Article 250 of the National Electrical Code provides the minimum requirements for grounding and bonding. The title of the article was revised in the 2005 NEC development process to reflect what is actually covered by the article. In the past, it seems many viewed the word grounding as an umbrella description, and viewed the concepts [...]
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Well, not exactly. Yes, all of those things will usually keep a system uses sunlight for fuel. However, these and other weather conditions also affect how a PV system is designed and installed to comply with the requirements of the National Electrical Code. With a PV power system lifetime exceeding 40 years, Mother Nature is [...]
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Concern has been expressed in the electrical community regarding the aging of electrical systems in residential occupancies, possibly resulting in fires. A question not yet fully answered is: “Why is there a residential electrical fire problem in the United States, even though we have such a good code?” Among the potential answers may be that [...]
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Abstract There has been an increasing emphasis in recent decades to achieve international codes and standards for electrical installations and products. Although the bene-fits of unified documents and products worldwide seem obvious, the migration to such internationalization requires management that considers regional differences of elements such as: the presently installed base, practices used in construction, [...]
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Phasors It is time to bite the bullet. Before we can continue into three-phase electrical circuits and calculations, we have to have a solid understanding of voltage and current phase angles. To do this we turn to phasors. I’m not talking about Captain Kirk’s weapon of choice. I’m talking about a graphical representation of the [...]
(No Ratings Yet)What do you think when someone asks, “Have you seen a good electrical inspector?” Do you reply that you see one in the mirror every morning? What principle or obligation does an electrical inspector consider as his or her “prime directive”?
(No Ratings Yet)CEC Rule 14-100(d) permits the secondary conductors supplied by a high voltage power transformer to be protected by the transformer’s primary overcurrent protection (with no restriction in conductor length through the building). The rule requires that the wiring be mechanically protected and terminates at a single circuit-breaker or set of fuses set to protect the [...]
(No Ratings Yet)As contractors, you like to see the prices of things fall. Whenever the price of copper goes down, electrical contractors are able to bid more effectively. Whenever the price of oil goes down, it doesn’t cost as much to drive your utility trucks and vans around from project to project. If you follow economic news, [...]
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The CE Code, Part I governs installation of various electrical equipment. A fire pump is certainly also covered by the Code requirements. But in addition to the CEC, Part I, this type of electrical equipment must meet provisions of other important documents. Let’s check out these additional requirements. Our first stop is the scope of [...]
(No Ratings Yet)In the home In the wake of this year’s disastrous hurricane season, the International Association of Electrical Inspectors (IAEI) and Underwriters Laboratories Inc. (UL) are offering useful information and guidance to homeowners about the dangers present when water comes in contact with electricity. A new brochure, “When disaster strikes … electrical safety in your flood-damaged [...]
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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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