May-June 2014
THOMAS A. DOMITROVICH

NEC and Worker Safety

More from the Magazine


In my jurisdiction, we provide electrical inspection training for our combination inspectors twice a month (along with mechanical/plumbing and building code). The ongoing joke among the electrical designers and installers in the area is that the training material is obvious because the correction notices will suddenly reflect the subject of the recent class. Not a bad criticism, I suppose, in that it means people are paying attention and applying what is taught. But the joke reflects a reality that can be counterproductive. Read more


There is new Rule (4-006) in Canadian Electrical Code 2012 (CEC 2012), with requirements to consider maximum equipment termination temperature in determining the conductor ampacity. This new rule is introduced as part of the conductors’ ampacity harmonization between USA (National Electrical Code – NEC) and Canada (CEC). Read more 


In the last article, we discussed cable wiring methods. Continuing in Chapter 3, we find ourselves considering the various raceway systems used in electrical installations. We will be covering the various raceway Articles from 342 to 362, and we are still using the 2011 National Electrical Code. Again, we will be discussing just those articles that are commonly used in combination electrical inspections. Read more 



Over the past decade, U.S. seizures of counterfeit products have increased more than 325%. Consumer electronics, with a value of almost $40 million, were the top commodity seized in 2011. Counterfeit products can unknowingly be used in manufacturing, military, critical infrastructure, and consumer product applications. They not only endanger the economic health of the nation, but more importantly, put the safety of our families, communities, and employees at risk.  Read more 



This is the first of three articles detailing significant changes for the 2015 Canadian Electrical Code Part I (CE Code). The final meeting for 2015 CE Code changes is scheduled for June of this year. The rules in this article are limited to changes already adopted by CE Code Technical Committee and are not subject to further changes.  Read more 



Apparently, we do. And there are numerous bits of information published on this subject that create further confusion. One such piece is published in this journal. It explains alternatives to the application of Rule 4-006 by using correction factors of Section 4. This referenced article also states that the ESA “Bulletin 4-12 permits and clarifies this alternative approach” to Rule 4-006.  Read more



The exposed cables and connectors used in PV source circuits are some of the most critical components of a PV system in terms of maintaining system durability and safety. These components are exposed to the extremes of weather for the life of the system and may be required to be durable and safe longer than the system will actually produce power. PV modules have a warranted life span for power output of 25 years, but they may produce dangerous amounts of voltage and current for as long as 40 or 50 years. And, in many cases there will be a functioning or more likely nonfunctioning inverter attached to that PV array output for that length of time. The quality of the components used and the care taken in complying with the code determine the durability and ultimate safety of these cables and connectors.  Read more 



The decision on which grounding system to employ has a direct and quantifiable impact on electrical safety and reliability. As the table below indicates, high resistance grounding is the superior choice as it provides process continuity even under a single fault condition, it limits destructive transient over-voltages, it empowers the user to locate the fault, quickly and safely, and it reduces the arc flash hazard.  Read more



The 2014 National Electrical Code contains numerous changes that affect wire and cable installations. This article will cover a few of the highlights, discuss why the changes were made, and explain what they mean for code users.  Read more



Selective coordination has been required for multiple elevators, supplied from a single feeder, since the 1993 National Electrical Code (NEC®). This requirement was based on a similar requirement in the Canadian Electrical Code. In the 2005 NEC, requirements for selective coordination were added to 700.27 for emergency (700.28 in 2014 NEC) and 701.18 for legally required standby systems (701.27 in the 2014 NEC). These requirements additionally applied to essential electrical systems in healthcare facilities, since these systems were required to follow the requirements of emergency systems. Read more 



It’s about that time again - the adoption of a new National Electrical Code (NEC) cycle inevitably looms over many an Authority Having Jurisdiction. Looking at the hundreds of changes in the 2014 NEC, I have picked out a handful of what I call the “Top 10 Electrical Code Changes.” It is important to remember that all code changes are important, and in no way are these particular changes more or less important than any others. I have listed what I personally believe to be ten changes that will, let’s say, cause the most discussion. Read more 



This subject has been already discussed in one of my previous articles. However, confusion on this issue does not appear to subside among the electrical designers, and it is appropriate to re-visit this subject again from the perspective of the Canadian Electrical Code, Part I.  Read more 



May is National Electrical Safety Month, a time when an increased awareness is placed on electrical safety both in the workplace and at home. The use of electricity has changed and will continue to change our quality of life. We become aware on how much we rely on electricity when we experience a power outage Read more 



How do we know who has Listing (certification) for a product category in the White Book?What is the latest on fire-resistive cables certified by UL? Read more 



Download the Chapter and Division minutes from the IAEI May-June 2014 issue. Read more

 

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