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. 

Since 1999, the National Fire Alarm and Signaling Code has required survivability for certain circuits that need to work during a fire. In truth, the code has always required speaker circuits serving emergency voice/alarm communications systems to meet a performance requirement for survivability. 


Figure 1: Special manual building evacuation station. Photo courtesy of Jensen Hughes Inc.

Recently, a number of inquiries were made to our office regarding the topic of delaying or preventing the activation of fire alarm notification appliances.

As the nation's energy mix evolves to comprise an expanding supply of green power, its distribution systems must also keep up with those changes. The U.S. Department of Energy (DOE) is supporting research toward that end to encourage greater modernization and resiliency on the grid.

As data about home energy use expands, the next big thing could come from new products and services companies create to analyze and use that data.

More on Systems

 
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Cabling Infrastructure In Buildings: Material For Terrorists?

What we have been installing in buildings and data centers for years that could be a lethal element for a terrorist attack?


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Battery Storage Technology Expanding Worldwide

Renewable generation and energy storage technology have evolved at a similar pace in recent years. Their mutually beneficial relationship is no mystery.


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Systems Efficiency Is the Key to Building Energy Optimization

A new report, "Going Beyond Zero: A Systems Efficiency Blueprint for Building Energy Optimization and Resilience," published in May by the Alliance to Save Energy (ASE), focuses on how to better capitalize on new technologies that allow "smarter interactions of components" within and among various b


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Low-Voltage Cable Market Set To Grow


While low-voltage cable often refers to what is used to wire audiovisual and fire alarm equipment, it also describes lower voltage electric grid distribution cable, as contrasted with the high-voltage cable used on transmission lines.


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Figure 1: Voltage and current transients during switching
Both Sides Now: PQ Monitoring Systems


Engineers in a large electric utility’s power quality (PQ) department had installed PQ monitoring to determine the source of a system component’s failures. They needed to see the voltage and current waveforms before, during and after the cap banks were switched in and out.


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Taking The Fiber Wheel

Six years ago, with no experience as an internet service provider (ISP) or telecom service provider, Google Fiber generated an immense amount of excitement by announcing that the company was going to build a gigabit-speed fiber-to-the-home (FTTH) network for Kansas City, Mo., a city chosen from more


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Changing Expectations: Getting More From Access Control

Access control is one of the most prevalent and longstanding methods of securing entrances, exits and areas within protected premises.


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