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. 

Plug loads, according to a pilot study performed by New York-based green technology company ThinkEco Inc., make up the fastest growing end-use of electricity in the commercial sector. As the amount of electricity used by plug loads grows, it becomes increasingly important to manage it.

In attempting to explain to a colleague why we care about negative sequence components, I tried to follow the guidance that Bob Lawrie, another member of the NFPA 70B Electrical Equipment Maintenance committee, offered to me many years ago: never use a formula in an article.

Another year has passed, and we have nothing revolutionary to report about fiber optic technology—no instant-on connectors, dirt-cheap lasers or simple solutions to installation problems.

When a potential client calls on you to provide a fire alarm system, do you assume the design responsibility? If so, what resources do you use?


More on Systems

 
Installing Fire-Alarm Systems, Part II
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Last month, in part one of this article, we said the National Electrical Code (NEC) and the “National Fire Alarm Code” from the National Fire Protection Association (NFPA) were two of the most important resources needed to properly install a fire-alarm system.

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Market Convergence Means Opportunity
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While the general market outlook for unshielded twisted-pair (UTP) and coax cable is flat, certain segments will jump this year. “Overall market growth will be in the lower single-digit area,” said Bill Miller, director of marketing for Belden Electronics Division.

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Home Theater: Broadening Your View
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You’re familiar with the concept of the “smart house,” which is in the third generation of development. Their computerized electrical systems open garage doors, program lighting schemes and operate home-security systems. Some even turn on the coffee pot.

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Home Automation Gains Momentum
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From personal home theaters complete with surround-sound speakers, high-definition, large-screen projection and DVD recordings to total-system lighting packages, electrical contractors are profiting from rapid technological advances.

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MACs: A 'Contractor Paradise'
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When it comes to moves, adds and changes, most customers can’t or won’t do what it takes to cut costs. As a result, many VDV contractors are surviving tough times thanks primarily to MACs work.

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Aluminum Wire Terminations, Oversize Distribution Panels and More
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CODE CITATIONS Article 110 Requirements for Electrical Installations Article 215 Feeders Article 220 Branch Circuit, Feeder and Service Calculations Article 250 Grounding Article 400 Flexible Cords and Cables Article 404 Switches Article 430 Motors, Motor Circuits and Controllers Aluminum wire termi

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Article 210 - Branch Circuits: Required Receptacle Outlets, Part X
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210.52(H) Hallways Article 210 covers branch circuits except for those supplying only motor loads. Motor-load requirements are covered in Article 430. Receptacle-placement provisions are stipulated in 210.52(A) through (H).

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