Terminating aluminum cable at motors
Sep 1, 1996, Ganatra, Ravi
Connections made within a motor junction box between motor leads and feeder cables are far more prone to failure than those at ordinary loads. This is...
Why poor power quality causes electronics failures.
Sep 1, 1996,
Why does a two-cycle power outage create havoc with electronic equipment when, sometimes, a three-cycle outage causes no problems?We seem to know so little...
Grounding separately derived systems to water pipes
Sep 1, 1996, Hartwell, Frederic P.
The new paragraph in Sec. 250-80(a) creates questions about the relationship between water piping and separately derived system grounding.One of the most...
The how, what, and where of power conditioning. (part 4)
Sep 1, 1996, Waggoner, Ray
New motor/alternator technologies revolutionize the concept of the uninterruptible power supply.In our last episode of "Power Conditioning," we looked...
Fire pump sources to be reviewed
Sep 1, 1996,
The complaintThe essence of the complaint was that the wrong Technical Committee has been given jurisdiction over the material in Section 6-2 of the Fire...
What causes arcing at steam fitting?
Aug 1, 1996, Lawrie, Robert J.
Q We recently installed a new steam pressure reducing station in an existing 6-m. 150-lb steam line. After reinsulation of the pipe with foil-jacketed,...
The how, what, and where of power conditioning. (part 3)
Aug 1, 1996, Waggoner, Ray
Older motor-generator technology has been updated so that the MG set is still a reliable and viable source of conditioned power.Don't discount old power...
Sizing continuously loaded conductors made simple.
Aug 1, 1996, Hartwell, Frederic P.
Given a calculated load that is at least partially continuous, this updated four-part test assures that the conductors are correctly chosen.Selecting...
Determining DC motor rotation direction
Aug 1, 1996, DeDad, John A.
While DC motors are applied mostly in special applications, knowing how to properly connect them is important to their required performance.You're about...
Be aware of zone system equipment markings.
Aug 1, 1996, Hartwell, Frederic P.
What do the new zone classification system markings mean, and how do they apply to specific equipment applications?Art.505 of the 1996 NEC introduces...
Code applies to some internal wiring.
Aug 1, 1996, Hartwell, Frederic P.
A control circuit that is part of industrial machinery, even machinery listed as a whole, must meet any applicable grounding requirements.We have received...
NEC survives ANSI appeal
Aug 1, 1996,
He said that, under the rules, a panel statement need not be either technical or comprehensive. He also noted that the council decision pointing to panel...
NEMA standards for overload protection need closer look.
Jul 1, 1996, Schindler, Robert
Be careful: You may not have the overload protection you think you have. Two new requirements for overload and stall time that were added to the NEMA...
Controller disconnects with obstructed access
Jul 1, 1996, Hartwell, Frederic P.
Controllers need in-sight disconnects, but does that mean a glass wall could be between the disconnect and the controller?Can a glass wall, which provides...
Pushing the envelope on lighting technology - the upside and the downside
Jul 1, 1996, Knisley, Joseph R.
The Energy Policy Act of 1992 (EPACT) continues to influence the lighting industry, as manufacturers respond with a slew of energy-efficient lamps, while...
Submetering equipment pinpoints peak demand at foundry.
Jul 1, 1996, Parson, Ellen K.
In today's ever-changing economy, companies across the country are striving to lower operating costs and trim their budgets. As a result, an increasing...
The inspection initiative supports electrical inspections.
Jul 1, 1996, Frederic P. Hartwell, Senior Editor
* Inspections can reduce both loss of life and property damage from electrical failures. When qualified electrical inspectors are free to do their work...
The how, what, and where of power conditioning - Part 2.
Jul 1, 1996, Waggoner, Ray
A quick jump to a power conditioning device may not solve the problem and actually may create more of a problem.Let's begin the examination of power conditioning...
'What to know about PID process controllers
Jul 1, 1996, Rosandich, Ryan G.
Hundreds of thousands of PID controllers are used each year to control industrial processes, and it is important to become familiar with their operation.What...
Premium-efficiency motors: soon they'll be law.
Jul 1, 1996, Lawrie, Robert J.
In a little more than a year from now, most of your new motors must meet new efficiency levels mandated by federal legislation.On October 24 of next year...
The how, what and where of power conditioning, part 1.
Jun 1, 1996, Waggoner, Ray
Depending on the situation and problem, power conditioning may not be the solution. And, in the majority of instances, it isn't.At past EC&M Harmonics...
Unusual design issues involved in service change, part 2.
Jun 1, 1996, Hartwell, Frederic P.
A small multifamily dwelling service change uses some innovative construction techniques, some of which could be used in industrial applications.In addition...
Guidelines for engine-generator installations.
Jun 1, 1996, Lawrie, Robert J.
These general guidelines will help you complete the installation of an efficient and reliable genset.Engine-generator sets now have countless applications,...
Guidelines for motor installations.
Jun 1, 1996, Lawrie, Robert J.
A strong working knowledge of installation techniques is vital to the effective operation and maintenance of motors.Today's modern motors require your...
