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...More
During the 2005 National Electrical Code (NEC) review cycle, a relatively simple revision was made that created a significant change on the cathodic protection (CP) systems of petroleum and chemical facilities (plants)....More
Every commercial occupancy needs a form of identification, the standard method of which is typically the electric sign. This is one reason why you'll be working with Art. 600 if you do much commercial or industrial work....More
Short-circuit currents represent a tremendous amount of destructive energy, which can be released through electrical systems under fault conditions. Baseline...More
Welcome to the first in a series of articles focusing on electrical calculation basics. This month, we'll discuss the most fundamental of calculations...More
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...More
Rationalizing an investment in a facility's infrastructure can be a difficult prospect for any plant engineer or technician, often requiring extensive...More
Confusion continues to surround the use, performance, and NEC requirements of isolated ground (IG) wiring. Can it be used anywhere, or is it restricted...More
When it comes to fire pumps, there's more to designing and installing these units than meets the eye. As projects become larger and more complex, such...More
In Part 2 of this article (August 2007), we described multipoint (or common-type) supplemental grounding and bonding between the T(M)GB [notation used...More
In Part 1 of this article (July 2007), we described (per the Emerald Book and ANSI J-STD-07-A) supplemental grounding and bonding from the grounding electrode...More
Site power and grounding audits/evaluations of commercial and industrial locations routinely identify electrical power system grounding and bonding problems....More
Although it's one of the most important aspects of electrical design and installation, grounding continues to be one of the least understood and most...More
A specialized segment of the electrical construction and maintenance industry, AC motor control is an area that requires specific knowledge in order to...More
Replacing many older aircraft ground servicing electrical systems, solid-state frequency inverters (SSFI) are primarily being used these days as a cost-savings...More
Aluminum building wire installation can be an uncertain subject for electricians, engineers, inspectors, and owners. There are many myths, beliefs, and...More
Prior to about 15 years ago, the basic methodology for ground testing remained fundamentally unchanged since it was originally devised in the early 20th...More
Have you done any service work lately, and noticed a spark as you connect or reconnect the grounding electrode conductor to the ground rod of what appeared...More
A separately derived system is a premises wiring system with no direct electrical connection to conductors originating from another system . All transformers, except autotransformers, are separately derived because the primary circuit conductors do not ......More
You basically perform work on two types of systems: solidly grounded or ungrounded. The general requirements for grounding and bonding these systems can be summarized as follows...More
Electrical ladder drawings are still one of the common and reliable tools used to troubleshoot equipment when it fails. As with any good troubleshooting tool, one must be familiar with its basic features to make the most of the diagram in the field....More
With all of the new products and electrical insulation kits currently on the market, the use of conventional electrical tapes has gone down. As a result,...More
LEDs have unique and compelling characteristics that make them ideal for industrial lighting applications. But there are a variety of misconceptions about LEDs, how well they work, how long they last, and more. Digital Lumens developed this whitepaper to dish up the facts around LEDs and address some common misunderstandings....More
An arc flash is associated with the explosive release of energy caused by an electrical arc, due to either a phase-to-ground or a phase-to-phase fault. This kind of fault can result from many factors – a dropped tool, accidental contact with electrical systems, buildup of conductive dust, corrosion or improper work conditions.....More
Abstract: In this webinar, Mike will not only explain the current NEC requirements for GFCIs and AFCIs, but he'll explain how they operate, what causes their premature failure, and when they won't provide the safety protection you might have thought they would.
Abstract: This webinar will teach attendees the difference between risk and hazard, and how the choice of system grounding has a direct impact on reliability and safety.
