Hospitals' Emergency System Connections
Feb 1, 1999, By EC&M Staff
Hospitals' Emergency System Connections I enjoy testing my NEC knowledge by reading your “Quizzes on the Code” column. I believe your answer to Question...
Solid Grounding For Your Generator
Feb 1, 1999, By Harry L. Masten, P.E., C.P.E.
Generator grounding errors can cause current flow in de-energized circuits. This can cause nuisance tripping of protective circuits, with costly and possibly lethal results....
Emergency Lighting: No More Ugly Duckling
Feb 1, 1999, By Joseph R. Knisley, Senior Editorial Consultant
Once the dread of architects, you can now incorporate emergency lighting fixtures into an innovative design without sacrificing performance....
Ten Easy Steps for Testing Branch Circuits
Jan 1, 1999, By Ken Michaels, F.D. Hayes Electric Co.
A difficult area to evaluate is at the branch circuit/equipment location, because so many things contribute to electronic equipment malfunction....
Ten Tips for Power Assurance
Jan 1, 1999, By Mark Lamendola, Technical Editor
Clean, reliable power seems to be more evasive than ever. Are there guidelines to follow that can ease the problem?...
Quizzes on the Code
Jan 1, 1999, By Fred Hartwell
General rules and definitions—Articles 90, 100, 110...
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...
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....
Beware Of Line-Current Unbalance On VFDs
Jan 1, 1999, John A. DeDad
Severe line-current unbalance can cause VFD nuisance tripping and 3rd harmonic currents, which are unusual for phase-to-phase nonlinear loads.Are you...
1999 Electrical Training Correspondence Course
Jan 1, 1999, By Paul Rosenberg, Consulting Editor
Receive 6.0 continuing education units (CEUs), which are transferable into college hours....
Flexible Voltage Control for Increased Loads
Jan 1, 1999, By EC&M Staff
New device protects distribution circuit from the effects of an erratic local load....
Transfer Switch Jeopardizes Hospital Safety
Jan 1, 1999, By Ralph Crawford, P.E.
Poor heat dissipation from control transformer leads to fire in transfer switch....
Thoughts from our Shop ...
Jan 1, 1999, By Mark Lamendola, Technical Editor
Do you remember a Wall Street Journal headline about how much an overloaded bus was costing a company? Or the Times article about advances in transformers?...
The Basics Of Selecting Overload Relays
Jan 1, 1999, By Paul Frank, Tele-train
Overload relays are inexpensive, but the results of selecting the wrong one for the application can be catastrophic for your motor, process, 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....
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?...
The basics of transformers - Part 3
Jan 1, 1999,
Troubleshooting Discharge Lamp Problems
Jan 1, 1999, By Joseph R. Knisley, Senior Editorial Consultant
Understanding the characteristics of fluorescent and HID lamps makes it easier to recognize problems and simplifies corrective maintenance....
Make Accounting Software Count — Part 1
Jan 1, 1999, By Mark Lamendola, Technical Editor
You've installed accounting software on your computer, but now you wonder why it asks for so much information. What do you need to know about accounting to use this program? And how do you ensure it will be able to manage your accounting needs?...
Power Factor Correction On Single Induction Motors
Jan 1, 1999, Ed Cowern
Sometimes, you need to correct power factor (PF) at a single motor. This means sizing PF capacitors for that motor. The good news is if you size your...
ISU Offers Electrical Training Correspondence Course
Jan 1, 1999, By EC&M Staff
In this issue (on page 34), EC&M begins covering a correspondence course in electrical, electronic, and computerized controls in a series of 12 monthly...
PEARL: Maintaining Higher Standards
Jan 1, 1999, By EC&M Staff
To help structure an essentially unregulated industry, several electrical equipment recyclers and remanufacturers recently formed PEARL, the Professional...
Contracting in the Datacom Arena
Jan 1, 1999, By Paul Rosenberg, Consulting Datacom Editor
In many ways, data contracting is similar to electrical contracting. However, there are quite a few differences. Here are the most important aspects of data contracting; paying extra attention to those areas that differ substantially from electrical contracting....
