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. 

In the past year, fiber optics underwent some important developments, some technical and some market-related. For those of you working in fiber optic network design and installation, the changes present opportunities and challenges.


This article is the first in a series that provides a step-by-step approach for performing arc flash calculations.
 Arc flash studies and software


I often give my power quality (PQ) 101 course to new engineers or salespeople. This introduction starts with the basics: an overview of PQ phenomena based on IEEE 1159 Table 4.2 followed by Ohm’s and Kirchhoff’s laws and how they apply to power quality.

We strive to protect building occupants, including our employees. Many years ago, the Occupational Safety and Health Administration (OSHA) formed to codify regulations in the area of employee protection.


More on Systems

 
Number of Conductors in an Outlet Box, Connecting Ground Rods and More

CODE CITATIONS Article 250 Grounding Article 314 Outlet, Device, Pull and Junction Boxes; Conduit Bodies, Fittings and Manholes Article 430 Motors, Motor Circuits and Controllers Article 440 Air Conditioning and Refrigerating Equipment Article 517 Healthcare Facilities Article 695 Fire Pumps Overcur


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Private Security

VPNs offer privacy over a public backbone From a systems standpoint, security always seems to make its way to the top of any task list.


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The Trouble with Mismatched Fibers

Careful documentation can help Gone are the days when all fiber optic cables were the same. Most building cables had 62.5/125 micron multimode fibers for LANs or security systems, while outside plant cables were all single-mode fiber.


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Make Data More Productive

Improving the information flow Real-time data is a hot commodity in technology-for-business circles right now. The interest is mostly coming from big companies, but that doesn’t mean it’s not for you. Real-time data is useful to even the smallest contractor with employees.


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Detecting a Trend in the Residential Market

More homeowners want CO detectors installed Smoke detection in the home has saved numerous lives and is now a normal part of every electrical contractor’s commercial installation package.


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All Bundled Up

It can keep you warm—or create a fire hazard “BUNDLE (bundled, bundling):To occupy the same bed without undressing, said of a man and woman, especially during courtship.” —Webster’s Dictionary.


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MooreAiis Law is Calling

Physical security and information technology team up Moore’s Law basically states that computer technology doubles in ability every 18 months or so, but why should that be a surprise?


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