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

 
Ground-Fault Protection Systems for Services

Ground-fault sensing and relaying equipment is intended for use in power distribution systems rated at 600V maximum and are considered to be equipment protection devices, not personal protection devices.


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The Return of Radio

Wireless in 2004 and beyond is defined by innovative applications Wireless has gone beyond the realm of simple remote control. Now, wireless is always a part of the majority of the systems, services and products we use.


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Face-to-face Communication

Videoconferencing allows visual contact without travel Who could have predicted that one day we could all instantly communicate no matter where we were, no matter what we were doing?


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Understanding OTDRs

They can be useful—but only if used correctly There are two distinctly different fiber optic applications: premises cabling and outside plant (OSP) cabling. Premises cabling deals primarily with short multimode cables in buildings or between buildings in a campus.


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Redundant Grounding in Patient Care Areas
by Staff |

Redundantly grounding all electrical equipment in a patient care area has provided one of the most critical pieces of a very complex puzzle involving patient protection.


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The Proliferation of Wireless Networking

Wireless networking is a growing segment of the voice/data/video (VDV) market offering a great deal of opportunity for the electrical contracting firm.


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Abandoned Fire Alarm Cables, Conductor Derating and More

CODE CITATIONS Article 90 Introduction; Article 110 Requirements for Electrical Installations; Article 210 Branch Circuits; Article 220 Branch-Circuit, Feeder and Service Calculations; Article 250 Grounding; Article 300 Wiring Methods; Article 310 Conductors for General Wiring; Article 400 Flexible


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