With the advent of power over ethernet in the 2017 National Electrical Code (NEC) , in Article 393 of the 2014 NEC covering low-voltage ceiling grid power, and other applications dealing with power-limited circuits, there...
This column completes last month’s discussion on the history of working space requirements in the National Electrical Code (NEC) . Now, it is time to look to the more recent past and even into the future. 2002 Code Section...
Around 2007, the National Institute for Occupational Safety and Health (NIOSH) introduced a concept known as prevention through design (PtD), which addresses preventing and controlling occupational injuries, illnesses and...
Let’s assume a 120/208-volt (V), three-phase service was installed on a building a few years ago and the new owner of the building needs a standby generator for use during power outages. The electrical contractor installs a...
“Installation approved!” It’s what those involved in construction strive for as they build their projects. Obtaining approvals involves multiple steps, many of which are related to the communication and relation with...
The words in this headline opened every episode of the original Star Trek, along with some of the movies. Lately, when I hear those words, I think of Section 110.26 of the National Electrical Code (NEC) . Space in buildings...
This article begins a series in which I dive deep into the details of the newly published 2018 Edition of IEEE 1584—IEEE Guide for performing Arc-Flash Hazard Calculations. This standard is used globally for calculating the...
Jim Dollard has an extensive background in codes and standards. If you have a query about the National Electrical Code (NEC) , Jim will help you solve it. Send questions to codefaqs@gmail.com . Answers are based on the 2017...
Jim Dollard has an extensive background in codes and standards. If you have a query about the National Electrical Code (NEC) , Jim will help you solve it. Send questions to codefaqs@gmail.com . Answers are based on the 2017...
National Electrical Code (NEC) Panel 3 established the new Article 728 in the 2014 NEC. It deals with fire-resistive cabling systems, and it was marginally revised for the 2017 NEC . The article covers the installation of...
Article 430 in the National Electrical Code (NEC) is titled “Motors, Motor Circuits and Controllers.” As the scope of the article states, it covers motors, motor branch-circuit and feeder conductors, motor branch-circuit and...
Ground-fault protection of equipment (GFPE) protects large equipment from devastating arcing events and destructive burn-downs. GFPE requirements are provided in sections 210.13, 215.10, 230.95, 240.13 and 517.17, to name a...
Jim Dollard has an extensive background in codes and standards. If you have a query about the National Electrical Code (NEC) , Jim will help you solve it. Send questions to codefaqs@gmail.com . Answers are based on the 2017...
I have always been fascinated by cables and conductors—sometimes referred to as wires in the National Electrical Code (NEC) and other standards—and the insulation for these cables and conductors, as well as their multiple...
As stated in 240.4 in the National Electrical Code (NEC), conductors, other than flexible cords, flexible cables and fixture wires, shall be protected against overcurrent in accordance with their ampacities specified in 310...
Emergency systems, legally required standby systems and optional standby systems are often supplied by generators as the standby source if the normal (utility) source is interrupted. Emergency and legally required standby...
Jim Dollard has an extensive background in codes and standards. If you have a query about the National Electrical Code (NEC), Jim will help you solve it. Send questions to codefaqs@gmail.com . Answers are based on the 2017...
Article 430 in the National Electrical Code (NEC) covers motors, motor branch-circuit and feeder conductors and their protection, motor overload protection, motor control circuits, motor controllers, and motor control centers...
I have written a couple of articles about NFPA 4, Standard for Integrated Fire Protection and Life Safety System Testing, in the past. The last one in December was about getting it referenced in the model codes to make its...
The National Electrical Safety Code (NESC) is published by the Institute of Electrical and Electronics Engineers (IEEE). The latest edition is designated as ANSI C2 2017. This article examines the basics of the NESC relative...
