Has UL investigated the effects of spray-on foam insulation on Type NM cable jackets or individual conductor insulation?
(No Ratings Yet)
In the early 1970s, a new form of cable tray was introduced to the European market. Wire mesh basket tray promised savings in both materials and labor and gained considerable success in Europe through the mid-1990s when the concept was exported to the United States. The introduction of basket tray to the U. S. was [...]
(4 votes, average: 4.25 out of 5)Question Is all Type PLTC cable sunlight-resistant or is it sunlight-resistant only if marked? Is it evaluated for use in wet locations?
(No Ratings Yet)
This article deals with abandoned, low-voltage communications cabling in building structures, and the serious fire hazard concerns that prompted the 2002 National Electrical Code to require the removal of abandoned cable. The article was written with the goal of encouraging electrical inspectors and other AHJs to enforce code compliance. In just the past 12 months [...]
(1 votes, average: 5.00 out of 5)
The use of fine stranded, flexible cables appears to be increasing each year. This is particularly true with relatively “young” industries like the photovoltaic (PV) industry, the fuel cell industry, and the uninterruptible power supply (UPS) industries. In many cases, technicians and installers in these fields prefer to use fine-stranded flexible cables in the larger [...]
(1 votes, average: 5.00 out of 5)
Heat is one of the enemies of electrical systems. As part of a larger study of elevated ambient temperatures in residential and non-residential structures in Las Vegas, Nevada, two experiments were carried out that would seem to require some action in the National Electrical Code. They involve 1) bundled cable normally found above a load [...]
(1 votes, average: 3.00 out of 5)
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 [...]
(No Ratings Yet)
There have been numerous inquiries to my office about the requirement of increased clearances for combustible sleeving and electrode boots from conductive and combustible materials, (which equates to everything) when used with high voltage GTO cables and terminations. The growing necessity to increase the clearance requirements has brought changes to Section 34 (high voltage sign [...]
(No Ratings Yet)
Type Metal Clad Cable (MC) is being installed in virtually every type of building under construction today including stadiums, schools, multi-family housing, hotels, commercial retail and office, industrial plants and warehouses along with many other facilities. This article addresses the interlocked armor Type MC cable with conductors No. 8 CU and No. 6 AL and [...]
(No Ratings Yet)
The IAEI/UL Technical Advisory Panel (TAP) was established in 1997 to address several technical issues that require research. One of the first actions of the TAP was to assign a Task Group to review the grounding provided by metal raceway systems described in NEC Section 250-118 [previously Section 250-91(b)], and focus on the use of [...]
(No Ratings Yet)
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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