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Membrane Penetrations in Fire-Resistance WallsAug 1, 2009 12:00 AM |
The Basics of Electrical Overheating
Jun 1, 2009, By Chris Korinek, P.E., Synergy Technologies LLC
Practical tips for identifying and reducing the most common causes of electrical fires...
The Basics of PF Correction on Single Induction Motors
Jun 1, 2009,
How to size capacitors correctly and lower your electrical energy usage costs in the process...
The Basics of Instrument Transformers Part 1
May 1, 2009,
Understanding the potential transformer (PT), a conventional, single-phase transformer that has its primary and secondary windings on a common core...
The Basics of Variable-Frequency Drives
May 1, 2009, By Peter Novak, Fluor, Inc.
How to use various types of VFDs and harmonic mitigation tactics to combat the heat loss that accompanies these devices...
Using Single-Phase Transformers to Create 3-Phase Systems
Apr 1, 2009,
The basics of using delta-connected systems and wye-wye connected systems...
The Basics of Conductor Resistance at High Frequencies
Mar 1, 2009,
With the advent of systems at frequencies above 60 Hz, we've seen increased interest in the rating of cables in these applications. Mainframe computer...
The Basics of Conductor Reactance and Voltage Drop Part 2
Feb 1, 2009,
In the December 2008 issue of EC&M, we talked about calculating the inductive reactance of conductors that are in close proximity to (or touching) one...
Transfer Switches Simplified
Jan 1, 2009, By David Herres, Master Electrician
As backup power sources become more common in residential construction (Photo 1), many homeowners have learned about the needs and benefits of transfer...
The Basics of Vector Analysis Part 4
Nov 1, 2008,
In this last installment, we'll talk about using simple parallelogram relationships and trigonometry to determine neutral currents in balanced and unbalanced circuits....
The Basics of Vector Analysis Part 2
Sep 1, 2008,
Last month, we clarified the definition of a vector and showed you how vectors are added, subtracted, multiplied, and divided. This month, we'll see how...
The Basics of Vector Analysis Part 1
Aug 1, 2008,
What is a vector, and how can we use it in electrical design?...
Calculating Series Voltage Drop
Jun 1, 2008, By Walter Boncal, P.E., Electrical Designers' Reference
Series voltage drop is the progressive loss of voltage that occurs when feeding a string of parallel-connected loads. It's of particular concern when...
Short-Circuit Calculations: The Easy Way
May 1, 2008,
Short-circuit currents represent a tremendous amount of destructive energy, which can be released through electrical systems under fault conditions. Baseline...
Calculating Single- and 3-Phase Parameters
Apr 1, 2008,
Welcome to the first in a series of articles focusing on electrical calculation basics. This month, we'll discuss the most fundamental of calculations...
Letters to the Editor
Dec 1, 2007,
Battery Sizing Basics Article Addendum In the Voice Data Video Today article, starting on page 30 of the September 2007 issue, the author would like to...
