There are a variety of technologies and methods used to test the insulation of wire and cable, including high-potting, very low frequency (VLF), power factor, partial discharge, time-domain reflectometry (TDR), and “thumping.” Like a visit to the doctor’s office, each test examines the test item in a different way and looks for a different response [...]
(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: UL Listed Cable with Conflicted Ratings I have encountered some UL Listed cable with conflicting ratings marked on the cable and I am not sure how to interpret it. Can Listed cable have dual ratings such as Type TC, 600V, direct burial cable that is also marked NPLF 150V? If so, can I use [...]
(No Ratings Yet)
Protection Required There’s a lot of talk about protection going on currently. Personal protection, internet protection, home protection, neighborhood protection… the list goes on and on. Because results of a recent IAEI members survey show interest in more basic code training, this article will focus on a basic but essential requirement for most any electrical [...]
(1 votes, average: 4.00 out of 5)
When inspectors see a photovoltaic (PV) power system for the first time, they will usually be faced with a type of wiring method not normally seen in residential or commercial electrical systems. That wiring method is the use of single-conductor exposed cables to connect the individual PV modules together in the PV array and is [...]
(No Ratings Yet)In my experience, a discussion of conductor numbers and ampacities in cable trays is frequently met with a snicker or knowing smile. Could it be that the rule for wiring in cable trays is sometimes taken less than seriously? We have all seen trays overloaded with cables, if not at the time of installation, then [...]
(No Ratings Yet)
The traditional distinction between MC and AC cable applications is changing because of a new interlocked armor ground Type MC cable. In the last few years, contractors have been using Type MC cable for branch circuits because of the installed-cost savings MC delivers. Now, a new form of Type MC —MCAP™ cable — promises to [...]
(No Ratings Yet)
The world’s population, although greater than ever, is also more connected than ever. We are linked by satellite, Internet, fiber optic cables, and high tech communication cords. We transmit data and power in fractions of seconds, often not giving a moment’s thought about the sophisticated technologies that allow these transmissions to take place. Many of [...]
(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)
So sayeth the inspector when faced with inspecting his or her first rooftop residential or commercial PV installation. Yes, PV systems have some unusual wiring methods allowed by the Code. However, since all of the usual wiring methods found in chapter 3 of the Code also apply, the inspector must sort through what is allowed [...]
(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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