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July-August 2000
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July-August 2000 CoverJuly-August 2000


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Arc-Fault Circuit Interrupters

by Clive Kimblin

The objective of this paper is to increase inspector-awareness of arc-fault circuit interrupters. The significance of AFCIs is discussed in the introduction, and this is followed by a description of recent changes associated with the standard, with the National Electrical Code, and with the availability and application of the technology. Here there is a general discussion of AFCI availability, followed by a detailed description of the Cutler-Hammer line of residential miniature circuit breakers that incorporate branch/feeder AFCIs and a brief description of the technology involved. Read more

Lab Data

by David Dini

According to the U.S. Consumer Product Safety Commission (CPSC), residential electrical equipment is involved in approximately 150,000 fires each year in the United States, which result in 850 deaths, 6,000 injuries, and more than $1.5 billion in property losses. A new technology called "arc-fault detection” has been developed to reduce this problem. Research conducted by UL has shown "arc-fault detection” to be a promising technology for further reducing the risk of fire beyond the scope of conventional fuses and circuit breakers that protect branch circuits. Using this new technology may save many lives and dramatically reduce the property damage and injuries caused each year by electrical fires. Read more

Overcurrent Protection for Air-Conditioning and Refrigeration Equipment

by Michael Johnston

Overcurrent protection for electrical equipment can be accomplished by several different methods. The general rules for overcurrent protection of conductors and equipment are found in Article 240 of the National Electric Code. Section 240-2 indicates Article 440 shall be used for protection of air-conditioning and refrigerating equipment. Read more

Arc Detection with the AFCI

by George Gregory

The arc-fault circuit interrupter (AFCI) is emerging as a new device in the National Electrical Code and in residential installations to enhance electrical safety. New technology generally fosters questions and concerns about the workings and application of the technology and this article will address some of the most frequently asked questions surrounding AFCI... Read more

Proposed Changes for the 2002 NEC

by Philip Cox

Over 4700 proposals were submitted to the National Fire Protection Association to amend the 1999 National Electrical Code. The 20 NEC Code-Making Panels met in January 2000, and took action on proposed changes to articles of the Code within the scope of each respective panel. Listed below is the first of a two-part brief summary of some significant changes accepted by the panels. The second part of the summary will be in the September/October issue. A more comprehensive coverage of accepted changes will be published following final action in 2001. Read more



The IAEI and the Electrical Inspector

by Philip Cox

Some members have voiced interest in expanding the scope of associate members of the IAEI in order to give those members a greater role in the operation of the organization. It is felt by some that because the majority of the members are classified as associate members and many of them work very hard for the organization, they should have the right to hold any office, vote on all matters, and represent the IAEI on committees involving other organizations. Read more

Canadian Code

Delta-Wye Conversions

by Leslie Stoch

What should happen when the electrical utility or a utility customer decides to convert the ungrounded 600 volt, 3-wire supply to a 600/347 volt, 4-wire, solidly grounded electrical supply? Some commercial and industrial businesses still prefer to use an ungrounded 600 volt supply for service continuity reasons, or to avoid the costs of converting to a grounded 4-wire supply. Read more

UL Question Corner

Five New Categories for AFCI Devices Under UL 1699

by Underwriters Laboratories

In the March-April issue of IAEI News’ "UL Question Corner,” UL indicated that arc-fault circuit interrupters (AFCIs) were covered under the product category of Circuit Breakers, Molded Case, Classified for Mitigating the Effects of Arcing Faults (DIWL). Since then, the UL engineers responsible for AFCIs have pointed out that this category has been phased out and replaced by five new categories specifically for AFCI devices, now covered under UL 1699, Standard for Arc-Fault Circuit Interrupters. Read more

Other Code

Just Don’t Bump Your Head On It

by David Young

When we talk about mini- mum ground clearances of span conductors, we have to know the sag of the conductor because the minimum height of attachment on a structure to comply with the National Electrical Safety Code® (NESC®) is the minimum clearance plus the maximum sag of the conductor. The ground clearance for equipment cases and rigid live parts is very simple and yet often ignored. Too often someone says, "Mount it high enough so someone doesn’t bump his head on it.” This design "philosophy” is a gross violation of Rule 232B2 & 3 (page 72) of the 1997 NESC. Read more

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May-June 2000March-April 2000January-February 2000November-December 1999September-October 1999

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