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

 
PVC Conduit Underground, Disconnect for Residentia
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CODE CITATIONS Article 210 Branch Circuits Article 220 Branch Circuit, Feeder and Service Calculations Article 250 Grounding Article 352 Rigid Nonmetallic Conduit: Type RNC Article 422 Appliances Article 430 Motors, Motor Circuits, and Controllers Article 514 Motor Fuel Dispensing Facilities Article

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Planning a Fire Alarm System Installation
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Developing a ‘specialty’ crew is important The fire alarm system installation for most new building projects inevitably is a Division 16 responsibility.

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The DER Niche Market
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Electrical contractors working for utilities or interested in a growing niche market might do well to investigate opportunities in distributed energy resources (DER). They are parallel and stand-alone electric generation units located within the electric distribution system at or near the end-user.

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Article 210--Branch Circuits: Required Lighting Outlets, Part II
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210.70 Lighting Outlets Required The National Electrical Code states its purpose as “the practical safeguarding of persons and property from hazards arising from the use of electricity.” [90.1(A)] The adequacy of the Code is covered in 90.1(B).

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Fuel Cells--Power Source for the Future
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It has been three decades since fuel cell technology first emerged, but the clean and efficient power alternative is just now beginning to take off.

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Homeland Security: Contractors Vie for New Systems Installations
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Without a shadow of a doubt, the events of Sept. 11, 2001, changed the world. Our understanding of what it means to feel safe and secure were forever altered.

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Call to Action to Protect Government Facilities
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The attacks of 2001 may be in the past, but efforts to fortify government facilities against terrorist acts continue. A crucial turning point came for the United States on the morning of Sept. 11, 2001. It was then that the people of the U.S.

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