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November-December 2003
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Neon Secondary Circuits Over 1000

by Michael Johnston

Neon lighting requires ignition of gas in processed tubing with higher voltages. Voltages in the required ranges are developed by transformation from a primary (low voltage) circuit input to a secondary (high voltage) output. The voltages are produced by appropriate neon transformers or power supplies. The supply chosen is directly related to three key factors, which include the size of tubing used, the type of gas contained within the processed tubing, and finally the length of tubing. The amount of tubing also has an impact on the number of transformers required for the installation. Placement of the transformer(s) or power supply can also determine the length of secondary (high voltage) circuit that must be installed from the supply to the neon tubing. Read more

Three Chiefs Come Full Circle on Parallel Paths and End on a Tangent

by George Anchales

Prior to the 1999 edition of the National Electrical Code, Section 250-24(a), Two or More Buildings or Structures Supplied from a Common Service, basically required a feeder from the first building to be treated as service-entrance conductors at the second building. The neutral conductor was required to be bonded to the building disconnect enclosure and grounded to a grounding electrode no matter what type of wiring method was used. Read more

Arc-fault Circuit Interrupters – A Critical NEC 2005 Issue

by Brendan Foley

During 2003, many AFCI articles and comments have appeared in IAEI News. This publication activity is associated with the actions taken by code-making panel 2 on the more than 60 proposals received relative to Section 210.12 of the NEC. In particular, CMP-2 has proposed a revision that would require protection by a combination AFCI. This would effectively obsolete the field-proven branch/feeder AFCI and replace it with a combination AFCI that is not even commercially available. The present paper expands on an Eaton Electrical comment in the IAEI News, September/October, AFCI Forum. Read more

Staying Ahead of the Curve

by Steve Campolo

These are challenging times for the electrical inspection community, safety organizations such as Underwriters Laboratories, the Consumer Product Safety Commission, and electrical device manufacturers. As proof, just look at the electrical infrastructure inside today’s homes. Read more

Grounding of Alternate Power

by Rene Castenschiold

When engine generator sets are used as an alternate source of power (i.e., emergency or standby power), it is essential that they be properly grounded and that associated transfer switches be properly selected. This is necessary to assure safety of personnel, protection of equipment, reliable ground-fault sensing and continuity of power to electrical loads. Read more

Navigating the Ground Rod Electrode Maze

by David C. Prior

There is a lot of confusion on the use and application of galvanized ground rods due largely to the fact that there has not been a comprehensive specification document from which to manufacture or inspect this product for minimum Code compliance. For years a hot-dip galvanized ground rod electrode has met either the ANSI C135.30 specification, or, more often, no specification at all. Read more



IO President’s Farewell Address

by Ray Weber

For those of you that were not able to attend the 75th Diamond IAEI Jubilee meeting in Orlando, Florida, I wish to report that it was an exciting and educational event that many will be talking about for some time. Our CEO/Executive Director Jim Carpenter and his staff worked many long hours and faithfully captured what our organization is all about; that being of service to you the membership and our association. Read more

Canadian Code

Reduced Size Taps Rule 14-100, Reduced Wiring Ampacities

by Leslie Stoch

This article will discuss Rule 14-100, which specifies the minimum requirements for reductions in wire sizes. Splitter box connections are among the most common applications of Rule 14-100, where conductor sizes are reduced to current ratings below the fuse or circuit-breaker settings protecting the larger conductors. Read more

UL Question Corner

What UL Standard is used to evaluate portable power distribution units used at construction sites

by Underwriters Laboratories

Portable power distribution units used at construction sites are evaluated for compliance with UL 1640, the Standard for Safety for "Portable Power Distribution Units.” These products are Listed under the product category Portable Power Distribution Units and Devices (QPSH), located on page 93 of the 2003 General Information for Electrical Equipment Directory (the White Book). Read more

Other Code

Delayed Accident Investigations

by David Young

About twenty times each year, I am consulted on accidents involving our electric power delivery system. Most of them are accidents involving property damage. The following are some examples of this type of accident: a house fire that appears to be of electrical origin, a truck is damaged when hitting wires, a truck hits a anchor guy which results in two poles breaking and three spans of wire and equipment falling to the ground, appliances burning up when a high voltage line drops on to a lower voltage line. On the average about six times each year, I am asked to investigate electrical contact accidents involving injury or death. Read more

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