Simple questions to tackle audits or troubleshooting jobs Last month's article focused on having the right tool for the job. When conducting a power-quality audit or carrying out a troubleshooting job, the right tool is just one part of the process.
It can save hours of work and a lot of money While doing some construction work recently, I needed a tool that was in my truck, but didn’t feel like going to get it. So I tried to “make do” with what I had in my toolbox.
Article 210 Branch Circuits Article 250 Grounding Article 310 Conductors for General Wiring Article 320 Armored Cable: Type AC Article 404 Switches Derating Cables Q: Is it necessary to derate types NM-B, AC or MC cables where these cables are bundled to enter a branch-circuit panelboard?
Dedicated 20-ampere branch circuits are required Most dwelling units are required to have a laundry area within the living area or have a laundry area provided on the premises for a multifamily building.
Casinos and hotels must keep the power flowing Any industry that depends on electricity to generate revenue knows that the quality of the electrical supply isn’t always what is needed to keep the revenue stream flowing.
Article 110 Requirements for Electrical Installations Article 250 Grounding Article 310 Conductors for General Wiring Article 312 Cabinets, Cutout Boxes and Meter Socket Enclosures Article 430 Motors, Motor Circuits and Controllers Article 518 Places of Assembly Thermostat as motor disconnect Q:May
Power supply design determines an appliance’s energy profile On the plane coming home from the Institute of Electrical and Electronics Engineers Power Engineering Society meeting, I was proofreading a paper that proposed to convert our way of looking at power-quality phenomena from sags, swells, tra
Inrush and the laws of physics Trying to explain power quality phenomena and even electrical concepts in general often results in attempts to translate them into a different domain, such as the mechanical world.
Public transportaion is more vulnerable than you might think Power quality and the problems that arise when the quality of the supply doesn’t match the requirements of the equipment are most often thought of in terms of the resulting loss of productivity in commercial applications such as data cent
Concerns about the efficiency and reliability of electricity are prompting new responses by federal and state government agencies, utilities, associations and product manufacturers. They could provide new business for electrical contractors if you can position your company for these opportunities.
PQ safety is often overlooked, despite the danger Part of any power quality seminar material should cover the aspects of safety, especially for anyone who must connect/disconnect the voltage and current probes for power quality monitors.
220.19 Electric Ranges and Other Cooking Appliances Specifications for calculating branch-circuit, feeder and service loads are in Article 220 of the National Electrical Code. This article is divided into four parts: I. General, II. Feeders and Services, III.
Power quality problems lurk Stories about an increase in productivity in the commercial and industrial worlds attributed heavily to the growth in information technology (IT) equipment. In fact, this number has been put at $46 billion for the 2003 fiscal year.
How does electronic equipment know the difference? In past articles, we have covered the concept of harmonics, which are usually defined as frequencies that are integer multiples of the fundamental frequency.