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 NEC that relax the grounding rules for equipment. These alternatives include isolation, insulation, or guarding as methods of providing equal and effective safety measures without grounding the metal parts or equipment. [...]
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Series combination ratings are utilized to attempt to save money on some jobs. This article presents a simple checklist that can be completed by the contractor and/or designer when series rated combinations are proposed. The checklist is designed to be a single sheet that is double sided. The front side requires information for a specific [...]
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By the early 1990s, the industry was rolling out another approach to smart homes. The technology had many names at first, but today the industry has settled on the name structured wiring. However, the standards bodies have recently given the technology the designation of structured cabling. This new cabling system was initially developed by manufacturers [...]
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It is commonly known that conventional transformers and neutral conductors can become overloaded and hot due to harmonics generated by computer equipment and other non-linear loads. Triplen current harmonics (mainly 3rd and 9th) sum arithmetically in the neutral and circulate in the primary windings of transformers. A simple and effective solution being commonly applied is [...]
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NFPA 79, the Electrical Standard for Industrial Machinery 2002 edition, is scheduled to be published in October 2002. During this past cycle, NFPA 79 has undergone a major overhaul in an effort to harmonize requirements with those of IEC 60204. This, as you can imagine, was a major undertaking and resulted in a heavy workload. [...]
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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 protection for electrical equipment. NEC 210-12 requires arc-fault circuit protection in bedrooms but many of us still do not fully understand AFCI function. Arc-fault circuit breakers have been developed to detect [...]
(No Ratings Yet)The new 19th edition of the Canadian Electrical Code has brought about some changes in the grounding and bonding rules. Not many of these are major changes. In a few instances, a change might simply be the re-arrangement of some words or the relocation of rules to more logical places in the code. In this [...]
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I have written several times in the IAEI News about the hazards associated with substations and some of the easy ways to understand NESC requirements for substations. In my November/December 1997 article titled “A Substation is Not Just a Fence,” I discussed the fallacy of using a fence as a quick and inexpensive fix to [...]
(1 votes, average: 5.00 out of 5)Question: Dry type transformer Are dry type transformers with expanded metal bottoms suitable for installation on combustible floors?
(No Ratings Yet)Question: Incandescent recessed luminaire Are all incandescent recessed luminaires (fixtures) Listed for installation in a sloped ceiling?
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IAEI, as the keystone of the electrical industry, is a membership driven, non-profit association promoting electrical safety throughout the industry by providing premier education, certification of inspectors, advocacy, partnerships and expert leadership in Electrical Codes and Standards development.
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