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Thursday, October 27
PQT 13
Wiring & Grounding
2:45 pm-4:45 pm
There is nothing more confusing, misunderstood and misapplied then grounding and the associated building wiring. All these efforts are intended to helping sensitive electronic equipment.
The NEC requirements combined with additional proven practices may or may not help specific situations. Depending of the nature of the load, the environmental concerns and safety issues, wiring and grounding implementation will vary.
The session will attempt to answer design and provide guidance for troubleshooting such cases. We predict this to be a highly interactive session. We look forward to our audience to share their opinions and practices with our speakers.
Paper Presentations
The Missing Link in Power Quality Measurement: The Ground on the Load Side of The Revenue Meter
Brian Blanchette, Ideal Inustries
This paper will examine the importance of the ground conductor to power quality measurement, especially in the area of data and voice communication. A comparison of ground for safety and code implications will be included. Simple and unique methods for test will be demonstrated. Actual case studies will be cited, and a method for testing and verifying grounds and bonds will be demonstrated.
Leakage and Ground Currents: Measurement Techniques
Judith Russell, PowerLines
Ground and/or leakage currents can create numerous problems, including electrical noise, magentic fields, patient safety concerns, spurious GFI/GFCI tripping, etc. Measuring and quantifying such currents can prove challenging. Using real world examples, this paper covers the basics of leakage and ground current, the problems posed by such currents, and presents some basic measurement and troubleshooting techniques using appropriate measurement tools.
Wiring and Grounding for Power Quality
David Brender, Copper Development Association, Inc.
The proliferation of computers and other sensitive devices throughout our manufacturing and office environment has fostered the need to design the electrical systems of buildings with an eye toward power quality issues. In fact, 80% of power quality problems originate tight within the building suffering from the poor quality. Grounding and wiring practices have been identified and the primary culprits.
The primary focus of this presentation is to recommend wiring and grounding techniques and practices that should be part of the design of new or renovated structures. These practices will help prevent power quality problems from occurring in the first place, or diminish their effect to the point where they are not significant.
We will discuss:
- The cause of power quality problems
- The limitations of the National Electrical Code
- Definition and description of harmonics and how they add in the neutral grounding; what’s require and what’s desired, ground resistance, ground loops
- General wiring practice, separating sensitive loads
- System reliability
- Isolated ground
- Transient and lighting protection
- Recommended practices of IEEE 1100
Several case studies will amply illustrate application of proper electrical infrastructure in the elimination and prevention of power quality problems, and the results others have achieved. The presentation is completely generic in nature, and no branded products are promoted or recommended.
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Tuesday, October 14, 2008
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