NEC Training: Going Above and beyond

Staying apprised of the myriad of Code changes cycle after cycle is a daunting and necessary task for any contractor, his employees, and their...

What Is Earthing & Why and How Do We Connect to...

The thin layer of material which covers our planet—rock, clay, chalk or whatever—is what we in the world of electricity refer to as earth. So, why do we need to connect anything to it? After all, it is not as if earth is a good conductor. It might be wise at this stage to investigate potential difference (PD). A PD is exactly what it says it is: a difference in potential (volts). In this way, two conductors having PDs of, say, 20 and 26 V have a PD between them of 26 and 20 V. The original PDs (i.e., 20 and 26 V) are the PDs between 20 V and 0 V and 26 V and 0 V.

Medium Voltage Earthing Systems – Arrangements and Comparison

Neutral point connection method First, let’s define the different medium voltage earthing systems and then compare the advantages and disadvantages of each one. Earthing systems...

Rules 4-004 and 12-2210 — Intricacies of Application

The Code users quite often express concerns on perceived inconsistency between these two Rules, particularly in light of the changes to Rule 4-004 for...

Nooks and Crannies in PV Systems Where the Code “Don’t Shine”

The National Electrical Code published by the National Fire Protection Association covers numerous subjects relating to the installation of electrical systems including the installation...

UL Question Corner — Self-testing GFCI Requirements

Question I’ve heard GFCIs are now required to have a self-test feature. What is the new GFCIs self-test feature all about?  What does it do...

Chapter 5 Highlights for the Combination Inspectors

Chapter 5 covers Special Occupancies, including areas such as hazardous locations, medical facilities, carnivals, mobile home parks, and more. The difficulty with enforcing chapter...

Lead from need: 4 Ways to Motivate your Members

His quarterly reports are in, and Scott is clearly alarmed. Unless next quarter’s goals are met, the Governance Committee will ask for his resignation....

CODE HUNTER — Voltage, 2014 NEC

To play this game, you need a sharp eye, a quick mind and a 2014 National Electrical Code book. (Fill-in-the-blank questions are looking for...

Are the Electrical Safety Codes under Fire?

If I told you a group across the United States and Canada is lobbying to remove requirements pertaining to proven life safety devices from...