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Continuing decreases in the cost of photovoltaic (PV) power systems have resulted in residential and commercial PV systems that are increasing in size and power output. The lead-in photo shows a condo community with PV covering nearly all available roof area; and yes, pointing in several different directions. These larger systems are frequently too large to be connected on...
This article is the result of numerous questions raised by the electrical designers, electrical contractors and even electrical inspectors on the subject at hand. When a design and installation apply to a new construction, it is quite clear that all relevant provisions of the legally adopted codes (i.e., of the National Building Code of Canada – NBCC, and the...
The popular and frequently referenced Model Inspection Checklist for Rooftop PV is now updated and expanded to include the latest national and international codes and safety insight for the rapidly expanding solar industry. Created by the independent Interstate Renewable Energy Council (IREC), the resource provides basic guidelines for reviewing a building permit plan application and inspecting most residential rooftop PV systems. In...
Last year, the Electrical Safety Foundation International (ESFI) conducted a survey of electrical designers, planners, and engineers who design or renovate systems in industrial facilities, healthcare facilities, and IT centers. In response to the survey results, which demonstrated a limited or misinformed understanding of surge protection devices (SPDs), ESFI has created educational materials to spread awareness of the purpose...
Sheikh Mohamed bin Zayed Al Nahyan, Crown Prince of Abu Dhabi and Deputy Supreme Commander of the UAE Armed Forces, on January 17, presented the Lifetime Achievement Award of the 2018 Zayed Future Energy Prize to Shuji Nakamura, Professor of Materials and Electrical & Computer Engineering at the University of California and Co-Director of the Solid State Lighting &...
A new member is first a customer who needs to be attracted, wooed and sold on the organization. This process is extremely valuable and crucial to meeting his or her expectations.  The following five steps have been proven effective. 1. Try something new In their “Habits Across the Lifespan” study, Duke University researchers found that nearly half of human behaviors are...
This is the third of a series of five articles detailing significant changes approved by the Technical Committee for the 2018 Canadian Electrical Code Part I (CE Code). The final meeting for 2018 CE Code changes took place in June 2017. It should be noted that the 2018 CE Code was published by CSA Group on January 1, 2018,...
I find inspecting the wiring and branch circuit protection of a three phase to three phase VFD used in a single phase to three phase motor application confusing. The manufacturer’s instructions state the drive output rating should be sized twice the rating of the motor. Can UL shed some light on sizing of conductors and branch-circuit protective devices required...
Underscoring these concerns is a new NFPA Fire & Life Safety Policy Institute report, “Falling Behind on Electrical Safety,” that includes a review of state practices and interviews with industry professionals.
The Electrical Safety Foundation International (ESFI) uses the U.S. Bureau of Labor Statistics’ (BLS) Census of Fatal Occupational Injuries (CFOI) and Survey of Occupational Injuries (SOII) to distill information specifically pertaining to fatal and nonfatal occupational electrical injuries. Each year the ESFI publishes electrical injury information in tabular and graphical form on our website. The most recent data covers...
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