Protective Equipment: Up Front And Personal
May 1, 1999, By Mark Lamendola, Technical Editor
Is your body on the injury "hit list," or do you use the "tools of the trade" (personal protective equipment) for protection? Using safety equipment could save your eyesight and more....
Technical Note on Inductance of Fuses in High-Frequency Power Electronic Circuits Released
Apr 1, 1999, By EC&M Staff
In response to the increasing use of semiconductor fuses to protect IGBT inverters against the effects of short-circuit faults, Gould Shawmut, Newburyport,...
Ten Tips For Effective Electronic Drawing
Apr 1, 1999, By Wantao Zhou, Visio Corp.
You e-mailed your drawings to the CAD firm days ago for inclusion in a set of master drawings. Why are they taking so long to make a few modifications and get back to you? What was that remark from accounting about an extra charge for the work, and what's this lawsuit all about?...
Matching Motor Torque To Your Load
Mar 1, 1999, By Robert J. Lawrie, Senior Editorial Consultant
You must consider steady-state, acceleration, and starting torque to ensure the lowest motor operating costs....
Available Fault Current?
Mar 1, 1999, By EC&M Staff
The Article “ What’s My Short-Circuit Value,” on page 48 of the EC&M February ’99 issue, infers the Utility Company doesn’t have to answer inquiries of...
Get Close to Remote Monitoring
Mar 1, 1999, By Bart Cotton, Data Power Monitoring Corp.
Before disaster strikes, will your power monitor predict it or tell you what happened?...
Power Monitoring Can Empower You
Mar 1, 1999, By Rudolf S.v. Carolsfeld
Knowledge is power. But what do you really know about your power? Can you take action on useful information, or do you merely have a flood of data?...
What's My Short-Circuit Value?
Feb 1, 1999, By Jerry R. Borland, P.E., Technical Editor
Here's why your electric utility won't and sometimes can't give you an available fault current value....
Don't Get Zapped By Cable Clearance Over Water
Feb 1, 1999, By Donald C. Thorn, Ph.D., P.E.
After a sailboat comes in contact with a low utility power line, attorneys look to forensic engineering for answers to the fatal accident....
Unconventional Transformer Connections — Part 3
Feb 1, 1999, By Scott Falke, ozone@ieee.org
Using ordinary single-phase transformers in unusual applications can have extraordinary benefits. We'll examine three more configurations here....
Tap Changers: To Tap or Not To Tap?
Jan 1, 1999, By Jerry R. Borland, P.E., Technical Editor
In the winter, your facility experiences an extremely high amount of relamping. In the summer, your process line motors take a long time to reach synchronous speed. What's the problem: High voltage, low voltage, or both?...
Is There Nowhere to Go with CAD Technology?
Jan 1, 1999, BY EC&M Staff
Fortunately, computer-aided design (CAD) is a recognized tool in the electrical industry. Until recently, architects, contractors, and engineers have...
Don't Be Felled By Higher Fault Currents
Jan 1, 1999, By Vincent Saporita, P.E.
When you look at your system upgrades and additions, be sure to consider increases in available fault current. Here's when and how you might engineer a solution....
More on Why Main Fuses Blow Before Branch Fuses
Jan 1, 1999, Edited by Robert J. Lawrie
Why does a main fuse blow instead of the 15A or 20A branch fuse? After checking every branch circuit in the panel with a multimeter, I find no problem....
Selecting Torque for Top Motor Efficiency
Jan 1, 1999, By Robert J. Lawrie, Senior Editorial Consultant
Sure, horsepower is an important motor parameter. However, torque is just as important. That said, what exactly is torque? It really depends on your point...
