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, [...]
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NEC AND FIELD PROBLEM 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 [...]
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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 [...]
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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. New homes are getting bigger and bigger, and a wider variety of electrical products are being installed in these homes [...]
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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. Unique [...]
(No Ratings Yet)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 [...]
(No Ratings Yet)Question: Portable power distribution unit What UL Standard is used to evaluate portable power distribution units used at construction sites? How can I identify these products?
(No Ratings Yet)Question: Ground-fault circuit interrupter (GFCI) Did UL change the requirements for ground-fault circuit interrupters (GFCIs)?
(No Ratings Yet)Question: Manufactured wiring systems How is a user to know how to install Listed “manufactured wiring systems” and how are they labeled?
(No Ratings Yet)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. Rule 14-100 begins by stating the obvious — that [...]
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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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