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. 

Figure 1: Typical magnitude of voltage sag as percent of nominal compiled of EPRI DPQ Project in 1990s

A customer recently called me about the information on his power quality monitor screen. He said about a dozen different events were showing up, but the lights had just blinked once. He wanted to know what all of the other nonsense was supposed to tell him.

Last month, I wrote about how fiber was being used to expand bandwidth for cellular systems, connecting cell towers to the phone network and antennas on the tower to the base electronics. That helps our phone coverage when we’re driving or walking outside.

Workflow-management tools are designed to orchestrate everyday business processes. For example, a contractor may implement a process for submitting, reviewing and approving expense reports.

While the electric power industry rapidly changes, utilities and building owners will need to accurately model the engineering and economic operations of the power system to make informed decisions, so they require sophisticated modeling-software tools.


More on Systems

 
Highlights on New Category 6 Standard
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The Telecommunications Industry Association (TIA) has published its long-awaited standard for Category 6 data cabling and components. Officially known as ANSI/TIA/EIA-568-B.2-1, the standard is an addendum to the TIA/EIA-568-B standard for commercial building telecommunications cabling.

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IT Decision Makers Prefer Category 6, Survey Says
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BASKING RIDGE, N.J., Nov. 4 /PRNewswire-FirstCall/ -- Avaya Inc.

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Fiber's Biggest Enemy
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Your mother was right--dirt is bad. Cleanliness can be next to impossible on the jobsite, but when it comes to fiber optics, it's mandatory. The problem is simply that fiber itself is small, about the size of a human hair.

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Simultaneous Disconnects, Generator Wiring and More
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CODE CITATIONS Article 100 Definitions Article 210 Branch Circuits Article 230 Services Article 250 Grounding Article 312 Cabinets, Cutout Boxes and Meter Socket Enclosures Article 445 Generators Article 518 Places of Assembly Disconnect for multiwire branch circuit Q: There was a requirement in the

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Flood of Products Hits as VoIP Tide Breaks Strong
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The giant wave washing over low-voltage technology is VoIP (voice over Internet protocol). Anticipating contractors’ needs, vendors introduced a flood of products to the market.

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Construction IT--Where Now?
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The dot-com nuttiness is over. Were there doubt about that, it was confirmed at the A/E/C Systems 2002 show in June in Anaheim, Calif. There were a few dot-coms, but for the most part, exhibitors--and speakers at construction industry sessions--were moving on.

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Card Access with All the 'Smarts'
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In access control, the innovation never stops. In the cards themselves and the readers, technology has stepped up to provide the highest levels of security ever.

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