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January 20, 2012

Seminar: Electrical Distribution Equipment Spec Writing; & Short Circuit, Coordination and Arc Flash Analysis

by @ 8:52 am. Filed under ALL, Electrical/Power

FRIDAY March 23, 2012
SF Industry Applications Chapter
Instructors: Chris Lovin, Eaton Cutler Hammer; Gary Fox, General Electric; Jim Avery, IEM; Finn Schenck, Schneider Electric; Glyn Lewis, P.E., Applied Power
Time: Registration at 8:00 PM; class from 8:30 AM – 4:40 PM
Cost: $250
Place: Hilton Hotel, 7050 Johnson Dr., Pleasanton
RSVP: Through EventBrite, at

Morning session (with Lovin, Fox, Avery, Schenck): We design electrical distribution equipment to perform increasingly complex tasks.? While the fundamental purpose of electrical distribution equipment is to safely distribute electrical power, customers require all levels of distribution equipment to perform increasingly complex switching, data acquisition, and automation tasks.? As a result, we combine specifications in order to meet project needs.? Unfortunately, doing so often provides conflicts in the specifications â?? leading to exceptions and clarifications that may not meet the engineerâ??s design intent.? The presentation will focus on how to specify equipment that manufacturers can build, while adding the features that customers need.
We will review specifications for Medium Voltage switchgear and transformers, as well as low voltage switchgear & switchboards, LV transformers, and Panels.? The purpose of this presentation is to provide the designer and engineer with an overview of how equipment interacts, how to specify features that the manufactures can actually provide, and understand how specifications can influence project cost and lead time.? Suppliers are responsible for building safe, reliable equipment that applies to industry standards, while meeting the project requirements.? Specifications should define required features, ratings, and performance needs, but since the equipment is manufactured per various Labels and Standards, many features are not available for modification.? Specifications often attempt to define â??how to build??? a product, or add features that are in conflict with the standards under which the equipment is designed, manufactured, and tested.? ? ? Additionally, specifications often combine proprietary features from multiple manufacturers.? Finally specifications should not conflict with the drawings.? Proposals often arrive with pages of clarifications that can cause significant issues for the project.? Following this presentation, the attendee will understand how to write a clear, concise specification that will communicate project design needs, without adding requirements that lead to unnecessary clarifications, exceptions, added cost, and delays.

Afternoon Session (with Glyn Lewis): The production of short circuit and coordination studies is now more of a science than an art, as in years gone by. The new science is the plethora of computer programs now available at comparatively low cost. These programs are produced by people who have rigorously studied the multitude of standards and incorporated their methodology into their programs. However, the longstanding problem of interpretation still exists and requires further knowledge of the hardware devices and their application standards. This afternoon presentation provides some guidelines in the analysis of the computed and graphical results of the studyâ??s results. Emphasis will be placed upon selective tripping and implementation of arc flash safety programs.

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