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RESIDUAL CURRENT DEVICES: WHAT IS RCD AND WHAT DOES IT DO?

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RCD or Residual Current Device is a generic term which covers both RCCB (Residual Current Circuit Breaker) and RCBO (Residual Current Circuit Breaker with Overload).














What Is RCD? RCD is a protective device in electrical system which automatically disconnect the supply system  when imbalance detected in the value of phase and neutral current. British Standard BS 7671 defined RCD is as below: A mechanical switching device or association of devices intended to cause the opening of the contacts when the residual current attains a given value under specified conditions. The protective device RCD actually protect- direct and indirect contact, fire and thermal effect. For clear understand the difference between RCD and other broadly used Circuit Breaker, we should remember the  definition of RCCB, RCBO, ELCB, GFCI etc. RCCB (Residual Current Circuit Breaker) is an electrical protective device that break or disconnects the circuit to become in safe mood whenever it detect an unbalance current flo…

HVAC EGINEERING DICTIONARY

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Some times it become difficult to describe the known terms clearly to others. This article for the guy who works with HVAC, the terms related to HVAC system that everyday you use, keep in saved, may need at necessary.
ABSOLUTE HUMIDITY - The weight of water vapor in a given amount of air. ABSOLUTE PRESSURE - Pressure measured with the base of zero. ABSOLUTE TEMPERATURE - A temperature scale expressed in degrees oF or oC using absolute zero as a base. Referred to as the Rankin or Kelvin scale. ABSOLUTE ZERO - The temperature at which molecular activity theoretically ceases. -456.69 F0 or -273.16 oC. AIR CONDITIONING - The process of controlling the temperature, humidity, cleanliness and distribution of the air. AIR, Standard Conditions - Conditions at which capacity ratings for air conditioning equipment is rated. AMBIENT - Refers to the temperature surrounding a body or unit under test. ATMOSPHERIC PRESSURE - The weight of a 1 unit column of the earth's atmosphere. BIMETAL - Two m…

WHAT SHOULD BE BATHROOM WIRING STANDARD

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What Is The Specialty For Bathroom Wiring Than Others?
Yes, I am not meaning latest fashion about your bathroom. As a talk from an Electrical Engineer, I am talking about your bathroom safety fashion from the point of Electrical Engineering. You may be thinking, why different wiring need for bathroom, what is problem with same others wiring.

From the note of expert on wiring accessories like legrand  we can quote as following that will give us basic idea about bathroom wiring exception.





“The wiring regulations are very strict. Every switch or other means of electrical control or adjustment shall be so situated as to be normally inaccessible in the bathroom. The required Ingress protection is managed through a series of defined zones progressively from the bath or shower. Pull cord switches are allowed, shaver sockets with isolating transformers are also allowed but should conform to BS EN 61558-2-5”. Especial Zone Rules In Bathroom System
Especial rules apply to bathroom wiring where the r…

FINALLY UNVEILED THE ULTIMATE SECRECY OF PAGE RANK IMPROVEMENT FOR BLOG

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How You Unveil The Ultimate Secret Point To Improve Page Rank Of Your Blog ?

As a Blogger, everyone desire to get a high page rank to his blog; high page rank means Google including all search engines like your website and make visible to much more visitors.  Ultimately, you will get more traffic and your blog post will be hit by more visitors.

Before unveil the secrecy to get high page rank for a blog, we would like to discuss the king rules of page rank for a blog or website. If we don’t know the  scope or  pre-condition of page rank for a website, may our works will to astray.

Some website contains huge potential to get good page rank, but not getting in just time due to lack of proper SEO (Search  Engine Optimization). Oppositely any website can not get high page rank if does not contains quality contents.
King Rules To Improve  Page Rank For Blog 
Before go to the king rules to improving the page rank of your Blog, remember-

“Don’t follow any model blindly , Be a model;
Someone may fo…

Relays: LEXIS OF RELAY

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What Is Relay? How Do Relay Work?Relay a device that opens or closes a contact when energized. Relays are most commonly used in power systems, where their function is to detect defective lines or apparatus or other abnormal or dangerous occurrences and to initiate appropriate control action. When the voltage or current in a relay exceeds the specified “pickup” value, the relay contact changes its position and causes an action in the circuit breaker. A decision is made based on the information from the measuring instruments and relayed to the trip coil of the breaker, hence the name “relay.” Other relays are used as switches to turn on or off equipment.If you look at these two figure, you will find the very first basic idea, how relay make automatic a circuit just using the control circuit.Types of Relay Relay is nothing but an open or closed switch, but for the purpose and place of used relay may be different types or named. Relay may be used in HVAC, Appliances, Security, Pool & …

DRAWINGS DIAGRAMS AND CALCULATIONS FOR UNDERGROUND CABLE PROJECT

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General Requirements And Importance Of Drawings-Diagrams For Underground Power Cable ProjectThe employer may engaged or contract with service-provider to execute an underground power cable project, service-provider actually carry out the whole works as per employer requirements. Here in this article we would like to focus on general requirements and importance of various drawings, designs and calculation sheet to execute an underground power cable project.

The term “drawing” should also included here diagrams, schedules, performance curves, and calculations etc. required for the comprehensive design of the works. The Service Provider should be responsible for the provision of all drawings required for the various stages of the Contract to execute the project.
All drawings, apart from workshop drawings, should be submitted to the nominated Engineer for his approval, in accordance with an approved program. The Service Provider should ensure that drawings are submitted for approval in pri…

SURGE ARRESTERS SPECIFICATION FOR 132 KV & 33 KV LINE

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What Is Lightning Arrester Or Surge Arrester?



In a simple and shortly we can say surge arrester or lightning arrester is a device used in electrical power system to protect others equipment from switching surges or high energy lightning surges.

If you are hearing the terms “lightning arrester” or “surge arrester” very first time and thinking, it’s like something “police arrest terrorist”! Yes, you not quite wrong; lightning or surge like a destructive terrorist for electrical power system, surge arrester works like a police man, catch it and send to ground before destruct the system equipment.
Don’t confuse lightning or surge arrester with lightning rod, surge suppressor or TVSS. Lightning Rod is a grounded potential device that divert the lightning surge; Suppressor is a lightning diverter device that uses in low voltage (below 1000V) system; TVSS is Transient Voltage Surge Suppressor used for divert the transient surge in low voltage (below 100v) system.

So as summary, we can say surge or …

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