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. 

Brady BMP21-Plus label printer

Making labels on the job site can be a time-consuming task for integrated systems contractors, but it can pay big dividends in the long run.


In the last issue, I wrote about the practice of splicing two fibers with a fusion-­splicing machine. This month, I discuss some secrets that experienced splicers have learned—often the hard way.


Figure 1: Notching caused by semiconductor-controlled rectifier switching during commutation period

Maybe it is because they are rarely seen by the human eye or because the proliferation of surge protector strips makes everyone feel immune, but transients still exist and can wreak havoc with electrical equipment.

With cities and utilities worldwide upgrading to light-emitting diode (LED) lighting for streets and outdoor areas, owners and installers wonder when they 
will build in the controls for smart-city applications.

More on Systems

 
Training Day: Comtel Systems


Comtel Systems, Sunnyvale, Calif., has been in business since 1982. It employs about 100 people and does virtually all types of low-voltage work. Comtel tends to specialize in physical security (access control, data surveillance, alarms), nurse call and public address.


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30 Years Later: Are fire alarms systems easier to install today?

Thirty years ago, fire alarm equipment contained relays only in the fire alarm control units. The most information you could obtain from a fire alarm system was the device actuation zone.


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Bosch L-Boxx insert tray
Cool Tools: Portable Containers

At one time, a toolbox was just a metal box. Then, plastic and composite materials came along. Whatever the material, it remained a box, perhaps with a pull-out tray to hold smaller items. But what about portable containers for accessories and supplies?


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We Need More Fiber

Recent columns have focused on what is happening with dark fiber, that which is being “lit” to become the backbone of the world’s communications systems. Dark fiber connects data centers, cell towers, cities, towns, governments and people.


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A New Frontier Of Sales

Are electrical contractors getting what they need online from their distributors? The answer, as it happens so often, depends on whom you ask.



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Figure 1: Phase current and demand plots for July 22–Aug. 3
25 Cents A Blink

The electrical energy usage in most industrial and commercial facilities follows a reasonably consistent pattern from week to week, so a one-week monitoring program usually is adequate to determine what can be done to save 10–20 percent on electric bills.


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Normal Wear And Tear

In the course of daily business, you often receive a request to update or replace electrical systems in a building. Have you ever proactively asked customers to allow you to review and audit their fire alarm systems?



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