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Monthly Archives: July 2015

Article 450 Transformers

As inspectors who are required to perform inspections in a wide variety of construction projects, we frequently see customer-owned transformers installed in larger projects....

Welcome Guide for the Proper Electrical Inspection of LED Signage

In many applications, LEDs are replacing neon as a light source for signs, causing confusion as to what is required by the NEC. Using...

UL Question Corner — PV Rapid Shutdown Systems

The 2014 NEC 690.12 requires rapid shutdown of photovoltaic (PV) systems on buildings and that equipment that performs the rapid shutdown be listed (certified)...

“It’s okay to look back at the past. Just don’t stare.”

IAEI’s Commitment to You: The bursting of the housing bubble in mid-2007 and the severe recession that followed caused many not-for-profit membership organizations that...

NEMA Publishes Polyvinyl Chloride (PVC) Fittings for Use with Rigid PVC Conduit and...

ROSSLYN, Va., July 14, 2015 — The National Electrical Manufacturers Association (NEMA) published NEMA Polyvinyl Chloride (PVC) Fittings for Use with Rigid PVC Conduit...

Highlights of NEC Articles 422, 430, and 440

As we continue our journey through Chapter 4 in the 2011 National Electrical Code, I will point out highlights in the material that I...

ESFI Addresses Hazards in Older Homes during National Electrical Safety Month

The National Fire Protection Association estimates that an average of 47,820 home electrical fires occur each year. These fires result in 455 civilian deaths, 1,518...

Calculating Short-Circuit Current

One of the most fundamental calculations made on a power distribution system is that which yields available short-circuit current. The September – October 2012...

Protection of Electrical Conductors Against Exposure to Fire — Reality and Misconceptions

Although I wrote an article on this subject just more than a year ago, I have received a few e-mails with questions from the...

Keeping Up to Speed: Education and Training for the Inspector

The technologies of high-speed computers, microprocessors and integrated circuits are causing a continual evolution and even a revolution in many devices that are installed...
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