Systems

 

 

Integrated electrical and low-voltage systems of all types—inside and outside a building—encompass the range of work that electrical contractors do. The articles in this section highlight different types of work, from security, fire and life safety, to traditional electrical power and distribution, to lighting, cabling and more. 

Brady BMP21-Plus label printer

Making labels on the job site can be a time-consuming task for integrated systems contractors, but it can pay big dividends in the long run.


In the last issue, I wrote about the practice of splicing two fibers with a fusion-­splicing machine. This month, I discuss some secrets that experienced splicers have learned—often the hard way.


Figure 1: Notching caused by semiconductor-controlled rectifier switching during commutation period

Maybe it is because they are rarely seen by the human eye or because the proliferation of surge protector strips makes everyone feel immune, but transients still exist and can wreak havoc with electrical equipment.

With cities and utilities worldwide upgrading to light-emitting diode (LED) lighting for streets and outdoor areas, owners and installers wonder when they 
will build in the controls for smart-city applications.

More on Systems

 
The Macrocosm Of Microgrids

TechRepublic.com reported in October 2014 that the United States has more electrical grid blackouts than any other developed nation and that, according to the U.S. Department of Energy (DOE), demand for electricity has outpaced transmission rates by 25 percent every year since 1982.



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A Digital World of Options

As projects become more complex, electrical contractors need high-tech management methods to ensure more efficient results. Here are just a few examples to help you get headed in the right direction. 5pm


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Ultimate Broadband

For the last several months, I’ve been writing about uses for the dark fiber around the country and the world. Last month, I covered delivering broadband to communities, so the logical topic for this month is fiber to the home (FTTH) for broadband delivery. 



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An Emerging Trend

I see a trend in news headlines reporting the reduction of city budgets and personnel. Fire departments have especially become resource-challenged. However, the city officials still urge the fire department management to do more with less.


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Figure 1: Distorted current waveforms from six-pulse converters
Imperfect Harmony

The basic principles of harmonics have been the same since 1822, when Joseph Fourier first proposed that some functions could be composed of an infinite sum of harmonics.


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Time To Adjust

In June 2015, NFPA members met to hear arguments on motions to change the technical committee actions on a number of codes and standards, including the 2016 NFPA 72, National Fire Alarm and Signaling Code.


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Keep the Security

The smart home, Connected technologies, Lifestyle services: No matter how you slice it, if you can enhance and automate the lives of residential customers, you’ll be in a good place for more business.



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