Using overcurrent protection for generator conductors
Dec 1, 1996, Hartwell, Frederic P.
What does the NEC actually require in the way of overcurrent protection for conductors supplied by a generator?One of the more confusing areas of the...
Power resources
Nov 1, 1996,
Transformers, engine-generators, power supplies, and batteries are important components of power distribution systems, and their improved performance...
Transient voltage spikes can harm solid-state starters.
Nov 1, 1996,
Why do these devices, a though generally reliable, sometimes fail unexpectedly?Since their introduction in the late 1950s, solid-state contactors and...
Preventing condensation in 3-phase AC motors.
Nov 1, 1996, Ryan, Thomas J.
Here's how to select and install resistance heaters for reliable operation of motors in damp locations.You can avoid condensation problems in motors by...
Critical data for sizing gen-sets
Nov 1, 1996, Olson, Gary L.
The complexities of modern loads, such as PWM power supplies, variable frequency drives, and other electronic equipment, place a whole new light on sizing...
Calculating temporary power from multiple panels for multiple loads.
Nov 1, 1996, Lawrie, Robert J.
Q We recently had a problem providing temporary power to numerous pieces of 208V, single-phase equipment of various sizes. Sources of power were a number...
What you need to know about operational amplifiers.
Oct 1, 1996, Rosandich, Ryan G.
Once thought to have outlived their usefulness, operational amplifiers are as popular today in control applications as they ever were.While many predicted...
Controller ratings for elevator motors.
Oct 1, 1996, Hartwell, Frederic P.
Reduced starting currents don't justify derated controllers, but different motor time ratings may affect required horsepower ratings.An elevator service...
Focus on the fundamentals of shielded MV power cable
Oct 1, 1996, Lisker, Lowell; Tucker, Gerry
MV power cables are perceived as commodities, but are all makes alike?Shielded, 90 [degrees] C (Type MV-90), medium-voltage(MV) power cane (5kV to 35kV)...
Reliable power is money in the bank
Sep 1, 1996, Rowe, Louis E.
Electrical design based on total reliability results in smooth operations and client satisfaction at recently constructed bank site.When lightning strikes,...
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...
Using single-phase transformers to create 3-phase systems.
Aug 1, 1996, DeDad, John A.
Many older industrial facilities use single-phase, oil-filled transformers made for pole-mounting but installed at ground level to create 3-phase power...
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,...
What to know about variable-voltage transformers.
Jul 1, 1996, Morgan, Robert B.
How can you adjust a transformer's voltage range from just a few volts to over 100% input voltage?Variable-voltage transformers are efficient means of...
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...
