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. 

Design/build means different things to different people. Regardless, you should know that it places more responsibility on your shoulders as the electrical professional. It means you need to stay abreast of the codes that affect your installations.


Figure 1: Typical magnitude of voltage sag as percent of nominal compiled of EPRI DPQ Project in 1990s

A customer recently called me about the information on his power quality monitor screen. He said about a dozen different events were showing up, but the lights had just blinked once. He wanted to know what all of the other nonsense was supposed to tell him.

Last month, I wrote about how fiber was being used to expand bandwidth for cellular systems, connecting cell towers to the phone network and antennas on the tower to the base electronics. That helps our phone coverage when we’re driving or walking outside.

Workflow-management tools are designed to orchestrate everyday business processes. For example, a contractor may implement a process for submitting, reviewing and approving expense reports.

More on Systems

 
Take Care in Installation
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There’s strength in members Many electricians have their first encounters with fiber optic cabling when asked to install the cable for others who terminate and test it.

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STP vs. UTP
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Money usually decides this debate One of the great debates that affects contractors—especially those dealing with communications systems—may be the question of shielded twisted pair (STP) or unshielded twisted pair (UTP).

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Cameras in the Classroom
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School security is changing as fast as it is growing, and electrical contractors who don’t educate themselves in the latest digital video recording and imaging equipment stand likely to lose out on a lucrative market.

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Data Center Design Recommendations
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Think ‘tiers’ for a standards-compliant data center It seems as if a big chunk of future contracting work will come from designing, installing and supporting data centers. There are many reasons this is being headlined in the telecommunication trades: it’s a solution to many problems.

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Lloyd Electric Connects the Nation's Airports
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When Boeing Integrated Defense Systems was awarded the mammoth project of providing all the nation’s airports with baggage explosives screening equipment by the end of 2002, it sought partners in small and minority enterprises.

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Nonmetallic Conduit for Essential Hospital Systems
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The five exceptions to providing nonflexible metal raceways Providing alternate power for essential electrical circuits in a hospital is extremely important during loss of normal power.

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A Misleading Circuit
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Can a 20A receptacle be placed on a 15A circuit?

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