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Wednesday, August 16, 2017

Monthly Archives: September 2002

Supplementary Grounding Electrodes

Electrical systems and non-current-carrying metal parts of equipment in an electrical installation generally are required to be grounded; however, alternatives are given within the...

Series Combination Rating Requirements

Series combination ratings are utilized to attempt to save money on some jobs. This article presents a simple checklist that can be completed by...

Structured Cabling: An Essential Utility for the 21st Century

By the early 1990s, the industry was rolling out another approach to smart homes. The technology had many names at first, but today the...

3rd Harmonic Blocking Filter: Is the Cure Worse Than the Disease?

It is commonly known that conventional transformers and neutral conductors can become overloaded and hot due to harmonics generated by computer equipment and other...

Update on NFPA 79, 2002

NFPA 79, the Electrical Standard for Industrial Machinery 2002 edition, is scheduled to be published in October 2002. During this past cycle, NFPA 79...

AFCI Troubleshooting

Although not required by UL Standard 1699, all of the listed branch/feeder arc-fault circuit breakers currently available also provide a certain degree of ground-fault...

Canadian Electrical Code Revisions: Grounding and Bonding Requirements

The new 19th edition of the Canadian Electrical Code has brought about some changes in the grounding and bonding rules. Not many of these...

NESC Substation Grounding

I have written several times in theIAEI Newsabout the hazards associated with substations and some of the easy ways to understand NESC requirements for...

Are dry type transformers with expanded metal bottoms suitable for installation on combustible floors?

Question: Dry type transformer Are dry type transformers with expanded metal bottoms suitable for installation on combustible floors? Answer Dry type transformers with expanded metal bottoms are...

“Yesterday things were different…Today, they are different again.”

The opening line from a southern gospel music song by the Cathedrals has special meaning for me at this point of my life. Yesterday,...
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