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. 

If you’re going to do a job right, you need the right tools. Today, the definition of tool goes beyond wire crimpers and multimeters. It now includes smartphones and the apps that make them crucial to a contractor’s success. The following are some of the apps that contractors could consider using.


Last month, we looked into positive, negative and zero-sequence components, also known as symmetrical components, with virtually no math involved.

It is a sign of tight budgets when facility directors at most K–12 and higher education institutions receive mandates to defer maintenance on their existing building inventory to allow for budget dollar application elsewhere.

“Dark fiber” is a term often heard in conversations about fiber optic communications. Perhaps this is because it has a name that sounds evil or nefarious. But dark fiber is just fiber that has been installed and is not currently in use; instead, it is reserved for spares or future use.


More on Systems

 
Alternative Power Source Generation
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Advances in small-scale generation technology coupled with growing environmental concerns, a changing energy market, evolving public policy and customer need for reliable and economical electric power supplies will provide a new growth market for electrical contractors.

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Enhanced Web Applications
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The Internet is as popular as ever. It seems you can’t turn around without bumping into something Web related. But the Internet has evolved; there is more to it than surfing for sports scores and celebrity gossip.

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Design and Documentation
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What is documentation and why is it important? We hear about “documenting” a network, but we don’t often listen. It seems like too much work for too little or no payback. But that way of thinking is wrong.

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The Lowdown on Camera Lens Advances
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Variety and innovation mean installation flexibility when it comes to lenses for closed-circuit television surveillance (CCTV). That’s just what the end-user needs: a camera and lens that can satisfy whatever the surveillance application dictates.

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Cities Unto Themselves
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Hospitality and gaming facilities, with their large crowds often sharing one property, need quick and reliable fire detection systems with the ability to pinpoint the area in alarm to allow selective and orderly evacuation.

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Conductors Connected in Parallel
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Parallel conductors are often installed where large ampacity feeders or services are used. Total understanding of the paralleling requirements permitted in the National Electrical Code is necessary before attempting to design a large electrical system or install these conductors.

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When Do You Need OTDRs?
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In outside plant fiber optic installations, every cable installed will be tested for end-to-end loss with a source and power meter and an OTDR trace will be taken of each fiber. Yet OTDRs—optical time domain reflectometers—are rarely used in premises applications. Why is that?

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