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. 

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. 


Figure 1: Special manual building evacuation station. Photo courtesy of Jensen Hughes Inc.

Recently, a number of inquiries were made to our office regarding the topic of delaying or preventing the activation of fire alarm notification appliances.

As data about home energy use expands, the next big thing could come from new products and services companies create to analyze and use that data.

More on Systems

 
Composite Cables

Immunity to EMI makes copper-fiber cable attractive We marveled at photos of the Titanic taken by the team headed by Dr. Robert Ballard, who located the shipwreck in 1986. But how many of us realized the photos were made possible by a special type of fiber optic cable?


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One-Third of U.S. Households Broadband Enabled

ROUGHLY ONE-THIRD of U.S. households now subscribe to some type of broadband service, reports In-Stat, a Scottsdale, Ariz.-based market research firm. As broadband becomes more commonplace, Internet use is evolving with broader adoption of a variety of applications.


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NEMA Releases 2006 Motors and Generators Standard

The National Electrical Manufacturers Association (NEMA) has published MG 1-2006, Motors and Generators.


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U.S. Breaks All-Time Weekly Demand Record for Electricity During Heat Wave

THE U.S. DEMAND for electricity reached an all-time record in late July, during a punishing national heat wave. U.S.


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NFPA Amends Codes, Includes Electronic Monitoring of Fire Extinguishers

The National Fire Protection Association (NFPA) voted to amend NFPA 10 and NFPA 72 to include electronic monitoring in lieu of mandatory physical 30-day inspections. The ruling went into effect at the beginning of September.


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Sticking Together

The majority of Fiber optic connectors are still installed in a process that uses an adhesive to attach the connector to the fiber and polishing to finish the end surface of the connector.


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Energy-Saving Performance Contracts

As energy costs continue to escalate, cash-strapped government agencies are looking for ways to update their old electrical systems. The problem, however, is that many are unable to pay for upgrades.


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