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. 

Evolution in action


Much has been said and written about analog video cameras and the move to internet protocol (IP) networked digital surveillance. Some predicted the demise of analog and takeover by IP devices would progress quickly, but clearly that hasn’t happened.

A while back, I wrote about a house with 14 kilowatts (kW) of solar panels installed on the southern exposure roof. Voltage and current monitoring at the breaker panel prior to the solar panel installation had shown 10–12-volt (V) deep sags occurring as frequently as every 22 minutes.

A June 2016 report, "Market Data: IoT for Residential Energy Customers," published by Navigant Research, examines the global market for devices and services that are considered to be part of the residential "Internet of Things" (IoT), including forecasts for shipments, installed base, average sellin

United States’ military strategists have talked about the threat of an electromagnetic pulse (EMP) strike since the Cold War in the 1950s, 1960s and 1970s.

More on Systems

 
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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Detecting a Trend in the Residential Market

More homeowners want CO detectors installed Smoke detection in the home has saved numerous lives and is now a normal part of every electrical contractor’s commercial installation package.


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Analog Addressable Fire Alarm Systems

Is high-tech better? Fire alarm system technology seems to be developing faster each day. It wasn’t that many years ago when an electrician treated a fire alarm system just like any other electrical system he or she had to install.


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Choosing the Right System

Choices include surveillance, access control and location Safety and security systems for any healthcare facility are complex. There are so many “systems” available that it is quite daunting to decide which ones are worth the investment.


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Article 220-Branch Circuit, Feeder and Service Calculations

Cooking Equipment Calculations, Part IV 220.19 Electric Ranges and Other Cooking Appliances


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