The new IEC (International Electrotechnical Commission) standard, publication 947 “Low Voltage Switchgear and Control, Part 4-1: Contactors and Motor Starters,” has been recognized by UL (Underwriters Laboratories) and is becoming widely accepted by designers and users of motor control in the U.S. This standard addresses coordination between the branch circuit protective device...
Thursday, February 20, 2014
Why Are Copper Bus Bars Plated?
Even though copper is the most popular choice for use in bus bars, and used very often in other electrical applications because it is more resistant to rust and corrosion than other metals, this doesn’t mean that it won’t oxidize over time. When metals oxidize, the resistance in the conductive metal will increase, requiring more power to be used to carry current along the surface....
Wednesday, February 19, 2014
CE marking
The CE marking indicates a product’s compliance with EU legislation and so enables the free movement of products within the European market. By affixing the CE marking to a product, a manufacturer declares, on his sole responsibility, that the product meets all the legal requirements...
IEC 60364 Electrical Installations for Buildings
IEC 60364 Electrical Installations for Buildings is the International Electro technical Commission's international standard on electrical installations of buildings. This standard is an attempt to harmonize national wiring standards in an IEC standard. The latest versions of many European wiring regulations (e.g., BS 7671 in the UK) follow the section structure of IEC 60364 very closely,...
Welding standards (ISO)
International Organization for Standardization (ISO) has developed over 18500 standards and over 1100 new standards are published every year. The following is a partial list of the standards specific to welding: Standard Number Description ISO 2553 ...
Saturday, February 15, 2014
Regulations for the Installation of Electrical Wiring, Electrical Equipment and Air Conditioning Equipment (Qatar General Electricity & Water Corporation "KAHRAMAA")
DOWNLOAD : http://www.km.com.qa/sitecollectiondocuments/service%20regulations/en/regulationsfortheinstallationofelectricalwiringele.pdf ...
Electronic starters and variable speed drives Schneider-electric Cahier technique no. 208
DOWNLOAD : http://www2.schneider-electric.com/documents/technical-publications/en/shared/automation/automation-information-networks/ect208.pdf ...
ABB Guide to variable speed drives
DOWNLOAD : http://www05.abb.com/global/scot/scot201.nsf/veritydisplay/d3c711ec2acddb18c125788f002cf5da/$file/ABB_Technical_guide_No_4_REVC.pdf ...
Thursday, February 13, 2014
Electrical Switchboard Routine Tests
Physical Check · Visual check for any physical damages on the enclosures, paint removal and breakage on components · Paint shade as per the approved drawings. · Cable feeding provisions · ...
Electrical Testing of Low Voltage Switchgear, Panelboards & Switchboards (PEARL)
This "How To" electrical testing document is based on PEARL Reconditioning Standard Section 1300, Revision 5 Low Voltage Panelboards, Switchboards & Switchgear, and discusses relevant test equipment as well as suggested procedures and practices to ensure the quality, safety, and speed of your test-for-reconditioning practices. Introduction: The section of the PEARL Reconditioning...
Electrical Safety Testing Reference Guide
DOWNLOAD : http://www.psma.com/ul_files/forums/safety/estguide2.pdf ...
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