October 6, 2017 — Rules in Section 16 (New 16-300 series added) of the upcoming CE Code 2018 have been amended to include requirements for Class 2 power and datacom circuits. Although the new requirements do not reference “Power-over-Ethernet” (PoE) terminology, an Appendix B Note is added to explain the “Class 2 power and data communication circuit” is based on the concept known as PoE, introduced by the IEEE 802.3 series of standards.
September 15, 2017 — In addition to a number of changes in 2012, CE Code Section 62 “Fixed electric heating systems” underwent a fairly substantial rewrite in 2015. So what’s changed?
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.
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.
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.
NEMRA Annual Conference 2018
January 31-3, 2018
Electrical Inspectors Assoc. of Alberta 2018 annual conference
February 2-3, 2018
NAILD Innovation Conference 2018
February 13-16, 2018