Electrical Design Project of a Three Bed Room House (Part 2)

Continued from 1st part: Electrical Design Project of a Three Bed Room House (Part 1) All new domestic dwellings, including conversions, must either have: A fire detection and fire alarm… Read more

Mar 31, 2014 | Sufi Shah Hamid Jalali

Enclosure protection against ingress of solid objects and liquids

As you already probably know, IP stands for Ingress Protection. International Electrotechnical Commission – IEC 60529 “Degrees of protection provided by enclosures (IP Code).”. NEMA offers a similar rating system…. Read more

Mar 26, 2014 | Edvard

Underfloor cable systems explained in details

It should be understood that the generic term ‘underfloor’ applies to products designed for such use but which may well be used in other environments where the protection is appropriate…. Read more

Mar 24, 2014 | Edvard

Electrical Design Project of a Three Bed Room House (1)

Electrical design is not an easy task. It requires a lot of expertise. Detailed study is needed prior to installation work. The engineer must consider quality and any specific requirements… Read more

Mar 21, 2014 | Sufi Shah Hamid Jalali

Electrical Thumb Rules You MUST Follow (8)

Accuracy Class of Metering CT Accuracy Class Letter of CT Accuracy Class of Protection CT Continued from part 7: Electrical Thumb Rules You MUST Follow (Part 7) Metering Class CT… Read more

Mar 10, 2014 | jiguparmar

The Risk Of Deadly Lightning Current and Few Things You Should Know

Lightning currents are load-independent currents, i.e. a lightning discharge can be considered an almost ideal current source. If a load-independent active electric current flows through conductive components, the amplitude of the current,… Read more

Mar 05, 2014 | Edvard

Total Losses in Power Distribution and Transmission Lines (2)

Continued from first part: Total Losses in Power Distribution & Transmission Lines (1) There are two types of transmission and distribution losses: Technical losses (explained in previous part) Non-technical losses… Read more

Mar 03, 2014 | jiguparmar

Practices for grounding and bonding of cable trays

Cable tray may be used as the Equipment Grounding Conductor (EGC) in any installation where qualified persons will service the installed cable tray system. There is no restriction as to… Read more

Feb 26, 2014 | Edvard

Effect of utility-induced surges in a steel mill with variable speed drives

A steel mill with variable speed drives (VSDs) had problems of frequent tripping of the VSDs with the indication overvoltage in AC line. Each tripping caused severe production disruption and… Read more

Feb 12, 2014 | Edvard

What is the short-circuit switching (making / breaking) capacity?

The switching capacity is the r.m.s value of a current at a given power factor cos φ as well as a given rated voltage at which a switchgear or a… Read more

Feb 10, 2014 | Edvard

Electrical Preventive Maintenance of Air Circuit Breakers

Remove and clean interphase barriers. Clean all insulating materials with vacuum and/or clean lint free rags. If it is necessary to use cleaning solvents, use only solvents recommended by the… Read more

Feb 07, 2014 | Edvard

Purposes and Examples of Safety Interlocking Devices

Most switchboards and motor control centres are fitted with a variety of electrical and mechanical safety interlocking devices. Their purposes are to protect against for example: Withdrawing the switching device while… Read more

Feb 05, 2014 | Edvard

Conceptual Model of Smart Grid Framework by IEC

From a communication point of view, each system plays the role of either supplier or consumer of information, or more typically both. In addition to this intersystem communication, these systems… Read more

Feb 03, 2014 | Edvard

MV Circuit Breaker Or Vacuum Contactor? (2)

Continued from first part: MV Circuit Breaker Or Vacuum Contactor? (Part 1) When applied properly, both medium-voltage circuit breakers and medium-voltage fused contactors should provide decades of reliable service. Applied incorrectly,… Read more

Jan 31, 2014 | Mohan Krishnasamy

MV Circuit Breaker Or Vacuum Contactor? (1)

To compare the application of medium-voltage circuit breakers and of fused contactors, we must understand the basic characteristics of each switching technology. Comparison presented here shows the major characteristics of… Read more

Jan 29, 2014 | Mohan Krishnasamy