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. 

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.

Six years ago, with no experience as an internet service provider (ISP) or telecom service provider, Google Fiber generated an immense amount of excitement by announcing that the company was going to build a gigabit-speed fiber-to-the-home (FTTH) network for Kansas City, Mo., a city chosen from more

Access control is one of the most prevalent and longstanding methods of securing entrances, exits and areas within protected premises.

Appetite for intelligence


The simplicity and ubiquity of home automation means opportunity for ECs. For one thing, today’s systems come ready to install, and contractors can learn installations in a matter of hours rather than weeks. For many ECs, it has been a welcome transition.


More on Systems

 
Ensuring Earth Connection

In the 2002 and previous editions of the National Electrical Code, the metal frame of a building or structure was required to be used as a grounding electrode when the metal of the building or structure was effectively grounded.


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Add Sound to Your Repertoire

You've heard it before: Your customer wants structured wiring and networking, and they also want a sound system. Is it over your head? Not if you take the time to learn some simple steps to increase your business and get started in this growing area.


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Going the Distance

Just when those hungry for bandwidth thought they had struck gold with Wi-Fi, along comes something else to further the wireless revolution. WiMAX-Worldwide Interoperability for Microwave Access Forum-or WirelessMAN, is bound by the IEEE 802.16 standard.


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Wireless LAN Solutions: The explosion extends to the integrated building

FOR SECURITY, COMMUNICATIONS, CONTROLS and other information technology functions, wireless is one of the fastest-emerging growth markets. In the business environment, wireless networking has to be safe and secure because sensitive data, personnel records and other information are at stake.


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Prefabricated Components

Using prefabricated and preassembled electrical components often can bring substantial cost savings, especially on large projects such as hotels and hospitals that have a large number of identical layouts.


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AFCI Protection, Nonmetallic Conduit and More

Article 110 Requirements for Electrical Installations Article 210 Branch Circuits Article 230 Services Article 240 Overcurrent Protection Article 300 Wiring Methods Article 342 Intermediate Metal Conduit: Type IMC Article 352 Rigid Nonmetallic Conduit: Type RNC Article 408 Switchboards and Panelboar


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Bluetooth Moves Ahead

Good old Bluetooth, the hot topic in regard to personal area networks (PANs). Though it goes into a sort of technology-remission every so often, it is still out there and has a loyal following. Attention is once again being focused in its direction, but this time for different reasons.


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