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. 

Industrial firms and contractors stand to benefit from emerging innovations in remote-monitoring technology.

When people send in data from a power quality monitor to be reviewed, some common questions include “Is my site normal?” and “Does this data look OK to operate my facility?” Such questions usually get the same ambiguous answer: “It depends.” The quality of electric power as supplied and how much is

When it comes to systems integration, intrusion detectors and sensors are the ties that bind.

As I have described in the previous few columns, splicing fibers is fairly easy. If the installer cleans and cleaves the fibers properly, the machine does the rest. However, the installer’s job is not over at that point.


More on Systems

 
An Emerging Trend

I see a trend in news headlines reporting the reduction of city budgets and personnel. Fire departments have especially become resource-challenged. However, the city officials still urge the fire department management to do more with less.


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Figure 1: Distorted current waveforms from six-pulse converters
Imperfect Harmony

The basic principles of harmonics have been the same since 1822, when Joseph Fourier first proposed that some functions could be composed of an infinite sum of harmonics.


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Creating A Commodity

Selecting an Internet protocol (IP) camera can be mind-boggling. Do you need 4K, one of the highest resolutions available? What about storage? Does the camera save with the super-efficient H.264 compression algorithm, or can you store on SD memory cards?



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Dressed in Overalls

In my everyday work with contractors installing fire alarm systems, I do not find many people who can honestly say they have read NFPA 72 2013, National Fire Alarm and Signaling Code, at least once.


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Greenlee's fusion splicer and cleaver kit
Cool Tools: Fiber Tool Kits

The days of predominately copper structured wiring are long past. Technicians are installing a growing amount of fiber optic cable in surveillance, alarm and control systems.


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A Sprinkle Of This, A Dab Of That

Low Voltage Contractors, Minneapolis, opened its doors in 1982 and specialized in design/build low-voltage work from the start. It focused on fire alarm installations.



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Time To Adjust

In June 2015, NFPA members met to hear arguments on motions to change the technical committee actions on a number of codes and standards, including the 2016 NFPA 72, National Fire Alarm and Signaling Code.


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