to drop your comment :D

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Digital AC Clamp Meter

14/09/2010 by 7 Comments

What is Digital AC Clamp Meter / Clamp on meter ?

This instrument has been design for the main purpose is measuring the AC AMPERE .

I have one Digital AC Clamp Meter brand KYORITSU model KEW SNAP 2017.

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Molded Case Circuit Breaker

12/09/2010 by 4 Comments

What is MCCB ( Molded Case Circuit Breaker ) ?

It is a mechanical device ( BS 4752 ) to be used to connect and disconnect the circuit in normal and abnormal.Current rate for regular MCCB up to 3000 ampere.

It is only available in a 3 pole only, usually for a system that has a high ampere ratings in three ( 3 ) phase systems.For those who have ampere ratings than 400 ampere, the safety interlock system is prepared for security purposes because the current system are high.

There are two ( 2 ) types of MCCB commonly used in industry, it was: –

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Protective Device Introduction

30/08/2010 by Leave a Comment

What is protective device introduction?

Electrical distribution systems are often quite complicated. They  cannot be absolutely fail-safe. Circuits are subject to destructive overcurrents. Harsh environments, general deterioration, accidental damage or damage from natural causes, excessive expansion or overloading of the electrical distribution system are factors which contribute to the occurrence of such overcurrent.

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