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. 

I often receive data files recorded from power quality monitors to analyze the reason a piece of equipment experienced an event. This analysis is followed by determining the cause and who is to blame.

If you buy a new car in 2040, there’s a better than 50/50 chance it will be powered by electricity rather than gas.

Electronic access control is one of the most proprietary technologies (beside fire alarms) with the largest installed base of legacy equipment in the physical security industry.

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. 


More on Systems

 
Catch a Wave

Many fiber optic specifications and tests refer to wavelength because most parameters have some wavelength dependency. Attenuation, for example, is caused by absorption and scattering. Absorption occurs at certain wavelengths and scattering gets less significant at longer wavelengths.


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E-J Electric Builds Two 500 MW Power Plants

Across the East River from Manhattan, construction workers are erecting two separate power plants intended to help solve the city's power problems. One contractor has been constructing the electrical systems for the NYPA 500 MW and the Astoria Energy 500 MW power plants in Astoria, Queens.


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Simplifying the Process

Virtual private LAN service (VPLS) connects local area networks (LANs) over the Internet and makes each private LAN act like a single Ethernet LAN. This is a seamless way to keep remote and branch locations connected-something practical in today's global marketplace.


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Designing for Building Integration

Interest in integrated building systems (IBS) is stronger than ever. These systems not only improve the overall performance of a facility, but the performance of the workers as well.


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Measuring Up

Imagine what would happen if you were working on a construction project and had to make a measurement. You used your tape measure and got a length based on the markings on the tape. A member of your crew showed up with a laser ranger and made his measurement.


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In the Zone

It is not a new cabling and wiring installation technique, but it has certainly come of age. Zone cabling is a little like the old multiplexed circuits of the early high-end burglar alarm systems (think New York jewelry stores) with a much more modern twist.


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Producing Effective Terminations

Some years back, fiber optic connector manufacturers started offering connectors that terminated fiber quickly without using adhesives or requiring polishing. The manufacturer glued a short stub fiber into the connector ferrule and polished it perfectly in the factory.


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