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Monthly Archives: November 2015

O Disconnect, Disconnect, wherefore art thou Disconnect?

Somewhat like Juliette looking for Romeo, PV installers and a few inspectors have trouble looking for, finding, and interpreting the numerous disconnect requirements in...

CODE HUNTER — Listing, 2014 NEC

Questions 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 the...

Making Changes to the Canadian Electrical Code

The Canadian Electrical Code consists of five parts. Part I covers the installation and maintenance of electrical equipment, Part II is the safety standards...

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 it?

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...

UL Question Corner: Rebuilt Equipment

If a UL Listed (Certified) product is rebuilt, reconditioned, refurbished or remanufactured, does the original Listing (certification) mark on the product apply to the...

2015 Section Meetings

As summer ended, days became cooler, and students settled into school, the IAEI Sections Meetings swept across North America. For me, IAEI Section meetings afford...
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