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May-June 2009
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TABLE OF CONTENTS

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Features

GFCIs and Swimming Pools – A Natural Fit

by Keith Lofland

Most of us have seen or read something about the figure commonly known as the fire triangle (oxygen, heat, and fuel), which is a working model to illustrate and to help one understand the ingredients necessary for most fires. There is another odd triangle that contributes to most electrocutions associated with the swimming pool environment. Read more

Perspectives on PV

* Approaching the Inverter

by John Wiles

In our top-to-bottom perspective of a photovoltaic (PV) system, we are still on the dc circuits from the PV array and are approaching the inverter. There are always a few details that get overlooked in designing, installing and inspecting these systems. Read more

Pools, Tubs, and Spas – Section 68

by Steve Douglas

Between the 2006 Canadian Electrical Code and the new 2009 edition in Section 68 we have six rule changes, one Appendix B change, and one Table change. The intent of this article is to detail these changes along with rationale for the changes. Read more

Achieving Fire Protection of Electrical Life Safety Circuits

by Barry O'Connell

Wonderful though electricity was in its early days as a miraculous source of light and power, installations did seem to have a habit of catching fire rather too often. In 1896, a young Swiss professor, François Borel, who was researching ways of improving cables, filed a patent for an all-mineral-insulated fire-resistant cable. Read more

The Challenge of Increasing Electrical Safety, Part 3

by Jim Pauley

The common thread throughout the first two articles in this series has been the need for electrical inspectors to be armed with the facts to counter challenges to electrical safety. Knowing the facts better enables inspectors to perform high-quality inspections that benefit the installer or electrical contractor, end users and the local jurisdiction. Read more

In the Dark about Green Lighting?

by Gersil N. Kay

With the eventual depletion of natural resources and the uncertain international situation, there is an increasing worldwide need for green, sustainable, energy efficient, stylish and affordable mechanical/electrical systems. Of the three disciplines now regulated by the national ASHRAE / IESNA / ANSI1 Standard 90.1... Read more

Transfer Equipment Used in Optional Standby Systems for Commercial Applications, Part I

by Chad Kennedy

Significant growth in optional standby systems for commercial applications is being driven by the demand for electrical power to be present that will ensure continuity of business activities. Concerns stem from weather related outages to other reliability issues that can result in the loss of electric utility of a building, communication center, or process. Read more


Occupational Electrical Injury and Fatality Trends and Statistics: 1992–2007

by Brent C. Brenner

Next year we will commemorate the fortieth anniversary of the U.S. Department of Labor Occupational Safety and Health Administration (OSHA). Since its creation, overall workplace fatalities have been cut by more than 60 percent and occupational injury and illness rates have declined by 40 percent. Read more

Departments

Editorial

Are You Indispensable?

by James W. Carpenter

In the March/April issue of the IAEI News, I was wondering what our administrators were thinking about when they were downsizing or, in some cases, eliminating the inspection services that provide for the safety and welfare of their constituency. This time, I am wondering what we can do as inspectors, installers, designers, manufacturers, etc., to make ourselves so important that the administrators look somewhere else for budget cuts. Read more

Canadian Code

Rule 36-110, Tables 33 and 34

by Leslie Stoch

Rule 36-110 refers us to Canadian Electrical Code Table 33, Horizontal Clearances from Adjacent Structures, and to Table 34, Vertical Clearances for Overhead Lines, to provide minimum safety clearances for installations operating in excess of 750 volts. Table 33 provides minimum horizontal clearances between high voltage conductors and buildings. Read more

Canadian Perspectives

Rating of Transformer Circuits

by Ark Tsisserev

There are some subjects in the Canadian Electrical Code that often become a source of heated discussions by the users. Selection of dry type transformers and selection of a proper rating of the transformers’ circuits is one of such controversial subjects. So, let’s try to clarify this seemingly complex issue. Read more

UL Question Corner

Luminaire disconnects and motors?

by Underwriters Laboratories

Are the luminaire disconnect connectors that are used to comply with NEC 410.130(G) evaluated for other uses such as a disconnecting means for a motor? Read more

UL Question Corner

How do I use the UL White Book?

by Underwriters Laboratories

I received a UL White Book at an IAEI meeting. It seems to contain a wealth of information for electricians and electrical inspectors; however, I do not know how to use it. Does UL have an online presentation that can show me how to use the UL White Book? Read more

UL Question Corner

Grounding permanently mounted portable luminaires

by Underwriters Laboratories

Are permanently mounted portable luminaires required to be grounded? I have seen some wall-mounted portable luminaires that are cord connected with a polarized plug, even though these products often have quite a bit of exposed metal. Read more


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