Code File
August 17, 2017 - The new CE Code (25th ed.) is almost here, and Section 64 contains several important changes (already approved by the CE Code-Part I Committee), two of which I will discuss here.
June 28, 2017 - What do circuit loading and demand factors mean, and how are they different? A circuit load is a component or portion of the circuit that consumes power. A demand factor is a time-dependent fractional quantity that will always be less than, or equal to, one. Huh?
May 26, 2017 - Required by the National Building Code (NBC), smoke alarms must be permanently connected to a lighting circuit, or one that supplies both lighting and receptacles, so as to quickly detect when there’s a problem with the circuit.
April 10, 2017 - The 3rd Memorandum of Revision (MOR) is out, and Rule 8-104 is undergoing some significant changes. Subrule (8) has been deleted from the CE Code, and 8-104(5) and (6) have been rewritten. What does this mean for calculating cable sizes used in direct burial installations?
March 14, 2017 - As the name suggests, energy storage systems (ESSs) are mechanisms capable of storing energy for use at a future time.
February 14, 2017 - Believe it or not, it’s that time of year when firms start looking ahead to the camping season and campground upgrades. Nothing much has changed in recreational vehicle parks over the past CE Code cycle, but a number of changes took place over the past 15 years to make this part of the code clearer.
January 18, 2017 - Ground fault protection (GFP) requirements in the CE Code are often misunderstood; FAQs range anywhere from the very basic to complicated engineered schemes.
December 12, 2016 - An interactive power production system operates in conjunction with—and can deliver power to—another power system, such as the utility. While this could involve a standard generator, I will focus on renewable energy systems.
November 9, 2016 - The main purpose behind matching the conductor with the correct overcurrent protection is to safeguard the downstream conductor from overload and/or short circuit. Based on that simple concept, the rating of overcurrent protective devices (OCPD) always needs to be equal to or lower than the ampacity of the protected conductor.
October 11, 2016 - CE Code Section 10 “Grounding and bonding” talks of bonding metallic systems together to the grounding conductor. This reduces the danger of electric shock and property damage by providing a low impedance path for fault current back to the source, and establishes an equipotential plane, such that the possibility of a potential difference between metal parts is minimized.
September 12, 2016 - In 2013 I published a column very similar to this one to raise awareness about the hazards with delta (ungrounded) to wye (grounded) conversions. Delta systems have become increasingly less common—many of the experts on these systems have retired and lessons learned have been forgotten.
August 10, 2016 - The building code defines a vapour barrier as “the elements installed to control the diffusion of water vapour”. Did you notice it says “control” not “eliminate”?
July 7, 2016 - Equipment marking contributes to the safety of electrical installations by identifying switches and breakers so that circuits can be de-energized, allowing for the timely and accurate identification of circuits so that loads are not inadvertently de-energized; and providing workers with the means to de-energize circuits more conveniently, reducing the likelihood that a worker will engage in unsafe work practices.

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