Thursday, February 27, 2014

Tuesday, February 25, 2014

Terms AC1 and AC3

  12:49 AM Blogger   No comments   Edit
AC-1 - This category applies to all AC loads where the power factor is more than 0.95. These are primarily non-inductive or slightly inductive loads, such as heating. Breaking the arc remains easy with minimal arcing and contact wear.   AC-3 - This category applies to squirrel cage motors with breaking during normal running of the motor. On closing, the contactor makes the inrush...

Monday, February 24, 2014

Advantages of LED light bulbs

  11:20 PM Blogger   No comments   Edit
How far the light bulb has come. For years incandescent bulbs were the only game in town. But in more recent times consumers have seen new choices come along, such as compact fluorescent light bulbs (CFLs) and light-emitting diodes (LEDs). Sometimes people prefer a certain type of light bulb for the impact they hope it will have on the environment, and other times people choose bulbs based...

Friday, February 21, 2014

KW to Ampere calculation

  7:37 PM Blogger   No comments   Edit
DC kilowatts to amps calculation The current I in amps (A) is equal to 1000 times the power P in kilowatts (kW), divided by the voltage V in volts (V): I(A) = 1000 × P(kW) / V(V)  AC single phase kilowatts to amps calculation The phase current I in amps (A) is equal to 1000 times the power P in kilowatts (kW), divided by the power factor PF times the RMS voltage V in volts (V): I(A) = 1000...

Thursday, February 20, 2014

Understanding Type 2 Coordinated Protection in Motor Branch Circuits

  12:52 AM Blogger   No comments   Edit
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...

Wednesday, February 19, 2014

Why Are Copper Bus Bars Plated?

  11:38 PM Blogger   No comments   Edit
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....

Tuesday, February 18, 2014

IEC 60364 Electrical Installations for Buildings

  9:12 PM Blogger   No comments   Edit
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,...

Friday, February 14, 2014

Wednesday, February 12, 2014

Tuesday, February 11, 2014

Tuesday, February 4, 2014

Subscribe to: Posts (Atom)