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. 

Electrical contractors used to focus on the initial construction phase of a building. This was the “bread-and-butter” phase where contractors made their money. That business model is not the model for today or tomorrow.

Monumental video growth continues in every sector, ranging from small business to mission critical. Surveillance cameras are part of the Internet of Things boom, morphing into smart data collectors like billions of other connected devices.

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.

Figure 1: Voltage and current transients during switching

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.

More on Systems

 
Order In The court: Frey Electric Provides Security
by Staff |

In the aftermath of 9/11, Americans everywhere reflected on their most cherished ideals: liberty, freedom and justice.


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Internet Protection for End-Users

Enter the National Cyber Alert System One of the newest “systems” on the government block is the early warning system that alerts those in the know to potential Internet risks. It is not only timely, but also much needed.


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Airport Security Moves to Exits
by Staff |

Airport travelers are accustomed to scrutiny at screening checkpoints. Metal detectors and security personnel posted at the concourse entrance have been a fact of life for years.


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Number of Conductors in an Outlet Box, Connecting Ground Rods and More

CODE CITATIONS Article 250 Grounding Article 314 Outlet, Device, Pull and Junction Boxes; Conduit Bodies, Fittings and Manholes Article 430 Motors, Motor Circuits and Controllers Article 440 Air Conditioning and Refrigerating Equipment Article 517 Healthcare Facilities Article 695 Fire Pumps Overcur


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Private Security

VPNs offer privacy over a public backbone From a systems standpoint, security always seems to make its way to the top of any task list.


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The Trouble with Mismatched Fibers

Careful documentation can help Gone are the days when all fiber optic cables were the same. Most building cables had 62.5/125 micron multimode fibers for LANs or security systems, while outside plant cables were all single-mode fiber.


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Make Data More Productive

Improving the information flow Real-time data is a hot commodity in technology-for-business circles right now. The interest is mostly coming from big companies, but that doesn’t mean it’s not for you. Real-time data is useful to even the smallest contractor with employees.


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