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. 

Design/build means different things to different people. Regardless, you should know that it places more responsibility on your shoulders as the electrical professional. It means you need to stay abreast of the codes that affect your installations.


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.

More on Systems

 
Redundant Grounding in Patient Care Areas
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Redundantly grounding all electrical equipment in a patient care area has provided one of the most critical pieces of a very complex puzzle involving patient protection.

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The Proliferation of Wireless Networking
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Wireless networking is a growing segment of the voice/data/video (VDV) market offering a great deal of opportunity for the electrical contracting firm.

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Abandoned Fire Alarm Cables, Conductor Derating and More
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CODE CITATIONS Article 90 Introduction; Article 110 Requirements for Electrical Installations; Article 210 Branch Circuits; Article 220 Branch-Circuit, Feeder and Service Calculations; Article 250 Grounding; Article 300 Wiring Methods; Article 310 Conductors for General Wiring; Article 400 Flexible

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Cabling on a Shoestring
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It doesn’t always take cutting-edge technology to launch new applications, although that certainly has been the case for the most part in low-voltage in recent years.

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Saved by the Bell
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Educational construction continues to lead the non-residential market in new construction spending.

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Wiring Air Conditioning and More
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CODE CITATIONS Article 210 Branch Circuits Article 250 Grounding Article 300 Wiring Methods Article 310 Conductors for General Wiring Article 334 Nonmetallic Sheathed Cable: Types NM, NMC and NMS Article 422 Appliances Article 518 Places of Assembly Article 700 Emergency Systems Wiring air condition

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Fiber Optic Update
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Fiber optics, as we all know, has not had a very good time the last couple of years, with the overall market dropping by almost 80 percent (see chart at top right).

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